djwrx

Hi all I want change my rear diff oil on wrx 2003 reg . Am I right in thinking its 75/90 and fill till comes out of filler hole ??
Is castrol syntrax recommend ?
Thanks

Infected by sti

iTrader: (6)

I used motul 90pa in mine, its an LSD oil, it took just over a litre iirc, filled through the drainage plug until it trickled back out yes

djwrx

Cheers thanks for that

adz556

iTrader: (5)

Where is the draining plug on the rear diff please? It's really obvious on the gearbox but not so much the diff? How can you fill it and drain it from the same place?

Stupid questions I know

scoobaru mad

iTrader: (2)

Hang on a minute. I didn't know the WRX newage had an LSD fitted.

So just to confirm/add

I was gonna order Castrol syntrax 75/90 for the gear box an rear diff. 5 litres of it to be exact? But I'm presuming I need a different oil for the rear diff?

Inviroman

iTrader: (2)

Look under the rear of the car and on the rear diff case there is two plugs, top one is the fill, bottom is the drain, take the car for a drive to warm up the oil the. Remove the bottom plug to assist the oil draining remove the top plug, once all the oil has drained refit the bottom plug and fill via the top plug until oil drips/runs out refit plug job done.
I used Millers CRX 75/90 full comp oil.

Beware the plugs can be tight and will need box key adapter or 1/2 drive bar will also fit

Same oil for box and rear diff, gearbox holds approx 4 litres and rear diff 0.8 litres so one 5 litre can does the job.

And there is two drain plugs on the gear box!

djwrx

Just looked on YouTube and there's guide how to to do

djwrx

They also recommend to take filler plug off first before draining just incase seized on !!

Maz

iTrader: (34)

Wise advice. Imagine draining and then finding you can't undo the filler plug! Bit late then to take it to a garage. Another vote for Millers CRX 75 90nt.

blackvenom

really easy job, make sure the car is level. best to undo the top first to double check you can fill it before you drain it out then can't open the top. also allows the fluid to flow better, make sure the area is clean so dirt/grit dont get blow up by the wind, know its a small chance to get into the hole but only takes a min to reduce the risks.

djwrx

Has anyone used castrol syntrax in rear diff ? Just seen prices at halfords are pretty cheap for it

blackvenom

Yes I have, used it a couple of time, does the job. No new noises or heat. No bad side effects,

blackvenom

Read Some reviews before I tried it and no one had a bad word, maybe if it was a track car or driven hard a better oil may be needed but I would buy it again.

djwrx

Cheers guys ... Think will go with syntrax . Halfords down the road