I have a 2009 honda accord with the 3.5 v6 in it. I got it new in feburary and the owners manual says not to change out the factory fill till the olm says to. Says something about its a special break-in oil. Well it has almost 5000 on it now and its at 20% on the olm. i want to get it changed out with a good syn. i want to use amsoil 0w-20 but that probably wouldn't be good for warrenty. So anyone have any ideas how to keep the warrenty up and what oil to use? thanks a bunch