11H Posted October 24, 2006 Report Share Posted October 24, 2006 I see you have a wonderful tech section and Mr P has a very nice tutorial for R&R'ing rear diff fluid ... Rather than botch up his excellent thread, I thought I would toss this out there and the admin/mods here could do with it what they like ... However, there seems to be MUCH confusion at times on the forums about what lube is OK and if the $30 a qt purple fluid is required ... (If it is still purple) I found this letter back in 2002 or 2003 __________________________________________________ Note from Michael Asmussen, Torque Control Division of Eaton Corp. We recommend the following lubricants for our locking differentials: 1) Texaco 2276; Synthetic 75W90; GM part# 9986115 2) Texaco 9622; Mineral Based 80W90; GM Part# 9985290 3) Texaco 2080; Synthetic 75W140 (Heavy Service); GM Part# 9985991 Note- All of the above lubes are pre-blended with friction modifier. No additional modifiers necessary or recommended. As far as other lubes are concerned, any standard GL5 lube will work, but the units perform optimally with the 3 listed above. ____________________________________________________ I have emailed Mobil on the use of M1 75W90 and their comments were: "Mobil1 synthetic gear lubricant meets GL3, GL4, and GL5 API ratings. If the manufacturer allows ONLY the use of GL3, or GL4 with no mention of GL5 then you cannot use M1 Synthetic Gear Lubricant" I have also heard the new Arvin-Meritor 500,000 mile lubes in the right viscosity are compatible as well ... *** I have used Mobil 1 75W90 in all my previous G80 diffs without issues, however I never pulled heavy. 11H Quote Link to comment Share on other sites More sharing options...
JC03SS Posted February 27, 2012 Report Share Posted February 27, 2012 I use amsoil in mine and have been since 07 and no probs. I have towed some heavy stuff too. I recommend amsoil oils to everyone I know. That's just my opion.. Quote Link to comment Share on other sites More sharing options...
abss_2003 Posted June 2, 2014 Report Share Posted June 2, 2014 (edited) So syn 75w140 GL-5 is ok Edited June 2, 2014 by abss_2003 (see edit history) Quote Link to comment Share on other sites More sharing options...
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