TSP 15k is suitable for passenger car axles. Transmission oil. Competitors and international recognition

→ TSP-15k (TM-3-18)

Transmission oil TSP-15K (TM-3-18)

TSP oil is the residual oil that is obtained by adding a small amount of distillate filler. Also, a complex of additives is added to TSP-15K oil, which have a beneficial effect on its properties and enhance the effect and efficiency. Additives affect the extreme pressure, low temperature, antiwear and antifoam properties of this oil, making it versatile for its application.

Applications of transmission oil TSP-15K (TM-3-18)

The main field of application of this oil is the gearbox and final drive, which have a two-stage gearbox with cylindrical spiral bevel gears. Most often, such components and assemblies are found in the structure of the KAMAZ vehicle and other trucks for various purposes. Butter TSP 15K maintains performance at temperatures from -20 degrees Celsius to +130 degrees. The duration of work under such conditions is quite significant.

It must be added that this oil is used in large quantities. trucks Therefore, the demand for it is constantly high. The features of this oil are that it is perfect for the specifics of the aggregate connections of trucks.

The Ural-Kub company offers its customers to purchase TSP-15K (TM-3-18) oil with the following packaging forms:

- in a metal barrel with a volume of 216.5 liters

- in a polyethylene barrel with a volume of 227 liters

– in eurocanisters with a volume of 5, 10, 20, 50 liters

- in any container of the client at will

We are one of the leading companies in the sale of fuels and lubricants different types and classes, so all our products meet the basic requirements, are reliable and of high quality.

Transmission oil TSP-15K meets the requirements of GOST 23652-79

How to buy oil TSP-15K (TM-3-18)

Specifications TSP-15K ( TM-3-18)

Name of indicator		Norm according to GOST ( THAT)
Density at 20°С, g/cu. cm, no more		0,910
Kinematic viscosity, sq. mm/s:
	at 100°C	14,0-16,0
Viscosity index, not less than		90
Dynamic viscosity, Pa-s, at -20°C, no more		75
Mass fraction, %, no more:
	mechanical impurities	0,01
	water	footprints
Temperature, °C:
	flashes in an open crucible, not below	191
	solidification, not higher	-25
Corrosion test for 3 hours on copper plates at 120°С, points, no more		2s
Thermal-oxidative stability on the DK-NAMI instrument at 140°С for 20 h:
	increase in viscosity at 100°С, % max	7
	sediment in petroleum ether, % max	0,05
Tendency to foaming, cub. cm, no more:
	at 24°С	300
	at 94°C	50
	at 24°C after testing at 94°C	300
Tribological characteristics on a four-ball friction machine:
	bully index, N, not less than	539
3479
	wear rate at 20°C for 1 hour and axial load 392 N, mm, max	0,5
Compatibility with rubber brand UIM ( volume change), %		1-8

TSP-15k oil is a popular transmission fluid actively used for vehicles. Its production history has been known since Soviet times, and the quality criteria, rating, recognition and prevalence have not decreased to today. Its production began from the Kama Automobile Plant with a purposeful purpose to increase the operation of KamAZ transmission units, however, today this lubricant is produced by different manufacturers, and its scope has become much more extensive. In this article, we will study the composition and, its purpose and possible applications, we will talk about the most famous manufacturers of the product, analogues of foreign-made goods.

Transmission oil TSP-15 is made from a sulfur-containing oil product.

Oil composition

Transmission oil TSP-15 belongs to the category of mineral lubricants. The production process is based on the purification, separation and processing of oil with a huge capacity of sulfur-containing ingredients. As a result of processing, a lubricant is obtained based on residual substances with distillate impurities. The main active ingredient of the oil is sulfur, which increases the anti-friction characteristics of the product, which significantly affects its ability to counteract the negative effects of the friction process, which is typical for transmission parts. In addition, component additives are added to the oil to improve the quality of the product, increase anti-corrosion and anti-foam properties.

