Garage-Kept 1980 Cadillac Coupe DeVille Diesel With 33k Miles Surfaces

A two-door 1980 Cadillac Coupe DeVille has turned up for sale in Poughkeepsie, New York, and its most unusual feature isn’t the color — it’s what sits under the hood. This particular example is one of the rare diesel-badged Coupe DeVilles, and the seller claims it has covered fewer than 40,000 miles while sitting in storage since 2006. The asking price is listed at $11,500.

The engine in question is a 5.7-liter diesel V8 derived from Oldsmobile hardware. Its reputation among enthusiasts is, to put it kindly, troubled. The design was rushed into production, and blown head gaskets became a well-documented headache; many surviving cars have had their original head bolts replaced with upgraded aftermarket pieces as a preventive measure. Output was modest — roughly 105 horsepower and 220 lb-ft of torque — paired with a three-speed automatic, and the run to 60 mph took well over 20 seconds. For a car wearing the Cadillac crest, that figure was hard to swallow even in its own era. Whether this specific car is mechanically untouched beneath the hood is unclear, though the cabin presents as remarkably factory-fresh.

The cosmetics tell a story of careful stewardship. The pale yellow paint is a period-correct shade and appears to be in strong condition, with clean bodywork on both flanks. Given how much snow the Hudson Valley receives, the lack of visible corrosion suggests the car was kept away from road salt. The original hubcaps still hold their shine, the chrome mirrors look sharp, and a thick layer of dust points to long-term indoor storage rather than neglect.

That said, a car that has sat for nearly two decades is a project regardless of how well it was kept. Two and a half decades in New York’s climate creates real rust risk, and the listing photos reportedly don’t offer enough close detail to rule it out. The low mileage may be a genuine sign of preservation — or a sign that the original owner simply grew tired of keeping it on the road.

Diesel passenger cars of this vintage occupy an odd corner of American automotive history. Government pressure for better fuel economy pushed GM toward oil-burners at a time when the technology wasn’t ready for mainstream buyers, and the fallout soured many Americans on diesel for years. That legacy makes a low-mile survivor like this a curiosity more than a collectible. It will need the right buyer — someone who appreciates the oddity, is prepared for deferred maintenance, and won’t mind the leisurely acceleration. For the right person, though, it could be a compelling conversation piece at a weekend car meet.