I am babysitting my pastors car while he is away on vacation. I am surprising him by doing some maintenance on his car. He has a 2003 vw passat 1.8t fwd with the 5hp19. He bought it used and I dont think the atf has ever been changed. It has 153,000 on it right now. It shifts great and I would really like to change the atf and filter but I do not want to run into any transmission issues down the road by changing the fluid. I am a firm believer that it is always better to change the fluid then leave it even at high miles but that is easy to say when its your own vehicle. He doesnt have alot of money and i am just trying to make the car last. What would you do? Change the fluid or not?