VERY interesting. About 3 years ago we lost an engine in our 93 400E due to the oil pump failing. A tech came in from corporate and did an autopsy on the engine. Said he found a valve keeper in the oil pump. Lucky you caught it before you hit the big time.

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95 SL500 Smoke Silver, Parchment 64K
07 E350 4matic Station Wagon White 34K
02 E320 4Matic Silver/grey 80K
05 F150 Silver 44K