Quote:
Originally Posted by Arminius
Consumer Reports found no measurable difference in FE or the amont of particulates in the used oil.
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Are you talking about the one they did 15 years ago on taxis? Not the greatest study ever done.
Synthetic engine oil can give a few % better gas mileage (about 2% is the norm).
The thing that will really impact mileage is synthetic transmission fluid and/or differential fluid. On my automatics there are 15 quarts of fluid in there, that's a lot to get pumped around!
However, if you want to try synthetic engine oil for better mileage I'd recommend two treatments of
Auto-Rx Engine Cleaner first in conventional oil and then follow it up with a PAO (not group III) synthetic. I'm a big fan of
AMSOIL's ASL 5w30
Here's what I mean by PAO/Group III:
Synthetic Motor Oil Gets All New Semantics - Column/Patrick Bedard/C/D Staff/Columns/Features/Car and Driver - Car And Driver
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