Oil threads are usually very opinionated and the answers are almost always "I use xxx because I've never had a problem, my dad/uncle/wife/pet mechanic/etc etc etc...... used it, ad-nauseum.
For break in, it's pretty good to do what the camshaft manufacturer/grinder suggests.
I stay away from Diesel oils because they are formulated for Diesel engines.
That's for the most part NOT TRUE. Just about all diesel oils are certified by their own manufacturers and the SAE to be dual use. I.E: SF/CD, SG/CE, etc.
For example, Chevron Delo 400:
Select Performance Specifications
• API Service Categories, including CI-4, CH-4/SL
From Wikipedia:
Current API service categories include SM, SL and SJ for gasoline engines. All previous service designations are obsolete, although motorcycle oils commonly still use the SF/SG standard.
Most of the oil companies do not make their own additives. Those are made by Lubrizol, Shell Chemical, Castrol, and only a few others.
Oil companies do a LOT of trading. Buying Chevron base oils might get you oil from any manufacturer in a Chevron container. Buying Royal Purple, Super Secret Owl snot, Double Slicky Sticky, or any other "name" might also get you Chevron base oil and Lubrizol/Shell/Castrol additives.
Oil and gasoline are probably the MOST heavily marketed products on the planet.
Either use what the cam manufacturer suggests or what ever makes you feel good. Either will probably do the job!
Cheers,
Rick
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1955 F-600/272/E4OD// Disclaimer: No animals were injured while test driving my F-600 except the ones I ran over intentionally!
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