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Buy Differential Oil Online

Also known as: Axle Gear Oil, Diff Oil, Gear Oil

OEM & aftermarket differential oil from top brands — compare prices, check fitment, order with free delivery

Browse differential oil from trusted brands. Compare prices, check vehicle compatibility, and order with fast UK delivery.

Differential Oil buying guide — what to know before you buy

Differential oil (gear oil) lubricates the gears and bearings in the differential, transferring engine power to the driven wheels. Neglected differential oil degrades, causing increased wear, noise, and eventual gear failure. Regular replacement at the manufacturer's interval extends differential life and ensures smooth, quiet operation.

When to change differential oil

Differential oil breaks down over time due to heat, shear forces, and metal particle contamination. It is often overlooked in service schedules but is critical for drivetrain longevity.

Change at the manufacturer's recommended interval — typically every 30,000-60,000 miles
Whining, humming, or growling noise from the rear axle indicates low or degraded oil
Check for leaks at the differential cover gasket, pinion seal, and axle seals
Metal particles on the drain plug magnet indicate normal wear — excessive particles signal a problem
More frequent changes required if the vehicle tows or carries heavy loads regularly

Choosing the correct differential oil

Using the wrong oil specification can damage the differential. Limited-slip differentials (LSD) require specific friction-modified oil.

Check the vehicle handbook for the correct oil grade (e.g., 75W-90 GL-5)
Limited-slip differentials require oil with LSD additive — standard gear oil may cause judder
Synthetic gear oils offer better protection at extreme temperatures
Always fill to the correct level — overfilling causes seal damage, underfilling causes wear

Frequently Asked Questions

Are differential oil and axle gear oil the same thing?

Yes. "Differential Oil" and "Axle Gear Oil" refer to the same car part. Other common names include Axle Gear Oil, Diff Oil, Gear Oil. The part is the same regardless of which name is used.

How often should differential oil be changed?

Typically every 30,000-60,000 miles. Towing, heavy loads, and off-road use require more frequent changes. Check your vehicle handbook for the specific interval.

What happens if I don't change differential oil?

Degraded oil loses its lubricating properties, causing increased gear and bearing wear. Eventually, the differential will become noisy, then fail — a very expensive repair.

Do I need special oil for a limited-slip differential?

Yes. Limited-slip differentials require gear oil with a friction modifier additive (often labelled LS or LSD). Standard gear oil causes chattering and judder on tight turns.

How do I check differential oil level?

Most differentials have a filler plug on the side. Remove the plug — the oil level should be at the bottom of the plug hole. If oil flows out, the level is correct.

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Popular OE numbers for Differential Oil

Commonly searched OE numbers fitting Differential Oil from the TecDoc catalogue.

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