another 2 cents worth.......!
Owners running roller cams on Mobil I, or not using something like ZDDP, with soon see roller and cam wear. Just because it is a roller, does NOT mean high loads and not present.
Valve spring pressures are higher, sometimes MUCH higher, and this put extreme loads on the small needle bearings, rollers are narrow as compared to a flat tappet lifter, and this can wear both cam and roller lifter.
This is not just an opinion, as we have various roller cams and lifters in the scrap pile as testimony.
No one seems to recognize that the side loads on pistons on a blown engine are high, especially at the higher RPM's, especially since most all are using a roller cam.
This is another place where the additive works extremely well.
Just my opinion on the Joe Gibbs break in oil since I have no personal experience with it. From the research I have done, there are 2 things that make it "different"?
First it has elevated amounts of ZDDP, which you can easily get from one 4 oz. bottle, and it has less detergent to keep oil on the cylinder walls. Is this worth the crazy price just for an hour or 2 of run time? Even though we build engines well in excess of $20k, don't see any difference doing break in, even on a dyno, with regular oil and ZDDP.
