- BEST is to abandon the project bc your X3 has low miles.
I also know a lot of BMW owners with MT > 200K miles on stock fluid.
Leave the stock fluid alone.
At time of clutch job, deal with this issue later.
- Most people who strip this fill plug bc:
1. The hex key or socket is not fully inserted, either from dirt inside the recess area.
2. The area is not heated beforehand. Remember that over time, salt etc. collects there causing corrosion. I always heat that are a bit, maybe 30-45 sec of propane torch.
3. Another trick is to tighten it a bit (yes tighten it), then loosen it right away.
Somehow the force of tightening "breaks" the bind, then once you loosen it it is easy.
Below is a
video on a VW Passat with stripped fill plug, it is a NASTY job.
So again, abandon the job and walk away.
Don't let your ego dictate the solution lol...
https://www.youtube.com/watch?v=gUlUY0xmuqA