I changed the glow plugs on my 2001 A6 and I'm fairly sure they have never been done.
I was in a position where I didn't need to use it for weeks so I just took my time with it - soak them up with WD40 for days at a time and slowly loosen them up. Didn't break any but I had to have patience to leave them overnight to soak when they were feeling tight.
Pros: took time, didn't break
Cons: feeling tight
Vehicle:
Audi A6
