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My engine builder said newer oils have removed a lot of the pressure-wear additives necessary for flat-tappet engines. Modern engines with OHC don't need them, and also for smog reasons.
Run an oil (like Rotella T) that's certified for BOTH gasoline and diesel engines. Those contain the pressure-wear additives.
There are both synthetics and dino oils with diesel/gas certs. Rotella (shell) makes one, but I've found it hard to find the full synthetic Rotella T . Frequent changes is the key -- Consumer Reports tested this a few years ago.
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