TrueTracs been in the rear end for about 6 months now. I plan to drain the rear diff lube (currently Amsoil 75W-90) shortly to remove any minor impurities/shavings from the new diff install. Any reason I to choose, or not choose, Amsoil's 75W-110 over the more standard 75W-90? Would a loss in MPG's be expected? Not a serious crawler here...

Any feedback, or experience with 75w-110, would be greatly appreciated.

-HB

 

Depends a lot on your application. If your rear is running hotter, it might not be a bad idea to hop over to 110. Amsoil says you don't lose mpg switching from 90 to 110.

 

I would just stick with the Amsoil Severe Gear 75w90. It's one of the best gear lubes on the market so you're already light years ahead in protection.

 

Hows your feelings on the 110?

Im thinking of switching to quiet the lockright down a little. Heck, they recomend I run 140w

 

It wouldn't hurt to try it Jay, but it's also more $$$ down the drain seeing as how the lubes you have right now will go a very long time before needing to be changed again.


People always seem to think that "thicker" means better protection with lubricants, but remember that thinner viscoscity lubricants "flow" better, especially in engines, which helps move heat away, and lubricate critical parts. But seeing as how gear lubes are just a moat that the gears sit in while they spin, perhaps a slightly thicker gear lube might not be a bad idea to try but myself personally I'll just stick with the stock spec, and using high quality gear lubes like Amsoil gives you peace of mind in knowing you're having reduced temps in your diffs and the best protectiong available.