Some cars age and others simply become more expensive to own.
asserted
others → age → ?
A 1987 Buick GNX with barely 30 miles on its odometer has demonstrated just how dramatically collector demand can shift, selling for $427,000 after changing hands for $200,000 only two years earlier, states an online report by Bring A Trailer.
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report → demonstrate → Trailer
The black performance coupe, number 450 of just 547 GNXs built for the model year, has covered only four additional miles since its previous sale, adds the online report.
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report → build → sale
According to September 2026 report by Bring A Trailer, the GNX previously sold on Bring a Trailer in July 2024 with 26 miles on the odometer.
uncertain
GNX → accord → odometer
It has since been acquired by the dealer now offering the car in Texas, with the mileage increasing to just 30 miles.
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mileage → acquire → miles
The latest transaction more than doubled the car's previous sale price, highlighting the premium attached to exceptionally preserved examples of one of the most sought-after American performance cars of the 1980s.
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transaction → double → 1980s
The car comes with manufacturer literature, memorabilia, copies of its original window sticker, a clean Carfax report and a clean California title, adds the report.
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report → come → sticker
Built to end the Grand National era
The Grand National Experimental, or GNX, was developed as a final celebration of Buick's Grand National production run.
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Experimental → build → run
Buick partnered with McLaren Performance Technologies and ASC to turn the already formidable Grand National into a limited-production performance model.
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Buick → partner → model
Only 547 examples were produced, all in black, making the cars instantly recognizable.
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cars → produce → black
The GNX added a collection of visual and mechanical upgrades, including composite wheel-arch flares, heat-extracting fender vents, GNX badging, sport mirrors, dual exhaust outlets and a distinctive three-piece rear spoiler, reads the online report.
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report → add → flares
The car also rides on 16-inch cross-lace wheels and features a limited-slip differential, air conditioning and cruise control.
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car → rid → differential
A turbocharged V6 with serious muscle
If we go by the report, under the hood is a turbocharged 3.8-liter V6 modified by ASC/McLaren.
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V6 → go → McLaren
The engine received a Garrett T3 turbocharger, a larger air-to-air intercooler and a lower-restriction exhaust system.
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engine → receive → air
Factory output was rated at 276 horsepower and 360 lb-ft of torque.
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output → rat → torque
Power reaches the rear wheels through a 200R4 four-speed automatic transmission fitted with an upgraded oil cooler.
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Power → reach → cooler
A GNX-branded aluminum cover distinguishes the limited-slip differential at the rear.
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cover → brand → rear
The suspension was also reworked and the GNX retained front suspension components from the contemporary Grand National while gaining upgraded rear hardware, including a Panhard rod, torque arm and additional frame crossmember.
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GNX → rework → rod
Power-assisted front disc brakes and rear drums handle stopping duties.
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brakes → assist → duties
Preserved almost exactly as delivered
Inside, the GNX remains unmistakably rooted in its era.
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GNX → preserve → era
A three-spoke leather-wrapped steering wheel sits ahead of GNX-specific Stewart-Warner instrumentation.
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wheel → wrap → instrumentation
The instrument cluster includes a 160-mph speedometer, an 8,000-rpm tachometer and dedicated gauges monitoring turbo boost, oil pressure, coolant temperature and fuel level.
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cluster → include → boost
The five-digit odometer now reads just 30 miles, making the car less a used performance machine than a remarkably preserved snapshot of Buick's brief but significant assault on the American performance-car market.
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car → read → market
Why the GNX remains collectible
The GNX arrived at the end of an era when turbocharged American cars were beginning to challenge expectations about what a large domestic coupe could do.
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coupe → remain → what
Its limited production, McLaren-developed mechanical upgrades and distinctive appearance have since made it a cornerstone of 1980s performance-car collecting.
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it → develop → collecting
For this particular example, the jump from $200,000 to $427,000 in just two years, and with only four additional miles, adds another chapter to that collector story.
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jump → add → story
The Aporia
