07 pontiac grand prix with 171,000 mile how much longer will it go?
Do you change the fluids, like oil and coolant, trans fluid regularly and maintain it? If so, a long time, as long as you put money into it, unless it's a rust bucket.
If it runs good now and does not use oil I would not be surprised if you get 250 or more out of it. Like Tom says, maintain it good and it will go a long time.
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