I was talking to a co-worker the other night about this and he said he uses M1 on his Buick Regal and changes every 7,000. I asked him if he checked the oil to see how it looked after that long and he said he's never checked it, just goes and gets it changed. Like mr froge said it's a little more for the amsoil but with it designed to go so long you don't mess with drains half as often. Guess I'll have to figure out what I'm going to switch to. I'm going to call around and see if any parts stores have it here local. Thanks for all the info guys!
