I'm a landscaper and have an opportunity to purchase an E350 with a 7.3 Powerstroke and only 38k miles. I've never owned a van or a Powerstroke before. How much of a PITA are diesel vans to work on? Generally reliable? Any quirks I should know about? Although the mileage is low the van is still almost 30 years old--what sort of age related repairs might be on the horizon?