I own a 2000 Cadillac Seville SLS. It has 147,000 on it and runs great. It has the normal cold engine knock when it is cold and the WOT have not helped. I have gotten used to the noise so it really doesn't bother me knowing there is nothing wrong.It also has somewhat of a knock when I first pull out but I have heard this is also normal and nothing to worry about. It's just part of having a Northstar. It uses no oil and it doesn't leak a drop. To look at the car it looks like it just came off the show room floor. The only way you can tell it is high milege is the front headlights have dulled from the bugs and stones that have hit them during the many miles of travel. The seats are perfect and it still smells new. The maintence has always been done on this car and I truly believe thats the secret to the longivity of any machine. I have owned many Cadillacs and this is my favorite.