If you follow whunter's advice, I encourage you to also read about changing out tensioners (or springs), chain guides, and chain tensioner guides. To do it right, there is a lot more to it than just swapping out a chain.

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1968 220D, w115, /8, OM615, Automatic transmission.
My 1987 300TD wagon was sold and my 2003 W210 E320 wagon was totaled (sheds tear).