An unmodified GN is nearly a unicorn. The stock turbo has gone 300k? I am a huge fan of the Buick Grand National and my dream car would be an 87 GNX. Those 3.8 liter engines will easily get to 300k with proper care. It is the GM electronics, transmissions etc. that definitely will NOT. He must also be on his 3rd CPU too eh?Longevity of a vehicle usually comes down to how well the owner/driver maintains the vehicle. Just because you drive a Japanese car doesn't mean you can drive 100k miles with no maintenance work and expect it to last another 100k miles.
IMO, as long as you take care of the car, it will last a long time.
My friends Buick Grand National, unmodified, has 300k miles and still runs like a new car.
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