Specifications

Transmission oil TSP is manufactured in accordance with GOST 23652-79, according to SAE it is marked 80W-90, it is classified as a TM-3 product category and is identified by the code TM-3-18. The grease has the following basic technological characteristics:

1. According to the production technology, at an operating temperature of one hundred degrees Celsius is fifteen units, while the variable viscosity of TSP-15k oil at a temperature of minus twenty degrees should fluctuate up to seventy-five points.
2. The density of TSP-15k oil does not exceed nine hundred and ten units.
3. The operating temperature range varies from twenty degrees with minus to one hundred and thirty plus. At the same time, the lubricant solidifies at a temperature not exceeding twenty degrees below zero, and the temperature criteria for ignition are not less than two hundred and forty degrees.
4. The scuff coefficient, according to production standards, is at least five hundred and forty units, the tendency to foaming does not exceed three hundred in working condition.
5. The mass fraction of water should not be determined, only its traces in the composition are possible, and mechanical impurities, according to the standard, do not exceed a hundredth of a percent.

TSP-15k, according to technical criteria, can be attributed to multi-purpose lubricants, it is allowed to use on vehicles in any season. The service life of the oil ranges from thirty-six to seventy-two thousand kilometers, depending on external and internal factors.

Application area

Initially, the range of application of TSP oil was limited to cargo KamAZ vehicles, while it was recommended for use both in the main gear and for filling into transmission units. Today, the TSP-15k lubricant application sector is much more extensive. TSP oil can be used in any type of freight transport with spiral-bevel and cylindrical gears. It is actively used to lubricate units and assemblies of agricultural machinery, construction machines and tractors. The use of lubricant is recommended for all types of transport, the technical documentation for which provides for the filling of liquid class TM-3.

What is hidden in the title?

TSP-15 oil is included in the category of oils with the identifier TM-3. What does its name mean? Based on the technical documentation, the marking "TSP-15k" is interpreted as follows:

1. The letter "T" is an abbreviation for the word "transmission".
2. The symbol "C" indicates the manufacture of goods from a sulfur-containing oil product.
3. The letter "P" states the presence of additives in the product, which ensure the wear resistance of machined structures and guarantee the quality of the oil.
4. The number 15 indicates the viscosity coefficient of the lubricant.
5. The symbol "k" stands for vector standardization of products, or rather, the sectoral purpose of oil for technical units of KamAZ trucks.

Previously, when there was one plant producing oil in this category, it was simply called TSP-15k. Today, several large manufacturers of lubricants and a lot of small firms are engaged in its manufacture. To distinguish their oil from similar products, large factories often prescribe the name of the company before labeling. When choosing an oil, the orientation for the buyer should first of all be the marking of the goods, which characterizes its technical features, and then the orientation to the manufacturer.

Competitors and international recognition

Today, Lukoil is considered the most popular manufacturer of TSP-15k oil, however, it is not a monopolist in this field of activity. Lukoil's biggest rivals are Rosneft. Transmission oil of the TSP-15k category is also produced by many small factories, the most active among which are the Zarechye and Necton Sea concerns, as well as numerous regional suppliers.

Among other things, TSP-15 oil, according to API classification, complies with GL-3 standardization, recognized throughout the world. Lubricants are manufactured according to the same standards for trucks overseas manufacturers. The most popular imported analogues of TSP 15 lubricating fluid: Shell, SpiraxEP 90W Mobil, Gear oil EP 90 and others. Availability of analogues on international market speaks of the high competitiveness of the domestic TSP fluid, confirms its demand in the industrial sector. Despite the strict control of the foreign market by its manufacturers, TSP-15 is successfully exported abroad and has its own buyer.

Summing up

TSP oil is recognized not only by the domestic consumer, but is also ranked among those recognized throughout the world. Its qualitative characteristics have proven their effective influence on the performance properties of transmission structures, provided that the products are used in the respective climatic regions. Priority should be given to oils that are sold at points of sale that have certification documents for the goods sold. This is the only way the buyer will be able to protect himself from purchasing low-quality lubricants that do not meet GOST standards, and, accordingly, the declared characteristics.

GOST 23652-79

INTERSTATE STANDARD

TRANSMISSION OILS

TECHNICAL CONDITIONS

Introduction date 01.01.81

This standard applies to petroleum gear oils intended for lubrication of transmission units (cars, tractors, diesel locomotives, agricultural, road and construction machines) and gear reducers.

This standard does not apply to thickened gear oils.

Mandatory requirements for product quality are set out in paragraphs and sec. , .

(Changed edition, Rev. No. 4, 5, 8).

