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Since I didn't notice in your posts that you have changed your spark plugs, I would recommend replacing your spark plugs with the OEM type if you havn't already done so.
I agree with Blackmercedes regarding the plug wires.
I usually monitor the gas mileage on my cars, when I notice a drop in mileage then I check the condition of the plugs, wires, distributer, etc.
From other posts it appears that the chain tensioner, guides will wear before the chain does. I've havn't experienced either yet.
Keep using your eyes and ears for anything abnormal with your car and enjoy your next 100K from your Mercedes.
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Ray
1998 Mercedes E320, 200K Miles
2001 Acura 3.2TL, 178K Miles
1992 Chevy Astro, 205K Miles
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