Been there. The cylinder seal gave out. The cylinder is difficult, but not impossible to remove. The part costs approx. $170 from the dealer. It can be rebuilt by Dennid Ficken in Kansas for approx. $40 + shipping. Search for threads using his name.

If you're handy and ambitious, it would be best to have all eight cylinders rebuilt. The other ones will go soon also (again - been there). The one you show is the most difficult to get at.

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95 E320 Cabriolet, 169K