what do you recommend

**Firebirdformula** · 05-27-2009, 12:43 PM

what type of rear end differential oil do you recommend for a 2000 firebird formula ......kuz i gotta gasket leak for sum reason

**silverWS6** · 05-27-2009, 03:24 PM

I use royal purple on mine. Works good

**thearborbarber** · 05-27-2009, 04:11 PM

Amsoil Severe Gear. Contact Compsyn. He is a member and sponsor on the board and can set you up.

**CompSyn** · 05-28-2009, 08:36 AM

Whatever brand of gear lube you choose, go with SAE 75W-110 rather than the SAE 75W-90. You’ll have less potential for differential chatter with the 75W-110.

CompSyn

**99_Z28** · 05-28-2009, 09:50 AM

I run Lucas 85W-140 with a Mac cover in the 10 bolt.

**RyanJM** · 06-01-2009, 10:17 PM

I have run redling in my rear for a while and then royal purple since that's what they had at the local auto store. Never noticed a difference. Make sure you get the GM additive for the rear as well.

**karpetcm** · 06-02-2009, 09:57 PM

The guy who has done my last 4 diffs has always put the thicker oil i think its 85W-140, i do remember him saying 140. He said its less likely to make noise and protects better, i go with what he says since ive never had an issue in any of my Fbods that ive taken to him.