If you have a flat tappet cam talk to your cam manufactorer and take there advise. The API ratings on oil are no longer reverse compatible. They will state otherwise but don't beleive them. The cam shaft manufactorers have seen a hugh increase in warranty claims due to cams going flat and there research brings it back to the oil and it's additive package. The tree huggers and emmission standards have caused the new oil to have additives removed that protect your flat tappet cams(EP additives like Zinc & Phosphorus). Google "cam shaft failures oil additives" and start reading. Rotella use to be CI rated but is now CJ rated and not as good for flat tappet cams.
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Ted Rea
"Don't drive FASTER than your guardian angel can fly"
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