What Does GL Mean in Oil?

API stands for Americam Petroleum Industry and GL stands for Gear Lubricant, see below for their definitions: API GL-1 Straight mineral oil. API GL-2 Mild EP for worm gear oils. API GL-3 Mild EP for spur and spiral bevel gears in axles and transmissions.

Is gl5 better than gl4?

No, the API GL5 rating does not supercede or cover the GL4 rating. It is important to follow the gearbox or diff manufacturers recommendations and use the correct GL rating.

Is GL 5 Synthetic?

Mobil Synthetic Gear Oil 75W-90 is a fully synthetic gear lubricant formulated from synthetic base oils and an advanced additive system. … Mobil Synthetic Gear Oil 75W-90 meets the API GL-5 performance level.

What does GL 5 mean in gear oil?

Let’s take a look at the API GL-5 rating. It is a rating for EP (Extreme Pressure) protection. The higher the EP protection, the higher the GL category.

What does 75w90 mean?

The 75W90 provides superior lubricity which means less wear caused by friction and improved gear protection at extreme temperatures. The 75W90 provides : ▪ Outstanding performance at both low and high temperatures : high viscosity index of 158. ▪ Excellent low temperature properties : pour point of -51oC.

Is 80w 90 the same as SAE 90?

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. SAE 90 gear oil is about the same viscosity as SAE 40 motor oil at 100C (212F).

What does 85w 140 mean?

SAE 90 gear oil in reply to BigTone, 06-02-2012 15:59:55. The 85W-140 is like the newer motor oils and act pretty much the same way as they do as in when cold it acts like a 85W oil and when hot a 140W oil so it helps some in theory that is.

What is difference between gl4 and gl5?

Isn’t the main difference between GL4 and GL5 for enhanced protection of hypoid gears? Hypoid gears generate much more pressure between the gear teeth than other gear designs. Bearings don’t usually have anywhere near the same pressures. That is correct.

Which gear oil is the best?

Synthetic lubricants have a lower friction coefficient in a gearbox, better film strength and a better relationship between viscosity and temperature (viscosity index, VI). … Evaporative losses are lower for synthetics due to the lack of lighter hydrocarbon structures.

What temp does gear oil break down?

Keeping the oil from oxidizing will lengthen drain and replacement intervals. As a general rule of thumb, for every 18 degrees F (10 degrees C) increase in fluid temperature above 140°F (60°C), oxidation will reduce the service life of a lubricant by half.

Can I use 75w90 instead of 75w85?

Yes, a 75W90 (or heavier) can be used in place of Nissan’s recommended 75W85 .

What is 80w90 gear oil used for?

Lubricant. The oil known as 80W-90 GL-5 is a lubricant for the gears in your vehicle. It is used in automatic and manual transmissions, and assists the gears in shifting smoothly.

Which oil is used in gearbox?

Synthetic gear oil is chemical-based gearbox oil made up of polyalphaolefins (PAO), esters oils or polyglycols. Synthetic gear oils are multigrade and have every preventive additive included as part of its makeup. This gearbox oil can be run at extremely high or low temperatures.

What is axle oil?

Axle Oil. There are two different types of gear oils, those used in industrial applications and those used in automotive applications. … Axle oils or axle lubricants are used in many different types of vehicles, including passenger cars, commercial trucks, as well as agriculture, mining, and construction equipment.

What is a gear box?

To be very precise, Gearbox is a mechanical device used for torque increase/decrease via speed reduction/increase. It consists of two or more gears with one of the gears driven by the motor.

Can I use gear oil in my engine?

Because an internal combustion engine has an oil pump and lubricates the bearings with a hydrodynamic film, extreme-pressure additives such as those used in gear oils are not necessary. … A hypoid gear set can experience boundary lubrication, pressures and sliding action that can wipe most of the lubricant off the gears.

What does 10w 30 mean?

The “W” in 10W-30 oil stands for “weight.” Oil changes its viscosity with temperature and the single viscosity rating only represents the flow of oil when it’s warm. … Thus, SAE 30 oil takes approximately 30 seconds to flow through the tube. This single viscosity rating is sometimes called the oil’s “weight.”

How do you check gearbox oil level?

Many suggest changing the gear oil at least every 70,000 miles. In general, mineral gear oil needs to be changed more often, while synthetic oil lasts longer.

What is differential oil?

The differential oil lubricates the ring and pinion gears that transfer power from the driveshaft to the wheel axles. If your car is fitted with a limited-slip differential, it also keeps all the moving parts in that assembly healthy. The purpose of the differential fluid is to cool and lubricate your differential.

Is gear oil the same as transmission oil?

While some manual transmissions now use automatic transmission fluid (ATF), most manuals use a variety of fluids for optimal engine and gear function. Gear oil isn’t the same thing as ATF, and knowing the differences can make or break your car. … Gear oil works to lubricate and prevent corrosion in a manual transmission.

What is a hypoid differential?

A hypoid is a type of spiral bevel gear whose axis does not intersect with the axis of the meshing gear. … In hypoid gear design, the pinion and gear are practically always of opposite hand, and the spiral angle of the pinion is usually larger than that of the gear.

What is auto clutch manual?

Summary: If you’re shopping for a car and you see the term “automated manual transmission” (or sometimes “automated-clutch manual transmission”), it refers to a transmission that’s mechanically similar to a stick-shift, except a computer performs the clutch work.

What is gear oil used for?

Gear oil is designed to protect vital components, including the gears and bearings in the drive axles and differentials, transmissions, industrial gear boxes and power take-off units. Gear oil generally has a higher viscosity for easier distribution and protection through the entire gear set.

What is transmission fluid used for?

Transmission fluid is a slippery liquid that acts as a lubricant for all of the moving parts inside your transmission. In an automatic transmission, this fluid also serves as a coolant and a viscous fluid that transmits power from the engine to the transmission. A variety of fluids are used for different transmissions.

Why are synthetic oils used for engine lubrication?

The difference is that synthetic oils are made from more advanced refining processes and are of a higher purity and quality than conventional mineral oils. This not only removes more impurities from the crude oil, it enables individual molecules in the oil to be tailored to the demands of modern engines.

What is SAE 90 gear oil?

SAE 90 is a very large scale. 80W-90 is the low end of the scale, while 85W-90 is the high end of the scale. Both are single grade SAE 90 oils. SAE 75W-90, is more appropriate in most climates where 90 is specified, specially if it is a transmission.