Hello. I want to change the oil in my Impreza rear diff. Does anyone know the proceedure, and what oil is recommended please?

Regards.

Max

 

Pretty easy this one. On the rear of the diff is two drain plugs with square indents (use a 1/2'' drive ratchet).
Remove the top one first to let air in.
Remove bottom one and let it drain.
Replace bottom drain plug.
Fill with 0.8 Litres of gear oil (75W-90 driveline or similar for viscous LSD, for plated LSD's a specific oil is needed (type R/Ra)).
Replace top plug.
Done.

It's very fiddly getting the oil in due to the space, a seringe is usefull.

 

Thanks for the reply. Sounds good.

I guess raising the rear of the car *not* by the rear axle would create more clearance as the suspension sags.

 

No, that won't make any difference. It's not a 'live axle'. The diff is fixed to the underside of the car via rubber bushes, with the drive shafts articulating with the wheel movement.

 

Of course - silly me. It's a proper car with a sensible design.