This is a very common problem. I couldn't get mine off with an impact wrench and tons of PB, I'd be interested in hearing how some folks get it loose. I just left mine and let it whine away.

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TC
Current stable:
- 2004 Mazda RALLYWANKEL
- 2007 Saturn sky redline
- 2004 Explorer...under surgery.

Past: 135i, GTI, 300E, 300SD, 300SD, Stealth