I have a '96 140k mi, jetta 2.0. It has been doing funny things for a while and I have tried to figure out how to change the fluid. At first it was jerking but now it's having a very hard time taking off in first gear , it just slips, but reverse is fine. I just descovered yesterday that the first owner broke the fill cap and it has been leaking! I found directions online to cange the fluid and called the local dealer so see if they could do it and they told me that it was a very bad thing to do cause it had "lifetime oil", I knew this was a lie. I need to do something Can anyone give me some help?