Does anyone have an opinion about BG 75w140 gl-5 for diff? My bg rep recommends it over the 75w90.

 

140 is definitely too heavy for anything resembling normal driving. *Possibly* for a heavy-duty application involving very long periods of balls to the wall operation, but even for a car that sees a lot of track time, 75W90 GL5 will serve you well.

 

Thanks! That's what I needed to know.

 

You aren't getting many responses, since we have gone over mulivis thousands of times. No, don't do it. It is single weight for a reason, use the search and look at BITOG.