Originally Posted by Dragsix
Shell Rotella no longer has the zinc and phosphorus package that it once had.
All the diesel oils got zinc and phosphorus reduced a while back. I think it was when API CK-4 spec oil came out. But I believe they still have as much zinc and phosphorus as common gasoline engine oils.

Kevin
1951 Chevy 3100 work truck
Follow this saga in Project Journal
Photos
1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car)
Busting rust since the mid-60's
If you're smart enough to take it apart, you darn well better be smart enough to put it back together.