Jimbo

I have an automatic and the owner's manual lists SAE 90 hypolid oil. If I change the oil can I use Castrol Syntec SAE 75-90?

If not, is there a synthetic 90 wt gear oil I can use?

Steve Cattaneo

A multi grade oil of 7 5 / 90, i s perfectly safe to use in a place of seasonal changes.

If your rear is posi, you will need to add a posi additive to the oil.

<a href="http://www.1st-in-synthetics.com/gear_lube.htm" target="_blank">http://www.1st-in-synthetics.com/gear_lube.htm</a>
<img src="graemlins/beerchug.gif" border="0" alt="[cheers]" />

Jay Wellwood

FWIW - I used Mobile 1 75-90w when I replaced my fluid. No problems to date.

A hint though - be sure to REMOVE THE FILL PLUG FIRST before draining the R&P housing.

hth-

chris928

mobile synthetic is OK but Amsoil is much better in my experience. Here is another believer:

<a href="http://members3.boardhost.com/928s4vr/msg/24761.html" target="_blank">http://members3.boardhost.com/928s4vr/msg/24761.html</a>

928 U.K.

i phoned Porsche GB and they said a 75/90 is the best possible oil


cheers Tim 84 s2 auto

Jimbo

Thanks for the replys. I'll go with 75-90.