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View Full Version : What oil weight is recommended for rear....



KurtM
02-18-2004, 04:08 PM
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
02-15-2006, 02:32 PM
synthetic 75w-90 or use the 140wt for LSD units.

dacoyote
02-15-2006, 02:39 PM
Pep Boys sucks.... Not that it adds anything to the discussion

ryan roopnarine
02-15-2006, 02:53 PM
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
02-15-2006, 06:30 PM
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
02-15-2006, 08:31 PM
synthetic is a given, the rear gears are so small that they would literally wear out in under 100k with reg lube.