How much is it worth

I came across an 85 300td station wagon previously owned by a man who literally owned an oil co. The car was for his wife and she was driven around in it by an employee.They paid cash for it from dealer and are the only owners of it.It has been garage kept and serviced regularly.It has just under 29,000 original miles .It basicaly has all the bells and whistles on it and every thing works.My question is what could I expect to get for it.

An 85 and only that many miles? 10-15k, I would say. If its in as good as condition as you say, keep it. It will hit 500k miles like all the others if you dont do anything dumb. :)