so my engine just started shaking in my car and i'm not sure what the problem is. i bought it with 166k, and the po said he had changed the engine mounts not that long ago. I'm at 200k right now and not sure what would cause the engine to shake like it does now.

also the belt tensioner is rattling and making a lot of noise, where can i get a replacement for that?

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1999 Mercedes E300 188k and still going strong!