Timing Chain Tensioner leaks on my E300. Never seen this or have experience. It is the highest point of the leak, not the valve cover.

Is there an o-ring, or do I have to replace the whole tensioner? Advice. Thank you.

Jake

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Only diesels in this driveway.
2005 E320 CDI 243k Black/Black
2008 Chevy 3500HD Duramax 340k
2004 Chevy 2500HD Duramax 220k