Malcb, You're probably right. On any car that didn't have a "unit body" construction like most cars have today, they would tend to "fold" when the doors were opened while the car was jacked up in one corner, especially roadsters. If one was to open the door while it was jacked up, in many cases, it would not close again until the car was put back down on the ground. I just assumed he was told this about his XF, because there seems to be so much mis-information going around about these cars. Most of it coming from dealers who know nothing about the cars they are selling.