my question for you is are you getting better gas mileage w/ the amsoil? have looked into getting it myself. and a FYI: the reason for oil leaks to appear w/ a fully synthetic oil over a dino or semi is the fact that these oils break down and help fill any gaps in the seals. a full syn will not break down and clears this sludge away that is filling the gaps...hence why you get oil leaks w/ a full syn. | 
