shell has reformulated the rotella. its not like the old rotella. just use regular oil, and and a bottle of comp/crane cams engine break in additive. or if you find it, joe gibbs or brad penn oil. they have the correct zddp levels already in it.
I agree to a point. Zinc has been pulled out of most oils including Rotella. Having just 2500 miles on a fresh 273 I'm using Valvoline Racing VR-1, 30 weight. It's a speciality oil and the government is allowing zinc to remain in these. I did the research on this. If you do go thru the engine I highly recommend Isky cam # 390144 solid lifter cam. Very nice lope run thru 2-1/2" dual exhaust, turbo mufflers. My Dart, 3 speed is getting 21 MPG.
Jim
