OK, since nobody took me up on the question about whether or not
synthetic oil is flammable, I'll tell you my findings (I thought this was interesting). I used to burn my drain
oil back in the days when I was changing my
oil regularly - the best & most environmentally friendly way to get rid of drain oil. Anyway, I could NOT get the syn oil to burn - no matter what! It would boil, but not ignite. I then tried burning a paper towel dipped in it, & it also would not burn. Then a few years later, I had my oil changed somewhere & paid extra for syn oil. Later when I got home, I tried the burn test & it lit right up. I figgered I got ripped off. Anyway, on my 300M from now on, I'll be supplying the oil at the oil change place.
And I
have heard about syn oil finding leaks, or even "creating" them. Not sure if I believe the latter. Also have heard that it will loosen deposits inside a motor if there are any, & that could be bad. I'm still not 100% sure if I'm going to switch. On a new car fine, but I'm a little apprehensive on a 100k+ engine.