hi i'm new to the club and thinking about buying a 1991 ls400. it has 150,000 miles on it but is a strong running engine. my concern is that when i started it up, white smoke came out of the exaust and continued to smoke a little while the engine was running(about 15min) but no as much. my other concern is that i heard a ticking sound coming from the engine. question...would a oil change and intake cleaning fixed this. i planned to have the car checked out this week. any comments or advice?