15W-50 in transfer case when called for 5w-30

[sdowney717]

I happened to change it when I first got the Trooper and thought why not put in the thicker Mobil 1 oil in there, but I think I will change it to a 0w-30 oil in a few weeks. It drives fine on the oil in the TC, but I am wondering how much extra drag this heavier oil creates as far as hurting the mpg.

I recently changed engine oil from 15W-40 to 0W-20 and will see if that makes a difference, before moving on to the TC.

None of the oil gets wasted, I just put old oil into our 98 Ford Contour which leaks it out from the valve covers.

 

[PimTac]

Trying to get better fuel economy in that old Trooper is likely futile. You won't see any noticeable improvements regardless of what oil or transfer case fluid you put in.

 

[ledslinger]

Filter that Mobil II through a coffee filter or paper towel before dumping into the Contour.