You can check the chain for stretch by taking off the valve covers. Not a very accurate means of checking if it needs replacement, but it is better than nothing I guess. I believe I fully expressed my stand on this timing chain issue to you in another thread several weeks ago.

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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