There are very few products available with the levels of zinc and phosphorus that you are looking for. The old timers are right about diesel oil, but today's CJ-4 rated diesel oil is not acceptable for your application. The exhaust after-treatment systems cannot function properly with those minerals. You need a CI-4 or earlier type oil, rated for the older diesels. You can probably find some bottle stock out there, but pay attention to the label. Don G is right about the Rotella-T. It's the only oil on the market with acceptable levels because (for now) it is most commonly used in tractors. There are no good additives available unless you get into the racing stuff, and that just doesn't pay off.
