I have read many posts from Benzmac that the timing chains on the straight sixes rarely ever need to be changed.

The chains are short, and there apparently is a tensioner that keeps the chain tight.

Do a search and I'm sure you'll find these posts.

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Paul S.

2001 E430, Bourdeaux Red, Oyster interior.
79,200 miles.

1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".