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which diff oil & gearbox oil
dunk3 - 29/12/08 at 07:43 PM

Hi all I am ready to fill my standard sierra diff with oil, but not sure what grade to use. Plus what oil do i use in my type 9 gearbox. cheers..

tomgregory2000 - 29/12/08 at 08:30 PM

i used ATF in the gear box and special ford diff oil but i have a LSD and it was very expensive

A1 - 29/12/08 at 08:33 PM

im using some millers oil in the lsd diff, was about 15 quid for a litre. i bought it from fluke motorsport.
seems pretty good...not done much hard driving yet so not 100% sure.

minitici - 29/12/08 at 08:44 PM

If it is a Sierra rear LSD, it uses Hypoid SAE90EP oil.
It does not need special "LSD" oil as the lsd is a sealed viscous coupled unit.

IDONTBELEIVEIT - 29/12/08 at 08:55 PM

EP90

tendoshingan - 29/12/08 at 09:47 PM

I needed exactly the same,
from everything I found you need:
gearbox oil: standard oil grade 75W90

differential oil: EP90 GL5 spec
I think that's right