i am currently using it. works fine, but i don't trust it and will change it out.

i don't trust it for a reasons that probably has nothing to do with the oil. my previous engine had a rod bearing go bad while i was using the mystic.

i'm using it now because i had an 8qt bottle laying around and put it in my transplant engine to see if it was a good engine.

that mobil delvac was in my old engine when i began its baby knocks. ran the mystic to see if it was the oil and if the knock would go away. with both oils the engine sounded and ran the same. rod just went with the mystic.

answer is it wasn't the oil. i still have bad feelings about them... but would/might use them again. just a rant.