i have a 99 passat with 246k on it and it runs like new,no problems at all,But i do change the iol every 2500 miles!
I have a 99 Passat, V6 - 5 Speed and have 267,000 miles on it. (A lot of highway...
Take the big black motor cover off usually 3 plastic screw, turn them 1/4 turn. The ignition coils are located beneath the cover they are kind of squarish.