my car is about 4 days old. i plan on changing the oil between 750 and 1000 miles to get any shavings out of there. is that a giid time? at what milage should i switch to synthetic? should i do it then or is that too early? also i have seen the reccomended oil is 5w40... that's what the car comes with... what brand is that? also many people goto 5w30 because 5w40 is hard to find... i checked the online oil bibles numbers for 5w30s (you can do a search for it online) and it says amsoil is number one over mobil 1, which is number 2 by the numbers... it mentioned nothing of 5w40s? why? it did list costrol syntec under a 5w50... anyone tried that? any info would be helpful... also, i saw the link today to steer from mobil one now since it is now not a full sythetic someone head mentioned... is that correct?