The rear axle is hypoid and needs a proper EP (extreme-pressure) oil, but note this is the opposite of the gearbox, which must NOT see modern hypoid additive packages.
Step by step
- 01
Get the car level
Chock the wheels and raise both rear wheels equally so the axle sits level. A tilted axle gives a false level reading.
- 02
Find the filler/level plug first
Locate the filler/level plug on the rear of the axle casing before undoing anything. If it will not shift, do not drain. You will be stranded with an empty axle.
- 03
Drain and inspect
Drain into a pan, inspect the drain plug (magnetic plugs trap swarf, a small amount of fine fuzz is normal; large flakes are not). Clean, refit with a sound washer.
- 04
Refill to the level plug
Pump the new hypoid oil in through the filler until it just weeps from the level hole. That is the correct level. Overfilling can force oil past the pinion seal.
- 05
Refit and drive gently
Refit the plug with its washer. Drive gently for the first few miles and re-check for leaks.
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This guide is a general introduction and is not a substitute for the official Workshop Manual for your car.