Hey guys...thanks for your responses...What I've gleaned from your replys is simply that Syns aren't all that they're cracked up to be...I guess that my next oil change will be to Castrol 10W-40 Dino, which ironically is what I had been using since I purchased the car a couple of years ago...sometimes I guess we (I?) over-analyze some things to the point of mass confusion...as always, the KISS principle works after all...thanks, Bill