what is a 1986 wagon with 20000mls worth
$1000 tops if it's in excellent condition, half that if the interior and paint are near 8 out of 10.
If it's in excellent condition, with only 20k miles on it, it's worth more than $1000. NADA.com lists it at $2225 average retail (dealer price). But that is assuming average miles, and not 20k miles (Well below average). It's not exactly a classic car. So it depends on what an individual would pay for it.
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