***I don't think you will have to worry about this, since the miles are so low but just look at it when you drive it again:
Test drive it. Drive it on the Highway at speeds of 60-70mph and see if there is any vibration. Then go up to 90mph and see who smooth the ride is.
Go over bumps or rough roads with the windows down, and see if you hear any clucking noise when you go over the bumps.
The LCD of the temp/clock starts to blacken in the Gen. I LSs. It starts out by very little exposure then later the whole thing turns black. Here is pinned topic about it:
http://us.lexusownersclub.com/forums/index.php?showtopic=83&
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Go here: http://www.kbb.com/kb/ki.dll/kw.kc.sp?kbb....;Lexus;LS%20400
And tell us what the book value is for Private party and retail too. Since, we don't know the correct options and condition of the car.
Here is a link that will tell you more about the 1990 LS400:
http://www.edmunds.com/used/1990/lexus/ls4...title..1.Lexus*
Also, go to the below site and see what else is available in your area [so you have something to compare it with:
http://www.cars.com/search/used/cc/standar...ml?aff=national
Also, gas prices are a issue so...:
http://www.fueleconomy.gov/!Removed!/findacar.htm
Unless someone is giving a car away to a charity. You wouldn't find a cheap car with good maintance record. These are high-end imports; and the parts and labor are very very $$costly$$ which will destory your wallet, unless you are a DIYer. So, maintance record and how much stuff you have to replace & repair after the purchase, is a real BIG factor in price. ;)
You can call your local Lexus dealer and give them the cars VIN number to check to see if the car has been serviced by a Lexus dealer in any part of the country.
Also, they can check the car and tell you what needs to be replaced, repaired or any other necessory things need, but for a small $.