I owned a 2002 Magna, had it for 6 years, and finally sold it in 2007. My coach had almost 80,000 on it when I traded it in. The engine was solid as a rock, used no oil, and would probably be good for another 500,000 miles. Mine happened to be a cat C12 engine. I have a close friend who also bought a 2002 Magna with the same engine. He still owns his today and has close to 150,000 miles on his engine. His entire drive train (engine/xmission/etc) is all working just as they did when he bought the coach new. In my opinion, the 2002 Magna was probably one of the best coaches made by Country Coach for the price. I would have it today had it not been for a major problem with the slide out. In 2002, Country Coach experimented with a few Magna's on using all electric slide outs. Unfortunately, I had one of the few. In my case, the main structural support for the kitchen slide severed. No one knew how to repair it. Unfortunately, Country Coach had just stopped repairing older coaches and were only handling warranty problems.
If I were looking to buy a 2002 at this time, I would ask if the slide out was electric or hydraulic. That is probably only because I had such a bad time with mine. Most people will tell you (even the slide out manufacturer of parts, HWH) that Country Coach did not make any electric slide outs on the Magna. They did. Interestingly enough, even all the documentation that came with my coach when I bought it, said that it was a hydraulic slide out system. By the way, my coach number was 6128 and I believe Country Coach only made around 10 with electic slide outs.
All in all, the 2002 Magna was by far the best coach I have ever owned. As I said earlier, I would still have it today had it not been for all the major problems I had with my slide out system.
Hope this is helpful. If I can answer any further questions, I will be happy to try.