Quote:
Originally Posted by Rockman59
The MB rule of thumb for replacing your timing chain and guides is 10 years and/or 100K miles. The chains seldom break on their own but the plastic guides become brittle, break, and drop into the chain system and cause major problems. And as long as you are going to all the trouble to replace the plastic parts you might as well put in a new chain too. They are not expensive.
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Chain life varies so much on MB motors there is no rule of thumb, or factory recommendation, on changing the timing chain. To change a timing chain just because it has reached 10 years or 100k miles is an outdated notion. It would be foolish for example to change a 104 motor timing chain at 10 yrs/100k miles. It's not a question of how much how much it costs. Changing a good unmolested factory timing chain is more likely to create risk than to mitigate it.