I've read several times here from Stevebfl, Benzmac and others that the inline-6 timing chains really don't need to be replaced. They are very short and don't stretch very much.

Just my .02 cents.

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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".