All I can tell you is I'm near 65,000 miles on my '98 S3 and no issues with my top front mount. I did have my rear isolators come apart, around 25k, but they were replaced under recall, new swing arm and shock too.
I am the third owner, my brother was the second, he picked it up with 6000 on the clock in early 2000, and only put 700 miles on her, he and I haven't replaced it and the maintenance records from the original owner don't show it being replaced. I would check for some other causes, something out of alignment or not adjusted/tightened correctly.
Later