full synthetic

From my understanding old R22/12 equipment used Mineral, which seems to mean non synthetic base 3 or less or Alkylbenzene base. New R410a equipment seems to be POE in hvac and PAG in 134a/automotive, with R1234 using POE sometimes.... Apparently they don't mix well with non chlorine based...

Okay full disclosure this is my first post here. I KNOW oil is a very intricate and highly debated aspect of engine performance, but I am still in the infancy of learning vehicle maintenance and repair so go easy on my naivete. My question goes slightly deeper than what's the best...