Been lookng at a couple of these lately, thinkng about taking the plunge. Any thoughts on the motors and electronics on these? Any known issues, anything I should be looking out for? Gas mileage? The ones I have been looking at have the 2.6 V6. Any thoughts at all will help.

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1996 E300 D
1992 300D
1990 Ford E-350 7.3 Diesel AKA "the Deep Fryer"