What oil is best for gearbox?

10 Best Gearbox Oils

• Castrol. ...
• Liqui Moly 4433 High Performance Gear Oil GL4+ SAE 75 W-90. ...
• Forte. ...
• Motul. ...
• SMOTIVEPRO. ...
• Westway Lubricants. MTF 94 Manual Transmission Oil 5L 5 Litres. ...
• Mobil. Mobil SAE 75W-90 Mobiltube SHC Gearbox Oil, 1 Liter. ...
• febi bilstein. febi bilstein 21829 Gear Oil SAE 75W (GL-4), pack of one.

What type of oil is used in a gearbox?

For example, most modern gearboxes require a GL-4 oil, and separate differentials (where fitted) require a GL-5 oil. While they take the same form, the viscosity grades for gear oils are on a different scale than the viscosity grades for an engine oil. The viscometrics for gear oils are standardized in SAE J306.

Does it matter what gearbox oil I use?

Lower and higher viscosity oils are suited to different applications. Lower-viscosity gear oils offer better protection and lubrication for high-speed gearboxes that are under relatively low loads thanks to their improved cooling abilities and thinner films which better coat fast-moving components.

How do I choose a gearbox lubricant?

The viscosity for a gear lubricant is primarily chosen to provide the desired film thickness between interacting surfaces at a given speed and load. Choosing an appropriate viscosity grade is usually as simple as finding the recommendation in a component's maintenance manual.

Should you grease gears?

Grease lubrication can be applied in low speed / low load applications, however, it is important to apply grease periodically, especially for gears of the open-type usage. Since lubricants diminish or become depleted in the long term, periodic checks for oil change or refilling is necessary.

What is the viscosity of gear oil?

The viscosity of synthetic oils according to the ISO grading system is between 32 to 6800. Synthetic gear oils are used for gears operating under extreme conditions: very low or very high temperatures, high pressures.

Is 75w90 better than 80w90?

80w90 is the best oil for winter and summer weather conditions. 80w90 has a higher rating than 75w90 due to its tolerance to both cold and hot conditions. But 75w90 is limited to higher temperatures to minimize premature wear and tear. The winner under this category is 80w90 gear oil.

Is Thicker gear oil better?

When it comes to lubricants, especially for axles, the stance among fleet owners and operators has traditionally been that thicker viscosity is better. After all, thick lubricants do protect. Gear oil must protect critical hardware within the axle while operating in extremely demanding conditions.

Can I use thicker gear oil?

Bearings are better lubricated by thinner oils and so the change to a thicker lube in the gears increases the likelihood of bearing failures.

Are all gear oils the same?

All gear lubricants are definitely not the same. There are differences in the additive technology used for lubricants for each specification, and just because one type of gear oil works well for one type of gear application, that doesn't mean it will work well for all.

Is gear oil and transmission oil the same?

Transmission fluid, also called gear oil, ensures smooth functioning and extended life of transmissions, transfer cases and differentials in cars, trucks and other machinery. Like motor oil, they are composed of base oil (mineral, semi- or fully synthetic) and additives.

What does 80w90 mean?

The “80W-90” numbers apply to oil viscosity. This oil has two numbers and has two grades of viscosity. 'W' refers to winter stability. In this situation, the amount “80” means that the oil operates better at lower temperatures. The second number, that is, 90, indicates how thin the oil must be at 100°C.

What is 90 weight gear oil used for?

It has been designed to reduce friction & wear, perform under the highest levels of heat & stress, and is recommended for use in differentials, manual transmissions, worm gears, power dividers, supercharges, and all gear boxes that require a gear lubricant.

What gear oil is heavier?

The SAE grading system indicates oil viscosity in simple numbers ranging from the thin oil (10) to the very thick oil (140 or above). Heavier weight, or higher grade oil is more viscous and therefore thicker as it flows between the gears. Light grade oil is ideal for small, fast, polished gears under a light load.

What happens if you use the wrong gearbox oil?

Using the wrong fluid can cause poor lubrication, overheating, and possibly transmission failure. A mechanic might not be able to reverse the damage, even by flushing the transmission. Mistakenly adding motor oil or brake fluid can also destroy your transmission.

Can you mix different gear oils?

Mineral oils, PAOs and esters may all be mixed together. Only polyglycol type synthetic oils (PG or PAG) may not be mixed with the other lubricant types. They can react together and form gum gels in the casings. Furthermore, they can sometimes be incompatible and immiscible with other polyglycols.

What is 140 gear oil used for?

Gear Oil GL-5 SAE 85W-140. Gear Oil GL-5 SAE 85W-140 gear lubricant is recommended for use in spiral bevel and hypoid differentials, power dividers, and oil-lubricated steering axle wheel bearings. Good gear life — Extreme pressure properties protect hypoid and other types of gears from scuffing and wear.

Can I use 80w90 gear oil instead of 75w90?

The oil weight is not a noticeable difference, most if not all 75w90's are synthetic or synthetic blends. 80w90's are dino oil. I would think your oil change interval would be reduced by half, so 50k miles instead of 100k. 80w90 should be safe to use, and you won't notice a difference.

What is 80W-90 gear oil used for?

GEAR OILS UNIVERSAL SAE 80W/90 are incredibly high-pressure gear oils. They are used wherever high levels of stress occur, such as in hypoid gears of road vehicles, final drive gears, planetary gears, construction machinery, agriculture and industry.

What is the difference between gear oil and differential oil?

Differential oil, which is also known as gear oil, is thicker compared to engine oil. As a lubricating oil, gear oil prevents vehicles' metallic components from damage and increases their overall performance. The oil also makes it easy for cars to make corners in a hassle-free way.

What's thicker 75w90 or 75w140?

A 75W-90 is thinner at higher oil temperatures than a 75w140

In other terms, 75w90 is thinner at high temperatures than 75W140. This indicates that 75w140 will do a better job for your car in hot climates.

Is 80W 90 the same as 10W 40?

The most common mistake is the belief that the viscosity of SAE 80W gear oil is much thicker than the viscosity of SAE 10W-40 motor oil. This is absolutely incorrect!

Is 80W-90 the same as 90 weight gear oil?

80W-90 oil is as thin as an 80W oil when cold, and as thick as a 90W oil when hot. A 90W oil is 90W hot or cold. So an 80W-90 will be a little bit thinner than a 90W when cold, but will be essentially the same when hot. Gear oil viscosity is defined in SAE J306, which has been revised.

What does 80W mean?

The numbers "80W-90" refer to the viscosity grades of the oil. Since it has two numbers, this oil has two viscosity grades. The 'W' means winter. The number "80" -- in this case -- signifies that the oil is designed to work well in lower temperatures.