All motor oils have ZDDP which is a mix of Zinc and Phosphorus. The issue is they don't have the amount that they used to, plus there are some new low VOC ZDDP additives being used in oils that reduce the function of the product. Today normal passenger car motor oils have around 600 ppm of Zinc and Phosphorus, but they used to be for flat tappet camshafts at around 1600 to 1800 ppm.
For some years people were using the diesel oils for their hot rod and race car engines because it used to have higher levels of ZDDP, but with the latest changes it was reduced.
Now some oil companies like Joe Gibbs is making dedicated Hot Rod oil or you can purchase a small bottle of additive like from Rislone to use normal motor oil and boost it up to these higher levels.
But at the end of the day keep in mind not all engines need these higher levels. If you are running roller lifters, roller rockers and moly coated piston skirts, today's oils will be just fine.
For those older hot rod, racing or any other engine with flat tappet cams, especially with high spring pressure, you should have something in that 1600 ppm range.
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