1. STAMPS

Depending on the viscosity, application and composition, the following grades of gear oils are established:

TEP-15 - produced on the basis of extracts of residual and distillate oils with antiwear and depressant additives and used for lubrication of cylindrical, bevel and spiral-bevel gears;

ТSp-10 - manufactured by mixing the deasphalted oil from Emben oils with a low-viscosity low-hardening distillate component, containing extreme pressure, depressant and anti-foam additives and used for lubrication of heavily loaded cylindrical, bevel and spiral-bevel gears;

TAp-15V - made from a mixture of extracts of phenol-refined residual oils and distillate oils or paraffin deoiling filtrate, containing extreme pressure and depressant additives and used for lubricating heavily loaded cylindrical, bevel and spiral-bevel gears;

TSp-15K - made from a mixture of distillate and residual oils of sour oils, containing extreme pressure, antiwear, depressant and antifoam additives and used to lubricate heavily loaded spur, bevel and spiral bevel gears of heavy trucks KAMAZ;

ТSp-14 hyp - made from a mixture of residual and distillate components of sour oils, containing extreme pressure, antioxidant, depressant and antifoam additives and used for hypoid gears of trucks;

TAD-17i is a universal, mineral-based, containing multifunctional sulfur-phosphorus-containing, depressant and anti-foam additives and is used for lubricating cylindrical, bevel, worm, spiral-bevel and hypoid gears of VAZ vehicles and other equipment.

Compliance of the oil grades established by the standard with the previously adopted GOST 17479.2 and oil grades according to foreign classifications, as well as the temperature ranges of oils, are given in the appendices and.

Sec. one. (Changed edition, Rev. No. 3, 5).

2. TECHNICAL REQUIREMENTS

2.1. Gear oils must be manufactured in accordance with the requirements of this technology standard, from raw materials and components used in the manufacture of oil samples that have passed tests with positive results and are approved for use in the prescribed manner.

2.2. In terms of physical and chemical parameters, gear oils must comply with the requirements and standards specified in the table.

Name indicator	Norm for the brand						Method tests
	TEP-15 OKP 02 5362 0100	TSp-10 OKP 02 5363 0100	TSp-15K OKP 02 5363 0300	TAp-15V OKP 02 5363 0200	TSp-14 gyp OKP 02 5363 0400	TAD-17i OKP 02 5364 0600
1. Density at 20 °С, g/cm3, no more	0,950	0,915	0,910	0,930	0,910	0,907
2. Kinematic viscosity, mm 2 / s (cSt):
at 100 °С	15.0±1			15.0±1
at least		10,0	15.0±1		14,0	17,5
at 50 °C						110 - 120
3. Dynamic viscosity, Pas (P), no more, at temperature:
6. Pour point, °С, not higher
7. Mass fraction of mechanical impurities,%, no more	0,03	0,02	0,01	0,03	0,01	Absence
11. Acid number, mg KOH per 1 g of oil, no more
12. Mass fraction of active elements due to additives, %, not less than:
phosphorus	0,06
chlorine
sulfur	No more than 3.0			Not standardized. Definition required		1,9 - 2,3
13. Thermal-oxidative stability, %, not more than:
increase in viscosity at 50 °C
residue in petroleum ether
sediment in gasoline
b) on a DK-NAMI device at 140 °C for 20 hours:
increase in viscosity at 100 °C	25,0	27,0
residue in petroleum ether			0,05
14. Tendency to foaming, cm3, not more than:
at 24 °C
at 94 °C
at 24°C after testing at 94°C
15. Tribological characteristics on a four-ball machine:
bully index (I 3), N (kgf), not less than
		470,4				568,4
		(48)	(55)	(50)	(60)	(58)
welding load (R s), N (kgf), not less than		3479	3479	3283	3920	3687
		(355)	(355)	(335)	(400)	(376)
wear index (D and) at axial load 392 N (40 kgf) at (20 ± 5) °С, for 1 hour, mm, no more	0,55		0,50			0,40
16. Compatibility with UIM-1 rubber (volume change), %	4 - 10		1 - 8	4 - 10		1 - 6
	Absence			Absence
19. (Deleted, Rev. No. 2).
20. Coking capacity, %, no more

Notes :

1. (Deleted, Rev. No. 2).

2. (Deleted, Rev. No. 5).

3. Sand and other abrasive substances are not allowed in mechanical impurities.

5-7. (Deleted, Rev. No. 7).

8.(Deleted, Rev. No. 3).

9. The rate of sediment in petroleum ether (indicator 136) for TEP-15 brand oil, produced on the basis of an extract of phenol purification of residual oils from a mixture of West Siberian and Ural oils, is set to no more than 7.0%.

