Few things. First, get a second opinion like Trekker suggests before you do anything. Second, what symptoms brought you in for the service to begin with? Third, 40K is a lot miles on top of a car with already a lot of miles (not too many, or meant in a bad way of course), and getting there will take a few years I'm guessing. If spending a thousand or two on miscellaneous stuff during that time to keep her going is not right for you, then you might want to consider other options.

Fingers crossed for ya!
-V