parksey i had the same prob vs a mondeo 2.0 TDCI, but to be honest ST vs an X3 no chance for the ST, if it were me i of would expected for the X3 the be hard to get by, all that torque for that big thing!!!!!!!! i have had my car from january now, and to be honest the i cant tell differance from the day i bought it to today, still drives the same still goes the same, but i did notice the car was really really slugish in all the hot weather