Originally Posted by Storm Chasing Ford
I have Royal Purple 10W-30 in Thunder and the engine makes no noises and runs great! I'm going to keep using that for my oil. Also, gonna try the K&N oil filter as well...
I've been using Royal Purple 5w-20 with a K&N oil filter since the first oil change at 3,000 miles and every 5,000 since. I've been considering on switching to 10w-30 now that I'm at 120, 000.