Will 75-140 gear oil reduce gas mileage 2mpg?
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11-06-2009 | 06:07 PM
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Will 75-140 gear oil reduce gas mileage 2mpg?
Hi all,
I recently did a fluid change on my 05 silverado 2500hd. (4.10 rear diff, auto 4x4)
I went to the local dealer who persauded me to buy there "4x4 service kit". This includes BG synthetic 75-140 for the front and rear diffs, and 75-90? for the transfer case. (the transfer case weight escapes me at the moment...) I also changed the tranny fluid/filter.
My mileage went from 13.2mpg average to 11.5mpg after doing this service. I have checked it over 2 tanks worth of gas now. Has anyone experienced this?
Thanks for input!
Jake
I recently did a fluid change on my 05 silverado 2500hd. (4.10 rear diff, auto 4x4)
I went to the local dealer who persauded me to buy there "4x4 service kit". This includes BG synthetic 75-140 for the front and rear diffs, and 75-90? for the transfer case. (the transfer case weight escapes me at the moment...) I also changed the tranny fluid/filter.
My mileage went from 13.2mpg average to 11.5mpg after doing this service. I have checked it over 2 tanks worth of gas now. Has anyone experienced this?
Thanks for input!
Jake
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