I'd fear all of what Geoff said+look for blue smoke from tailpipe or take some oil and pay 20 bucks for an analysis.My best friend works in fleet maintaince,and they get tired at 150K with great maint. practices,look for a lot of diesel fuel in the oil on the analysis.Make sure it starts good,might need glow plugs or a controller.Valve cover leaks are common and a pain in the a$s to fix.Sounds like a good work truck-<p>----------<br>John D<br>