The rotella t4 has 1200 ppm according to shell. Which is enough for flat tappet cams. The lucas muscle car oil claims to be 2400 ppm but is 3 times the price. It's around 42 dollars a gallon vs rotella is around 18 dollars a gallon. After the engine is properly broke in I wouldn't be afraid of the rotella. I probably will use it on mine after 3 or 4 oil changes.
