As good as it can be. I'm guessing a 7.3 non turbo, right? In late 94 they introduced the 7.3 TDI Powerstroke. They also offered a turbo and non turbo version. If the 93 you are looking at was built in late 93 it could have the ATS turbo on it. To give you an idea of mileage, my 94 PSD got better mileage with a 6500 load behind it than a friends crew cab turbo 7.3 got unloaded. Both 5 speeds, mine is an extended cab 4x4, his a 2wd single rear wheel. With the non-turbo 7.3 you can expect less. Personally, unless you are getting a really good deal, I'd hold off for one a year later.
I have a 91 f-250 with 7.3 deisel and e40d. I bought it with low compression and will not start. Expensive to rebuild. 205 for engine gasket set with out the intake manifold metal gasket. 350 for injector pump, 28 per injector, 200 + for rings (dealer wants 60.33 per cylinder for rings), Got heads rebuilt for 190 though. needed new valve guides and 1 exhaust valve, 360 for a starter, and still need a flexplate and reseal the trans. So what I am trying to say is if you get it maintain it. change the oil very often. and make sure the flexplate is not cracked. can't wait for mine to fire up.
I have a '90 F250 4x4 7.3L (310,000 km) with a ZF5 and other than the fuel system bleed down problem I had two weeks ago it runs great and has plenty of power. Last week I had 1500lbs of moss in the back and the suspension hardly moved.
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