synthetic oil comparison

[markjohnson]

I've been using Rotella for the past six months after the big reduced-zinc content scare became common public knowledge. I used Mobil One for 20 years before that but they took the ZDDP out of it too. I've done a lot of reading on this subject and in 2007, diesel oils such as Rotella are slated for reduced ZDDP content. So I wouldn't get to used to putting it in the old cars. So now I'm onto Valvoline Racing oil 20W50 and for added measure I put in a small bottle of GM cam and lifter oil prelube at every oil change. Just did a large solid lifter camshaft break-in recently with monster valve springs and everything seems to be fine so far. Fingers crossed.