mobil 1 5w30 with a motorcraft fl820s filter. the k&n filters are also good however the motorcrafts can be had for 2.97 from the wal mart. the 4.6 motors like synthetic. usually about a 5000 interval is good on them, a little more frequent if u race it often.
Mobil 1 5w30 w/ mobil 1 oil filter, got a deal going at autozone for 5 quarts of mobil 1 + mobil 1 filter (which is $12 on its own) for $29.99. Anyways, had to buy a separate quart of mobil 1 after I found out these things take 6 quarts. (first oil change)
haha, they better be good for the price they charge for 'em. Like I said, the ONLY reason I got it was because it was practically free. The oil alone usually costs $30