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Old 08-02-2008, 11:19 AM   #19 (permalink)
darkdan
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Quote:
Originally Posted by Arminius View Post
Consumer Reports found no measurable difference in FE or the amont of particulates in the used oil.
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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