Re: Stupid question but…

Posted by HH56 On 2022/8/15 21:07:45

I believe most have settled on regular GL-1 90 wt gear oil for general use in the trans. In extremely hot climates some have gone to the GL-1 140wt or even the multi viscosity offering. If you have an overdrive the lubricant is shared between the units and in that situation it would probably be best to stick with 90 wt. The OD manual makes no mention of anything over 90 and actually suggests even thinner oil but allows the 90.

GL-5 85-140 which is an extended pressure oil is good for the rear axle but is not recommended in the transmission particularly if there is an overdrive involved. Borg Warner expressly states not to use any EP lubes in the overdrive.