Out of the frying pan, into the fire.
The Passat, especially in station wagon form, is a very attractive car. Don’t let its beauty fool you.
This is not a good move.
What should you be looking to go wrong with an '03 Passat? Everything, especially at 100k miles.
First of all, it needs a timing belt NOW. Not tomorrow, today. $600-$750, or more. You didn’t tell us which engine this “good deal” has, but it doesn’t matter. It needs a new timing belt before you buy it, or right after you buy it, but before you drive it.
If the timing belt breaks the engine will suffer very expensive internal damage. I’ll bet that’s why the original owner traded this gem when he or she did. They didn’t want to pay for the timing belt service.
Neither do you.
The potential problems with an '03 Passat are to many to list. Don’t walk, RUN away from this car.
Find something else. There are other, better, options.