Just for giggles related to the original post on diesel oil.
Amsoil actually makes a high zinc oil that is multipurpose and compatible with diesel and gas engines. This formulation is made for heavy duty use and states works well with flat tappet camshafts specifically with higher tension valve springs.
Anyway, for those that don't want to lube their gas engines with diesel oil, here's one oil advertised for use in both.
https://www.amsoil.com/p/premium-pro...-motor-oil-aro
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