I dont think it caused it though after reading my post again it sounds like i did. sorry. The car is much quieter after i installed the bushings. I really am partial to shell products( My Dad had 3 shell stations back in the 70's and 80's)and want to change my oil back to a sopus brand. any suggestions? im going to start another thread and see what yall think. Thanks NO DISRESPECT to Redline Oil. after i read alot of posts about these rocker trunnions failing im sure it had nothing to do with the oil.