10. (Deleted, Rev. No. 4).

(Changed edition, Rev. No. 2, 3, 4, 5, 6, 7, 8).

3. SAFETY REQUIREMENTS

3.1. Gear oils are a flammable liquid with a flash point of 128 - 200 ºС.

3.2. In the room for storage and operation of oils, it is prohibited to use open fire, artificial lighting must be explosion-proof.

3.3. When opening the container, it is not allowed to use tools that give a spark when struck. When oil catches fire, the following fire extinguishing agents are used: sprayed water, foam; in case of volumetric quenching: carbon dioxide, composition of SFB, composition 3.5 and superheated steam.

3.4. According to the degree of impact on the human body, gear oils belong to the 4th hazard class according to GOST 12.1.007 with the maximum allowable concentration of hydrocarbon vapors in the air of the working area of ​​300 mg / m 3 and to the 3rd hazard class with the maximum allowable concentration of oil mist 5 mg / m 3.

(Revised edition, Rev. No. 6).

3.5. The room in which work with oils is carried out must be equipped with ventilation. When working with oils, it is necessary to use personal protective equipment in accordance with standard industry standards, approved by the USSR State Committee for Labor and social issues and the Presidium of the All-Union Central Council of Trade Unions.

3.6. When oil spills, it is necessary to collect it in a separate container, cover the spill with sand, and then remove it.

4. ACCEPTANCE RULES

4.3. Upon receipt of unsatisfactory test results for at least one of the indicators, repeated tests of a newly selected sample from the same sample are carried out.

The retest results apply to the entire lot.

Brush kapron (nylon).

Gasoline B-70.

Petroleum ether grade 70-100.

5.4.1.2. Preparing for the test

The walls and all parts of the box (except gears and bearings) are thoroughly cleaned with a brush, washed with B-70 gasoline and dried. Inspect the gears and bearing for damage, wash them with B-70 gasoline, and then with petroleum ether and dry. Grind the edges of the copper plate, then wash it, dry it and weigh it with an error of not more than 0.0002 g. Install the bearings, gears and the catalyst plate in the box. Close the box and pour 120 cm 3 of the test oil through the inlet tube.

Mark the time and turn on the motor. Set the output power of the generator 128 W and the air flow rate of 1 dm 3 /h. Heat the oil to 155 °C and maintain the temperature with an accuracy of ± 1 °C. After 30 minutes of operation of the machine, an oil sample (2 cm 3) is taken and the kinematic viscosity is determined at 50 ° C (GOST 33). Then oil samples for viscosity determination are taken every 10 hours of machine operation. At the end of the 50-hour test, the machine is stopped, the oil is poured into a clean flask or glass, and the viscosity is determined at 50 ° C and the amount of substances insoluble in petroleum ether and gasoline (separately), according to GOST 6370. Remove the gears and the copper plate, inspect them and describe the condition of the parts and components of the box, bearing gears and the copper plate. Remove deposits from the catalyst plate and weigh it to determine the activity of the oil in relation to copper.

5.4.1.4. Results processing

The increase in oil viscosity as it oxidizes (D v) as a percentage is calculated by the formula

where v- viscosity at 50 °C of oxidized oil, m / s (cSt);

v 0 - viscosity at 50 °C fresh oil, m / s (cSt).

The mass fraction in the oxidized oil of substances insoluble in petroleum ether and gasoline, ( X 0) as a percentage is calculated by the formula

where T - weight of the sample of oxidized oil, g;

T 1 - weight of a bottle with a clean filter, g;

T 2 - weight of weighing bottle with filter and insoluble substances, g.

The test result is taken as the arithmetic mean of two parallel determinations, the allowable discrepancies between which should not exceed 10% relative to the average determination result. The amount of insoluble substances less than 0.5% is estimated as their absence.

5.4.1 - 5.4.1.4. (Revised edition, Rev. No. 5).

(Revised edition, Rev. No. 7).

5.4.2.2. Results processing

Mass fraction of sediment in oxidized oil ( X os) as a percentage is calculated by the formula

where T 2 - weight of bottle with filter and sediment;

T 1 - weight of the bottle with a clean filter;

36.5 - weight of oil sample, g.

The test result is taken as the arithmetic mean of two parallel determinations, the allowable discrepancies between which should not exceed 10% relative to the average determination result.

The mass fraction of sediment in oxidized oil up to 0.02% inclusive is estimated as its absence.

