What does API GL mean?

GEAR LUBRICANT
Gear Oil Industry Specifications – API GL is short for ” GEAR LUBRICANT” API has the following GL classifications: for Gear Oils – GL-1: Oil without EP additive. GL-2: Usually contains fatty materials. GL-3: Contains a mild EP additive.

What is the difference between API GL-4 and API GL-5?

GL-4 is suitable for hypoid gear service when they are under severe service but are without shock loading. GL-5 is suitable for hypoid gear service under severe service and shock loads and not for use in a gearbox.

What does 85w90 mean?

The value before the “W” (W=winter suitability) indicates the flowability of the oil at cold temperatures. Transmission oils with 85W remain flowable up to -12 °C. The number “90” refers to the kinematic viscosity of the gear oil at 100 °C. This comprises a range of 13.5 – 18.4 mm²/s.

What is GL 6 gear oil?

The designation API GL-6 denotes lubricants intended for gears designed with a very high pinion offset. Such designs typically require protection from gear scoring in excess of that provided by API GL-5 gear oils.

Can API GL-5 be used in place of 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 full synthetic gear oil better?

Synthetic lubricants have a lower friction coefficient in a gearbox, better film strength and a better relationship between viscosity and temperature (viscosity index, VI). This indicates synthetic lubricants can be used at lower viscosity grades and lower temperatures.

Can I use 75w85 instead of 75w90?

Our answer: Yes, 75W-85 gear oil can most definitely be replaced by 75W-90. In fact, we know that some GM dealers will use 75W-90 gear lube in applications where Chevrolet/Buick/GMC/Cadillac suggests 75W-85.

Who makes GL-6 oil?

Currie 85W-140 GL-6 Racing Gear Oil.

How often should gear oil be changed?

Manual gearboxes usually require a gearbox oil change every 30,000 to 50,000 mi (48,000 to 80,000 km). Automatic gearboxes usually have gear oil change intervals of between 60,000 to 100,000 mi (96,000 to 160,000 km).

What is API GL-4 oil?

3.1 API GL-4 The designation API GL-4 denotes lubricants intended for axles with spiral bevel gears operating under moderate to severe conditions of speed and load, or axles with hypoid gears operating under moderate conditions of speed and load.

Which gear oil is best?

Best Sellers in Gear Oils

• #1. Quicksilver SAE 90 High Performance Gear Lube.
• #2. Lucas Oil LUC10043 Oil SAE 80W-90 Heavy Duty Gear Oil – 1 Quart.
• #3. Valvoline SynPower SAE 75W-90 Full Synthetic Gear Oil 1 GA.
• #4. Valvoline High Performance SAE 80W-90 Gear Oil 1 GA.
• #5. Muc Off Dry Lube (50-ml)
• #6.
• #7.
• #8.

Can you mix synthetic gear oil with regular gear oil?

So, in the end, conventional and synthetic oils are comprised of the same, compatible components – it’s just that the components in synthetics are much higher quality. While you can safely mix synthetic and conventional oils, you’re doing nothing more than diluting the performance of the synthetic oil.

Is 85W140 synthetic?

Twin Power Semi Synthetic 85W140 provides smooth shifting. Our semi-synthetic base formula means ultra-high films strength and shear stability that resists viscosity breakdown and increases service life.

What happens if gear oil is not changed?

If you don’t change your gear oil according to the manufacturer’s suggested schedule, you risk severe damage to your car’s transmission and other gear systems. This could mean having to replace parts and repair your transmission, at substantial cost. Gear oil deteriorates over time.