Tim, The best discussion board I have found for the Ford powerstrokes is at: Link click on discussion boards at the left, go to the "Powerstroke Only" board. Lots of very knowledgable posters for those engines. Be carful of the new style fuel filters - the cap and filter cartridge all in one piece. The first time I changed my fuel filter I used one from AutoZone, had diesel all over my driveway after I started the truck. You can get parts for that engine, including the old style fuel filters (cartridge separate from the cap - use the cap that came on the canister with the truck) at International truck dealers, usually substantially cheaper than at Ford dealers. Also, if she has not been doing it, she should be using a coolant additive in the antifreeze to prevent cavitation (if you don't know what that is, go to www.howstuffworks.com and look it up - maybe explained in the diesel engine pages). I think the owners manual gives the Ford part number, but again, just ask at an International Dealer and they will know what you need.
Good luck. Tim
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