5.5. Determination of the tendency of an oil to foam

The essence of the method is to blow a certain volume of air through the oil at a constant speed and determine the volume of foam.

Steel air inlet tube with a spherical diffuser with a diameter of 25.4 mm, made of molten crystalline grains of aluminum oxide.

Rubber plug with holes for air inlet and outlet tubes.

Rubber tubes with a diameter of (10 ± 1) mm.

Bathtub cylindrical from refractory glass with a diameter of 300 mm and a height of 450 mm.

Electric stirrer.

Microcompressor type MK-1 or other device that provides air supply at a speed of (94 ± 5) cm 3 /min.

A rheometer that controls the air flow. Thermometer with measuring range from 0 to 250 °С.

Stopwatch according to TU 25-1819.0021, TU 25-1894.003.

5.5.2. Preparing for the test

Thoroughly flush the cylinder, air inlet tube and diffuser alternately with gasoline and petroleum ether. Dry the cylinder, tube and diffuser with clean air. Air is fed through the drying filter, maintaining a speed of (94 ± 5) cm 3 /min.

5.5.3. Conducting a test

200 cm 3 of oil are heated to 45 - 50 ° C and cooled to 22 - 27 ° C. Pour 190 cm 3 of oil into the cylinder, immerse the cylinder in the bath to the mark of 900 cm 3 and maintain the temperature (24 ± 0.5) ° C. Insert a tube with a diffuser, turn on the microcompressor and pass a jet of air through the diffuser at a speed of (94 ± 5) cm 3 /min for 5 minutes, noting the time at the first appearance of air bubbles. After the specified time, the volume of foam is immediately recorded.

Then place 180 cm 3 of fresh oil in a clean cylinder, which is immersed in the bath to the mark of 900 cm 3, maintaining the temperature (93.5 ± 0.5) ° C. Repeat the same procedure as above and record the foam volume after 5 minutes.

Precipitate the foam, after testing at 94 °C, cool the foam with stirring, place in a cylinder, hold at (24 ± 0.5) °C and repeat the test, recording the volume of the foam after 5 minutes.

The tendency to foam is measured by the volume of foam in cm 3 formed after blowing air through the oil for 5 minutes at 24, 94 and 24 °C (after testing at 94 °C).

6.2. (Deleted, Rev. No. 7).

7. MANUFACTURER WARRANTY

7.1. The manufacturer guarantees the compliance of gear oils with the requirements of this standard, subject to the conditions of transportation and storage.

7.2. Guaranteed shelf life of oils is five years from the date of manufacture.

(Revised edition, Rev. No. 4).

ANNEX 1
Reference

Compliance of grades of gear oils according to this standard with the previously adopted
regulatory and technical documentation, foreign classifications andGOST 17479.2

