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Originally Posted by IbenTruitt
I was told by a Ford factory rep that using the 5w20 increased your gas mileage by 1/2 of 1 percent. Now try to figure out how much that would be. ;-)
He also said that extending your oil change interval because you were using synthetic oils was a no-no and would void your warranty. As long as the oil meets the specs listed in your owner's manual the use of dino/syn oil is up to you.
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I know a mechanic who uses synthetic motor oil in his 02 F-150 and he pushes it up to 8000 miles bewteen oil changes. I'm not quite comfortable doing that with my truck, but he tells me that going only 3000 miles with synthetic is pointless because I am wasting the oil's true potential.
I appreciate all of you for your input.