I have a question for you gentlemen out there. Let's know that I am going to view used tow vehicles, cars and trucks... Not being savvy in veh. engines and such, especially diesel, how do I determine a good vehicle from a lemon? Who can I consult to examine what I find to determine if it is as advertised? I'm not sure if I should buy diesel or gas yet, so either is a possibility. Outside the just sold Toyota 89 4 cyl MH, I've never bought anything but new vehicles: My 300ZX lasted & looked like new for 18 years, a turbo yet. I never had one engine repair in all that time. So, I don't want to get stuck with a lemon because I know nothing about used engines. I need some advice.. like who should I get to inspect whatever USED vehicle I've found.. whether gas or diesel.. I live in the Knoxville area of TN. Women have been notoriously gypped by sellers who know that we are not experts in engines and performance. Any comments, or advice?