Moderator
Mobil 1 75/140 syn gear lube
Have 3800 miles on truck and I just purchased 4 quarts to change my diff. I went with the 75/140 because we tow very heavy. It was $14.99 per quart as opposed to Mobil 1 75/90 that cost half of that. Someone told me they blend half 75/90 and 75/140 ?
I have not tried that. Any suggestons ? I wouldn't think that the mpg would be much different between the two. Thanks
0000000
Moderator
I did about 1k on my new truck in 03 and dropped the grape juice out and put in Amsoil 75/140. I also tow heavy. I think that for us guys that do tow heavy that weight combination is a good idea. The rear diff runs cool as a cucumber.
Denny
2018 GMC Denali HD 2500 L5P.
Busting tires
I put 75/90 in our tow trucks(commercial towing)
Main rig-1978 chevy 3/4 f/t 4x4 8" lift 38 14.5 16 toyo m/t's. BUILT 350(soon to be 6.2) quad batteries. front and rear 15k winches. lockers F/R. dana60 front full float corp 14 rear. th400/np203.
donor rig. 1988 GMC K3500 140k miles, th400. IFS(read CRAP) semi float 14 rear. drove it 142 miles home at 17mpg and 1/4 quart of delo 400.
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