Sucked the dino **** out of the 125k mile rear end. I was averaging about 22 mpg.

Refilled it with Alisyn Pro Gear Type 3 (their thickest gear oil, has a consistency close to water).

Driving to and from work, same roads as before, same gas stations, same kind of driving, with driver window down I averaged just about 26mpg.

I am impressed.

Those with old gear oil, switch to synthetic.

 

how does changing the rear end oil give ya 3mpg?

 

less resistance from the rear end?

 

26!!!!!! your so lucky!!

 

if you did your math right** that is pretty good.

that oil musta been crap...

 

My old oil was thick, could probably pass off for a solid.

 

haha, in 1992 you may have had dino oil, in which case it should be changed pretty often. all of the newer trucks come with synthetic oil that has a 100k mile drain interval, so this may not be an issue for a lot of newer vehicles. then again, i do have free tax and shipping on AMSOIL synthetic gear oil

 

Hey thats the good thing about these 4bangers they get good gas mileage!