I would replace at least the tensioner, tensioner guide, chain, chain guides and plastic oil sleeves on the oiling tube. There are plenty of threads on this job here on PP. The life expectancy of guides is related to time so wear isn't usually a critical factor.

Use only Mercedes parts and make sure to cover the openings around the chain with rags so you don't drop anything into the timing cover or the oil pan.

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84 300SD
85 380SE
83 528e
95 318ic