A 1985 Mercedes-Benz 300D Turbo has just 18K miles on its odometer and is in near-showroom condition. The car, which cost $31,940 when new, is considered a significant bargain now. It features a 3.0-liter turbo-diesel inline-five with 123 horsepower and 184 pound-feet of torque. Amenities include power windows, a four-speed automatic transmission, cruise control, a sunroof, and climate control air conditioning. However, the car's lifespan will be limited due to the changing nature of the sun and Earth's climate.