Wait till you've owned a car as long as I've had my Corvette. At this point I leave the keys in the ignition and hope someone makes off with the old pig. It sounds to me like you're not done yet, don't sell it. Some decades back I thought I was done with the old Vette, I stuck it in a rented garage for 7 years then pulled it out and resurrected the old sled. I think I'm done again, WTF! It's a conundrum to say the least. I would suggest that owning your TD for just 15 years with the few miles you drive it is no where near done from my perspective.

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1981 240D Four on the floor, Orient Red over Parchment, bought with 154,000 but it's a daily driver and up to 180,000 miles, mostly original paint and all original interior.