From the cars.gov site
How do I know if my car or truck is an eligible trade-in vehicle?
There are several requirements (but you also have to meet certain conditions for the car or truck you wish to buy). Your dealer can help you determine whether you have an eligible trade in vehicle.
Your trade-in vehicle must
* have been manufactured less than 25 years before the date you trade it in
* have a "new" combined city/highway fuel economy of 18 miles per gallon or less
* be in drivable condition
* be continuously insured and registered to the same owner for the full year preceding the trade-in
* The trade-in vehicle must have been manufactured not earlier than 25 years before the date of trade in and, in the case of a category 3 vehicle, must also have been manufactured not later than model year 2001
Note that work trucks (i.e., very large pickup trucks and cargo vans) have different requirements.
For passenger automobiles, the new vehicle must have a combined fuel economy value of at least 22 miles per gallon
According to
www.fueleconomy.gov the combined for my 1990 Bonneville is 19. So no new wheels for moi.