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A 1987 Buick GNX can sell for very different amounts depending on mileage, condition, originality, documentation, and sale history. The latest specifically verified result here is $427,000 for a 30-mile example sold on September 24, 2026. That extraordinary near-new car is not a typical price for a GNX with ordinary use: an 82,000-mile example sold for $101,987 in January 2025, while a 49,669-mile car sold for $107,000 in October 2025.
These are individual auction results, not a formal appraisal or a statistically representative market range. Treat each price as a dated transaction tied to a particular car—not a guaranteed value for another GNX.
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What recent 1987 Buick GNX sales show
| Example | Reported sale price | Sale date and venue | What the result tells you |
|---|---|---|---|
| GNX #450, 30 miles | $427,000 | September 24, 2026, Bring a Trailer | A near-new example achieved an exceptional result. It had previously sold on the same platform for $220,000 and $200,000 in July 2024, then returned through a dealer; that history cautions against treating the latest result as a predictable value. Bring a Trailer sale listing |
| 82,000-mile GNX | $101,987 | January 30, 2025, Bring a Trailer | A substantially higher-mileage example sold for far less than the 30-mile car. Bring a Trailer sale listing |
| GNX #244, 49,669 miles | $107,000 | October 16, 2025, Hagerty Marketplace | The seller described the car as largely original but also disclosed performance and reliability modifications. The listing also described original sales paperwork, a window sticker, service records, and a clean CARFAX report; these are seller-provided listing details, not a general guarantee about GNXs. Hagerty Marketplace listing |
The three results do not establish a mileage-based pricing formula. Mileage is one important point of comparison, but these examples differ in condition, originality, history, and sale context as well.
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Why the GNX commands collector interest
Buick built 547 GNXs for the 1987 model year with help from Michigan-based ASC and McLaren Engines. General Motors describes the short run as a collaboration: “Sold briefly in 1987, the GNX had a limited run – Buick only built 547 of them, with the help of Michigan-based companies ASC Inc. and McLaren Engines.” General Motors’ history of the GNX, published February 17, 2025.
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Hagerty’s 2025 valuation report describes the GNX as the ultimate Grand National. It reports a blueprinted turbocharged V6 rated at 276 horsepower, a 0–60 mph time of 5.5 seconds, a quarter-mile time of 13.43 seconds at 104 mph, and a GNX package price of $29,900. Those are historical figures reported by Hagerty, not current performance testing or a 2026 appraisal. Hagerty’s 2025 GNX valuation report.
What to check when estimating a GNX’s value
Mileage and preservation
The examples above range from 30 miles to 82,000 miles, with markedly different sale prices. That contrast shows why mileage matters, but a handful of transactions cannot tell you how much a particular number of miles adds or subtracts. Look at the car’s overall condition and evidence of careful preservation alongside the odometer.
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Originality and modifications
Confirm what remains original and what has been changed. The seller of GNX #244 described it as largely original while also listing performance and reliability modifications. A buyer should distinguish a seller’s description from details supported by records, photographs, or inspection.
Paperwork and ownership history
Look for records that support the car’s identity and history, such as original sales documents, a window sticker, and service records. A clean vehicle-history report may be useful, but it does not replace a close inspection or establish that every aspect of a car’s history is complete.
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Completed sales and timing
Compare completed transactions with stated mileage and sale dates, rather than relying on asking prices. Also consider a car’s prior sales: the 30-mile example’s repeated transactions show that one later result may reflect a specific sale context, not a stable value or a forecast of future returns.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How to use these prices
If you are buying, selling, or evaluating a GNX, use these results as reference points rather than as an appraisal. Match the candidate car as closely as possible on mileage, condition, originality, documentation, and sale circumstances. For a consequential purchase or valuation, arrange an independent inspection and seek an appraisal that addresses the specific vehicle.
Quick Recap
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
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