Quick one on gearbox oil.
 

Hi folks. I have recently purchased my first scoob, a Impreza wrx sti hawk, and I'm over the moon with it. I just wanted to ask if the Silkolene SILKTRAN SYN 5 75W-90 Fully Synthetic Gear Oil can be used in the rear diff aswell as the gearbox. And I believe I will need 6ltr.

Cheers peeps.

Nope as its a plated rear diff, you need a 90pa oil i use motul 90pa in mine for years and motul300 in the box but any good brand will be fine.

Ahh, got ya. Sweet as mate thanks for the reply.

Is yours dccd?

It is mate yea.

Then a LS oil for diff and normal 75/90 for box.

I've used millers crx 75/90 nt for box and millers crx 'LS' 75/90 nt for diff in my dccd.
Notice the LS (limited slip) in the spec

Cheers very much for your help.

75W/140 LS for both?
 

Hi, its my first Subaru - i bought a Hawkeye 2007 WRX STI with DCCD.
i want to change the oil in the gearbox and diff.

Someone told me i should for both use oil with specification 75W/140 LS

Should i?

Thank you

Hi

No, you want a 75w-90 for the gearbox and this one is ideal

http://www.opieoils.co.uk/p-899-motu...-diff-oil.aspx

The diff needs a SAE90 LSD oil, like the Fuchs Titan Race Gear 90LS, Castrol Axle Z or Motul 90PA.

http://www.opieoils.co.uk/c-679-sae-90-gear-oils.aspx

Cheers

Tim

iam more and more confused about it.... so i should not to use a 75W/140 for the gearbox? i tought it will be better

do NOT use LS oil in a road style synchro box - the grade "may" be correct for your use if its arduous use, overly stressed, etc but generally isn't ideal for a road car and a high quality 75w90 will do the job

we carry various specific options on the shelf as well as the hands on knowledge to provide the correct fluids ;)

No its 75w 90 as said dont use ls oil in the box only the rear diff.

Hi

Thicker oils put more strain on everything, so you tend to only use thicker grades when the oil is getting hot enough to thin out. Unless it's a heavily modified track car, it's unlikely to get hot enough to need a thicker oil and using a 75w-140 oil will just make it harder to change gear.

Cheers

Tim