We have read that synthetic oil protects and preserves internal combustion engines much better than does natural petroleum. I have proven that to myself over many years in my own vehicles. A question first came to mind the last time I bought synthetic oil...I noticed that it is so much lighter in weight per volume than petroleum that it begs a question ....is at least part of the reason little to no wear occurs in an engine using synthetic oil due to more of the synthetic material remaining on the moving components after operation ceases and the engine cools, at least partially due to the lower gravitational pull on the lighter sythetic oil allowing it to remain on moving components better than heavier petroleum? If so, it would logically provide superior cold start-up lubrication, the lack of which is the cause of most engine wear. Thus, is the superior protection of synthetic purely due to its superior lubrication qualities, or does it possibly involve other factors such as the above? Thanks for informed responses.