I usually use penrite 10w-50, my car has high k\'s. can\'t rate the stuff high enough, good oil full syn, and was on special at repco just last weekend for $48. Not sure if it still is though. But for track day I\'m gonna use a racing oil I got from agip, it\'s a 10w-60. Work paid for it, not that they know yet haha. Also a good thing to note not sure if it\'s been mention here yet, is the letters that come after the rating, further down the alphabet the better, but also dosnt last as long. Cause it will have more conditioning additives.