I recently had my front and timing chain cover off so I had a good look at the chain.(M103) Absolutely no stretch in my chain -- was in perfect condition at 208k miles. Guide rail was brittle though, so I changed that along with the tensioner rail.
From TDC back to TDC with 2 cranks and it was virtually right on.
~Paul
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'91 300E, 208k miles
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