it appeared that the oil im using is the Shell Spirax G 140

 

suzukablueS2000 Posted on Jul 15 2008, 05:24 PM
On this website it shows that the Spirax G is GL-4
http://www.shell.com/home/content2/thailan...pirax_0317.html
The single grade SAE 140 will help but you really need the GL-5, as in Spirax A.

If they can get the "G" they can get the "A" as well?
Same viscosity, SAE 140.

 

100k on my diff, ~30 track days, dozen or so auto-x, and even installed my own gears, and no issues yet (knock on wood).

 

I run Motul 90PA mineral OIL. Motul USA shows that is whats recommended for S2k rear diff.

 

thanks for your responce i agree with u, ill check if they have it or not and also ill check the other oils you mentioned before. i hope ill get them. if not!! i might order a diff oil online!!

 

I went to the local autoparts store to pick up some diff fluid to change before the weekend (I want to pick up the LE stuff but not enuf time), and grabbed a bottle of the Mobil 1. I noticed another oil that I've never seen before: Castrol Hypoy C 80w90.

http://www.castrol.com/castrol/sectiongene...ntentId=7036192

Any thoughts on it? Better or worse than the Mobil 1? I'm curious because the weight range is smaller, 80w90, so it may be better for our diffs?