And everyone that does have said unicorn knows it--so they will keep it forever or price it accordingly when they sell it.
...and rightly so, for us that purchased Ford diesel vans new, we paid big bucks for the engine. Even so, to try and recoup a fraction of the new purchase and operating cost when selling used, the original owner would have to drive it zillions of miles and still tack on a premium for the diesel engine.
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I'd gladly pay a premium of $5,000 for a used low mileage, good condition diesel Van. One could easily make the case that 'such' a Van cost the original owner up-wards of $10,000 more to own and operate over a gas engine, even with getting an additional $5,000.00 used sale premium.
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FWIW best cost savings when buying our new 2009 Ford van cutaway 6.0L Diesel, was to purchase the maximum extended 7 years Ford warranty for $3,400. Rough estimated of repairs so far exceed $10,000, for 3 year and 39,000 miles.
Replaced turbo, water pump, cooling fan, air conditioner leakage twice, high pressure fuel pump, pulled engine to fix oil leak.
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With all the repairs I was beginning to hate the noisy smelly beast, until last week, remember why I got a diesel; while on vacation and cruising down the wide open Interstate Highway in North Dakota at 85mph, towing a Jeep JKU, with the diesel chugging along and passing all the other Motor-homes like they were standing still. Yep... I'm addicted to them-dar expensive Unicorns!