My friends E300D got 7 years and 148k out of the original belt. It probably still had a few thousand miles of life in it, but it was starting to crack.
I would say every 100k or 5 years is a safe replacement schedual. They are only about $30-$40.
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1999 SL500
1969 280SE
2023 Ram 1500
2007 Tiara 3200
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