When you are looking at a previously owned Ford or International diesel, ask the owner if he kept up on the coolant additive. A post above refers to it as F15; it might be FW15. There are also International products that are the saem ( it is their engine after all).
Watch the owner's reaction. If you see a "cloudy" look in his eyes, followed by a quick " Yeah, we did everything", or if he says. " What coolant additive?". Keep your hand on your wallet and leave.
These International enginer are great, but they are susceptible to cavitation UNLESS the owner maintains his coolant additive package.
AFAIK, there is no way to inspect for cavitation. You can check the protection in the coolant right now, but you can't know whether or not it was maintained for the life of the engine.
If you see that the previous owner has added a coolant filter with a dispenser for the additive, you got a good one, ( most likely).

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1982 300SD " Wotan" ..On the road as of Jan 8, 2007 with Historic Tags

I think in 02 they switched over to the Gold coolant which you don't add the stuff to. There is a post out there somewhere that tells us that if your engine serial number is over a certain number, you can switch to the gold stuff. I checked mine and flushed out everything and put gold in so i don't have to worry about the additive FW15.

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01 Ford Excursion Powerstroke
99 E300 Turbodiesel
91 Vette with 383 motor
05 Polaris Sportsman 800 EFI
06 Polaris Sportsman 500 EFI
03 SeaDoo GTX SC Red
03 SeaDoo GTX SC Yellow
04 Tailgator 21 ft Toy Hauler
11 Harley Davidson 883 SuperLow

They have had ALOT more than just turbo troubles..... The package cars at UPS had head troubles and internal oil galley problems.

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My Truck.. 2007 DODGE, 5.9 Cummins, 6spd stick, 4X4. My car..1977 240D, OTHER WHEELS...1955 VW Oval window bug, European Delivery (Holland) with a 1700cc, 2 barrel, Porsche drum brakes. 1939 WILLYS Pick-up. 1967 Triumph 200cc Tiger Cub. 1976 Honda 550F 4cyl Motor Cycle.