Doc,, good luck with the new wheels. But as someone stated, there is a seven year age difference. There is a lot of plastic and vinyl used in the trimmings on both model lines and these bits tend to exponentially deterioate with age. This is true no matter who makes the car. As far as mechanical stuff. If you take care of fluids and maintainance and the like, you will probably get reasonable service from the Lexus. An 87 300E is just about 15 years old (considering production dates). How many other things do you own that are as old and still function well.
Anyway, enjoy your new car. I wish you many years of happy motoring (well at least 15 anyway
)..