Quote:
Originally Posted by ukiltmybrutha
Does thinner ATF have a measurable effect on fuel economy in an automatic transmission?
Thanks.
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In general: Yes. It is amazing how much of our fuel economy targets are hit with new fluids (Engine oil, Transmission oil, Differential oil) It is also maddening for me since I have to install storage and dispensing equipment in a bunch of assembly plants.
In practice: Run the fluid recommended by your manufacturer. It takes us more than a year and millions of miles on dynos, test tracks, and road testing to certify a new oil. There are a bunch of little tweaks that have to be made to use thinner oils. Changes to bearings, seals, oil passages, etc.