MolaKule
Staff member
That's because most engine oils being discussed are designed for terrestrial vehicle engines, not aviation engines, which seems logical to me.Neither is P66. I’m asking why is it relevant that one oil is highly regarded here that has no API certifications and another oil isn’t and the reason is it has no API certifications. That is illogical.
One should never use a terrestrial vehicle engine oil in an aviation engine and vice versa.
Aviation engine oils, whether gas or diesel, have vastly different requirements for base oils and additives compared to terrestrial vehicle engine oils.