S4 Timing belt

[castillo@caries.dental.mu.edu (Dr. Manuel Castillo)]

I have a 93 S4 with 70K miles. The car is is running great, I am planning a
trip to Colorado in two weeks (@3000 mi) I was going to have a tune up done
before I left. When I called my mechanic he recommended changing the timimg
belt and tensioner. He made it sound URGENT. I checked in my manual and it
is recommendedto inspect the belt at 60K, but no reference to changing the
belt.
I do want to change the belt, but I wanted to postpone the change until
after my vacation.$$$. Should I go with only the tune up or do the change
now?
Manuel.