I've been looking at diesels for some time and I want one, but I dont know a lot about them. I've been reading a lot on different forums. A friend at work is selling his 89(maybe 88?) f250 4x4, ext cab, 5 speed with about 236k miles for $3200. It has new tires and looks great, new paint about 3 years ago that looks almost new. There aren't even any noticable tears/rips in the upholstery. He bought it new and has maintained it very well...new g plugs, brakes, and fuel pump just recently. I haven't driven it yet, but he says it has no problems except the ac isn't working. It's an xlt with all the options. Is the price he's asking good? What should I look for and what do I want to avoid? I've read about what to look for when buying 94-97psd, does the same apply? should I check sca levels, etc? anything to look for in the oil? I'm planning on spending the cash to put a turbo (probably ats or hypermax) on it, any suggestions? Any help would be greatly appreciated!!!