Replaced once on my '83 300SD between 93K and 305K mile mark.

Don't recall at what mileage since I put the miles on in 8 years - it was a blur I was driving it so much. Bought new one from MB dealer, after having to use the metal rod hanging down because it broke during a road trip to East Tennessee/Georgia/Alabama. The metal ball/rod was not comfortable using as the foot feed.

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'06 E320 CDI
'17 Corvette Stingray Vert