3 litre patrol problems

Hi there, I've been looking around and seen quite a few 3.0 turbo diesel Gu patrol's in my price range (up to $6,000) and they look in decent shape. One I have found is a '01 with the five-speed manual and a few mods on it (decent 4wd tires, roof-rack, awning, high-lift jack) and 300k on the...