Quote:
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Originally Posted by FFRBob
Shell Rotella has a very high zinc content; even with the new formula, it's still quite high compared to other oils. For those with flat-tappet lifters, hydraulic or solid, the zinc is extremely important otherwise the tappets will wipe the lobes flat.
If you have roller lifters, then use your favorite oil.
I think that sums up the discussions  |
Actually, Mobil 1 15W-50 has more
zinc & phosphorus that the current formulation of Shell Rotella. If you don't want to use a
synthetic oil, the best way to go is to add some Comp Cams (or Crane) break-in
oil with every oil change.
BTW, I've personally used Mobil 1 15W-50 in both small block & FE Ford engines with zero leaks, wear, or problems of any kind for over 25,000 (hard) miles. Don't fall all the urban myths surrounding
synthetic oils. Actual scientific studies on this subject are nonexistent.
Z. Ray