Specification number and oil grade according to the previously adopted NTD	Oil grade		Viscosity class according to		Group by
	according to this standard
TU 38.101521-75 TE-15-EFO	TEP-15	TM-2-18			GI-2	TM-2
TU 38.101148-77 TS-10-OTP	TSp-10	TM-3-9			GI-3	TM-3
TU 38.101176-74 TAP-15V	TAP-15V	TM-3-18			GI-3	TM-3
TU 38.101753-79	TSp-15K	TM-3-18			GI-3	TM-3
TU 38.101270-78	TSp-14gip	TM-4-18			GOST 23652-79. Viscous oils are the most widely represented in the range of gear oils. Basically, gear oil is a low fraction mineral oil with an additive composition. The use of gear oils covers all trucks and cars, tractors, road construction machines and other types of equipment, as well as some types of heavy gearboxes. industrial equipment. These oils are combined by GOST 23652-79. Oil TEP 15 (GOST 23652-79) produced on the basis of residual products and distillate oils. The properties of the oil are improved due to the introduction of antiwear and depressant additives. This gear oil is used as a multigrade gear oil for tractors and other machines in temperate climates. Working temperature range of oil -20...+100 °С. Oil TSp 15K (GOST 23652-79)- gear oil, for gearboxes and main gears of domestically produced KAMAZ trucks, etc. It is a residual oil with a small distillate additive and a composition of additives that impart extreme pressure, antiwear, low temperature and antifoam properties. This gear oil is efficient at temperatures of -20...+130 °С. Oil TAP 15V (GOST 23652-79)- a mixture of a viscous product with distillate oil and a package of additives that impart extreme pressure and low temperature properties. This gear oil is used in transmissions of trucks and for lubrication of spur, spiral bevel and worm gears, in which contact stresses reach 2000 MPa, and the operating temperature of the oil is 130 °C. Oil TAD 17i (GOST 23652-79)- universal gear oil on a mineral basis. Contains depressant and antifoam additives. TAD-17 oil is used at temperatures up to -25 °C; the upper limit of long-term performance is 130-140 °C. Designed for lubrication of all types of gears. Specifications: Indicators TEP 15 TSp 15K TAp 15V Tsp 14gip TAJ 17i Viscosity: kinematic, mm2/s, at temperature: dynamic, Pa s, at -15 (-20) °С, no more Viscosity index, not less than Temperature, °C: flashes in an open crucible, not less than solidification, not higher Mass fraction, %: Mechanical impurities, no more Absence Absence phosphorus, not less Water soluble acids and alkalis Absence Absence Plate corrosion test for 3 hours: from steel and copper at 100 °C Withstands from copper at 120 °C, points, no more Ash content, % Acid number, mg KOH/g, no more Stability on the device DK-NAMI (140 °C, 20 h): change in kinematic viscosity at 100 °С, %, no more sediment in petroleum ether, %, max Tendency to foaming, cm3, not more, at temperature: 24 °C after testing at 94 °C Lubricating properties on ChShM: bully index, N, not less than wear index at axial load 392 N, (20+5)°C, 1 h, mm, no more Color, unit CNT, no more Density at 20 °С, kg/m3, no more One of the Russian lubricants that successfully survived the flow of Western analogues after the collapse of the USSR today is TSP-15k gear oil. This product is produced by several large companies, and the demand for it is still quite high. There are several reasons for this. Firstly, many factories producing heavy equipment in Russia still make gears and worm gears with small contact loads and relatively low rotational speeds, which makes it possible to effectively use the TSP-15k. Secondly, the price of this liquid is low. Below we will consider in detail what TSP-15k oil is and where it is used. Specifications According to GOSTs, lubricants must pass a large number of different tests. This gives rise to an impressive list of characteristics. Some of them are very specific and are used in narrow areas. Others are significant and directly determine where this or that lubricant can be used. Below are some of the significant technical specifications transmission oil TSP-15k: The characteristics of TSP-15k have now grown in terms of quality relative to the same grease, produced in Soviet times. The reason is the use of a more technologically advanced additive package and a cleaner base. Scope and analogues Traditionally, the scope of TSP-15k oil is Russian agricultural machinery and trucks, such as KamAZ, KrAZ and URALs. Even the index "k" in the name of the lubricant is still popularly associated with the word "KAMAZ". Basically, it is poured into the transmission of those trucks that were produced no later than 10 years ago. According to GOST According to SAE According to GOST By API 9 75W TM-1| GL-1 12 80W/85W TM-2 GL-2 18 90 TM-3 GL-3 34 140 TM-4 GL-4 - - TM-5 GL-5 More technologically advanced oil is poured into the new transmission units of modern Russian cars. Although some pieces of equipment are still leaving the assembly line, into the bridges and transfer boxes of which it is permissible to fill lubricant from this category. In technical terms, the use of TSP-15k oils is suitable for their use in any units in which the following conditions are met: the transfer of kinematic energy is carried out by means of gear cylindrical and bevel, worm and hypoid gears; the maximum possible contact load is below 2500 MPa; the maximum operating temperature does not exceed 130 °C. Fluid for transmission units TSP-15k according to GOST is classified as TM-3-18. When translated into other international standards, this means that the oil is close in performance to the API GL-3 class and to the SAE 85-W80 class. The American standard GL-3 is as close as possible, but is not a complete analogue of TSP-15k in terms of key parameters. Popular manufacturers of TSP-15k and reviews of their products Below is a short list of manufacturers of TSP-15k gear oil: All of the above oils do not have sharply negative reviews. The main rule in order to use them as safely and efficiently as possible is to replace them in a timely manner and not pour them into unsuitable nodes.   It might be useful to read: Offshore trap of "Crimean Titan": will the "dirty" plant be modernized?; How to choose electrodes for welding Welding a rail with steel; Production technology of fiberglass pipes Fpipes; Consumer properties of muesli bars and snack products; How to start the production of smoked fish?; Sheet metal stamping technology; From what and how are dumplings made?; The best Tabasaran carpets: description, patterns, features and reviews An excursion into history;