A friend of mine needs cash and has a 2500 single cab 4x4 auto that he doesnt use. I dont know much about these trucks but Im interested because $4000 seems like an alright deal. So far I know that it leaks oil and possibly fuel. It is wet and dirty all around the driver side injectors or valve cover. The glow plugs wont start it, but the block heater will. Also last month the interior started to grow mold from a possible leaky windshield. My questions are... Is this a good deal? What all can I check for when I go to test drive/pop the hood? I am going to take it for about an 80 mile drive.