I have seen more than one cam lobe failure in vintage Porsche engines where the oil did not have enough ZDDP(zinc additive). I have also seen a cam lobe failure on a Lamborghini engine with dual spring valves also attributed to oil issues.
Being this is a tractor forum, I doubt one would see catastrophic engine damage by using a newer oil as long as the rating on the oil exceeded the original single vis rating.
So, based on the topical question it is a fact that some types of older engines have certainly been damaged by newer oils. Most vendors 'racing' oils have a ZDDP content above 1200ppm
Having said that, one of the byproducts of ZDDP in engine oils is high Phosphorus content also. A too high concentration of ZDDP and Phosphorus can lead to ring sticking, and brittleness and potential problems with exh seat and seal damage and cat damage as well. It's a balancing act. I use Valvoline ZR1 seems to be a good compromise. There are other brands.
This post was edited by docmirror on 03/14/2023 at 12:31 pm.
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