How often do you plan on oil changes? On the Diesel with synthetic you should be good at 7,500-10,000 mile changes. I think you're right though... if you have a good running car that will last why trade it for something else.

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1985 300D Turbo ~225k
2000 F350 (Powerstroke) 4X4, SWB, CC, SRW, 6spd ~148k
1999 International 4900, DT466e (250hp/660 ft/lbs), Allison MD3060 ~73k