I have about 107k on my SUV. I have religiously followed the maintenance and service schedule since I bought it new. In trying to decide whether to look for a replacement or keep it, I was wondering what factors might come into play. I thought that a complete engine/car diagnosis might yield some information upon which to determine whether to sell or keep. Do you agree that diagnostic checkup by either AAA or a Lexus dealer is the way to go? Do you have any alternative ideas to offer? Thank you in advance for any light you might shed on this matter.