Originally Posted By: Panzerman
Originally Posted By: OtisBlkR1
Im no expert, but every 30,000 my diffs get drained and refilled with whatever is on sale... ive owned many autos and never had a issue with this approach.
I am gonna second that, Ive tried three different brands, all synthetic, all 75w90 and I could tell no difference in noise, gas milelage or anything. Whatever I get a deal on.
yep, go into the zone, whatever 75w90's (or correct spec for my application) is on sale is what goes in it.. and frankly with this approach ive never noticed any rearend noice, ect,ect.. and to be real honest most of what comes out usually looks almost as good as the new stuff going in. Ive never been able to tell (seat of the pants) any difference after i change gear oil..