What oil weight is recommended for rear....

[KurtM]

differential? Stopped by Pep Boys last night to pick up Red Line injector juice and bought 2 bottles Castrol Hypoy C 80W-90 gear oil.

Wanted an opinion on what is recommended or others use.

Thank you
Kurt
95 525ia

[632 Regal]

synthetic 75w-90 or use the 140wt for LSD units.

[dacoyote]

Pep Boys sucks.... Not that it adds anything to the discussion

[ryan roopnarine]

castrol hypoy c is unsuitable for this application, as, as regal said, it calls for a synthetic oil. the 80w numbers up front usually only come with conventional gear oils, not synthetics. depending on what the diff tag says, you need a 75w90 or 75w140. mine is quite happy on royal purple 75w140 with a tube of LSD additive thrown in so i wouldn't have to do it twice. it should cost you between 8-14$ per bottle for suitable stuff, and you need two bottles.

[Russell]

Believe it states so in the manual. My indy has changed it for me twice. I think he used redline.

differential? Stopped by Pep Boys last night to pick up Red Line injector juice and bought 2 bottles Castrol Hypoy C 80W-90 gear oil.

Wanted an opinion on what is recommended or others use.

Thank you
Kurt
95 525ia

[632 Regal]

synthetic is a given, the rear gears are so small that they would literally wear out in under 100k with reg lube.