On my M104 engine, the idler pulley bearing and the air pump pulley bearing went bad, somewhere between 135,000 and 150,000 miles.
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Paul S.
2001 E430, Bourdeaux Red, Oyster interior.
79,200 miles.
1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".
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