i switched to mobile 1 and had nothing but problems. it burned a lot of oil when previously burned hardley none and had the camshaft seals blow. i replaced them and they blew again. the motor had a lot of miles on it so i replaced it with one that had 44k. ive been running casterol synthetic blend. i have had no problems at all. the last oil change 2k ago i changed to casterol syntech a full synthic oil. now its burning oil again. does anyone else have any problems with full synthics? or am i just unlucky?