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Originally Posted by SunfireRaz
Ok. I saw in the "sticky where K&N air filters were busted for aiding fuel economy.....I think I also saw where the syn oil was busted.....I got an additional 40 MPT out of my sunfire after changing to syn oil and installing a k&N...Help I am confiused.
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Whoever wrote that about synthetic oil was wrong, that's all. Reduce friction, improve efficiency. That's well documented elsewhere. I use the thinnest synthetic I can get away with, in the engines, transmissions, power steering, rear end, etc, and that does work.
As for K & N air filter, that certainly isn't going to help mpg unless you happen to be replacing a badly plugged paper filter with it.