hawkeye-08 wrote:
jake2250 wrote:
I just changed the differential fluids and transfer case on my 2012 Silverado 2500HD.
I used Mobil 1 75-90 Full synthetic, I have 35000 on the clock and I gotta say that I am noticing a 1 to 1.5 MPG increase! Truck actually feels like it has less rolling resistance. I used Valvoline full synthetic in the transfer case..
How much did it take? I have a 2011 I am getting ready to do before towing this summer..
Jake 2250, you need to stay away from the 420!
I can guarantee the axle oil service netted you negligible mileage gain. Think about it. Going from pizza cutter hiway tires to bigger heavier mudders pulls 1-1.5mpg. Changing to a "better" gear lube may be good for .1-.15mpg.
