Well with whatever everyone says about changing timing chains on those engines, I stand by keeping my original chain along with proper oil changes until 240 - 250K miles when I'll be needing valve jobs and other stuff on the top end of the engine. Of course I'm referring to my 500SEL.

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1999 Mercedes-Benz S600, 103K miles - garage queen
1988 Mercedes-Benz 560SEL, 89K miles - daily driver
2007 Hyundai Sonata Limited, 31K - daily driver