My machinist was very adament about using an oil with high level of ZDP (Zinc). I used the 800# for the Shell Rotella Tech line, and they admitted they have cut way back on the zinc to meet the new emissions requirements for the new over road trucks. They still have a small amount of zinc.
The easy option is to use an off-road diesel rated oil in your favorite viscosity. The off-road equipment does not have cat converters and still has sufficient zinc. The second option is to buy a special racing oil (can't remember the brand, it is not on any normal store shelf). He has seen a lot of new cams destroyed by the lack of ZDP. Look up the Crane cam site and see their recommendations.
The old answers we have trusted for many years are now a plan for failure with a newly rebuilt engine. Do diligent research, you have paid a lot of $$ to get that engine rebuilt. You want it to last a long time.
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Today's Featured Article - Product Review: Black Tire Paint - by Staff. I have been fortunate in that two of my tractors have had rear tires that were in great shape when I bought the tractor. My model "H" even had the old style fronts with plenty of tread. My "L" fronts were mismatched Sears Guardsman snow tires, which I promptly tossed. Well, although these tires were in good shape as far as tread was concerned, they looked real sad. All were flat, but new tubes fixed that. In addition to years and years of scuffing and fading, they had paint splattered on
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