i bought this xf at 16,000, it has always done this, even after a fresh oil change...every 7,000 miles here. i know how the oil sits in the oil pan and the lifters dry out from sitting. just wondering if this will eventually damage the lifters. when i start it i don't go anywhere til the engine revs down on its own, about 30 to 60 seconds. anyways, just curious...BTW love this board!! you all are great!!...benji