Originally Posted by Mike B
After installing a new cam and lifters in my 1957 322 V8 my engine builder asked me to run Shell Rotella T 15w40 with Erson Cam ZDDP. He says it's cheap insurance and since I'm not an oil chemist and don't want to have issues I'll follow his advise. He's been re-building antique car, truck and tractor motors for over 40 years. I've put almost 9,000 miles on the new cam, so far so good!

Mike B smile

When was it he told you that? My understanding is Shell Rotella changed their formula too.

Again, do your own due diligence and check the oil each time you buy it. If it doesn't state that it is compatible with flat tappet cams, proceed at your own risk.