I personally dont think there is a difference between seating valves with synthetic versus dino oil. If there was then BMW and other manufacturers would not use it straight from the factory.
I think it is just more "lore" passed down through the ages... it is JUST OIL that has had its molecular structure modified. It is not different as it still lubes. It just resists the detriments of heat longer and maintains a consistent performance under widely varying conditions.....so better viscosity and protection. It is still oil though....nothing super secret.
Sorry did not read the post before mine....and I did not want to be my normally verbose self..
agree agree agree. Use the synthetic and dont worry.
