Gear oil 75w90 characteristics

Stable operation of a vehicle is possible only when high quality oil is used in automotive components. Gear oils deserve more attention from motorists, but now they use motor oils more.

General purpose of transmission oils

Gear oil lubricates the gears of cars in the transmission units - steering gears, driving axles, transfer cases, gearboxes and power take-offs. Such oils reduce friction losses and reduce wear of parts in transmission units, cool and protect friction parts from corrosion.

Gear oil is intended for:

• to reduce energy consumption for friction,
• to protect parts from wear and tear,
• to reduce vibration, shock and noise,
• to remove wear products from the friction zone.

Gear oils must have excellent viscosity-temperature characteristics. They fill the hydraulic system, lubricate the mechanical and hydraulic transmission units of industrial machines and gearboxes with gear and worm gears.

The viscosity of the oil is selected depending on the operating conditions:

• maximum - to prevent losses through sealing parts,
• minimum - for starting transmission units at low temperatures and reducing friction losses.

When using high-quality gear oil with good characteristics, significant savings in fuel and lubricants are noticeable.

Types and differences of GL4 and GL5 tolerances

Gear oils are divided into 5 main grades. GL4, GL5 belong to a new class, which appeared thanks to a gearbox with a hypoid transmission combined in one housing. This design was required so that two incompatible oils could not mix with each other. For her, a class of oils was developed that meets the requirements for different classes.

A new universal class of greases is used simultaneously in drive gears and gearboxes:

• With GL5 oils, the hypoid transmission becomes particularly reliable under high voltages and shock loads.
• GL4 oils are intended primarily for use in gearboxes of front wheel drive vehicles. This type contains half the amount of sulfur-phosphorus additives that create a protective coating on rubbing parts.

The GL4 / 5 marking is used by Asian manufacturers, and the GL4 + designation is used on European-made materials. Some motorists consider these oils to belong to different classes, but they are wrong.

Gear oil 75w90: synthetics and semi-synthetics

The basic modification of a semi-synthetic product contains 78-45% mineral, 20-40% synthetic and 2-15% additives. Synthetic gear oils are based on a synthetic base only.

Synthetic 75W90 oil is made from polyalphaolefins with appropriate additives or from a hydrocracking agent with additives. The main characteristics of the 75W90 oil are:

• protection of transmission units from friction, oxidation and wear,
• increasing the performance of the transmission,
• the ability to operate in very low and high temperatures,
• dissolution of salt deposits,
• preservation of polymer seals.

75W90 oil is synthetic, despite the fact that many sellers refer to it as semi-synthetic.

Overview and characteristics of popular gear oils

Consider the most popular gear oils from various manufacturers.

Transmission oil 75w90 Lukoil

The TM-5 series of oils from Lukoil with improved viscosity-temperature characteristics is designed for mechanical transmission units with any type of gearing. This oil is widely used in automotive transfer cases, drive axles, steering gears, etc. Lubrication allows operating transmission units at low temperatures and significantly saves fuel.

Castrol

Castrol 75W-90 synthetic oil protects against wear under extreme loads. Recommended for use in manual transmissions using VW 501 50 and API GL4 oils.

say

Zic's latest generation gear lubricant has excellent low temperature fluidity and excellent anti-friction properties. The oil will significantly extend the service life of the transmission, since it has a full set of additives and can be used in any, even extreme conditions, in manual transmissions and in driving axles. The checkpoint is much quieter, and its resource is significantly increased.

Liqui Moly

LIQUI MOLY synthetic oil has shown excellent performance in manual transmissions as well as in hypoid transmissions where API GL4 + grease is used. Due to its excellent viscosity-temperature characteristics, the oil effectively protects against corrosion and wear with an extended service life.

TNK

Semi-synthetic transmission oil TNK belongs to the highest class and is used all year round. It is manufactured using modern technologies from high quality base oils with the addition of imported components.

Shell

Shell synthetic oils have the highest performance and are designed for use in heavily loaded transmissions of sports cars.