I've got a problem. Done some searching on the site but couldn't really find the solution. The noise is definitely top end, between cylinders 4 and 6, noticed performance loss before tick started, and I don't know what to do. Do I need to replace lifters? Someone online said it could be blocked oil passages so I just need to drive it with Marvel Mystery oil or something like it. How much damage could I be doing by driving it though?
