While you're at it, check the battery tray. I haven't had a car yet where the battery tray didn't corrode (except for plastic trays). Some even disintegrated to nothing from the battery acid.

I always sandblast the trays to remove corrosion and coat with a rubberized coating (same as the dip coat they sell for tool handles) to prevent further rot.

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95 E320 Cabriolet, 169K