All Benz had hardened valve seats and bronze valve guides as OEM so no issues with using "unleaded" gasoline. Adding lead to gasoline was mostly an American thing.

Performance may suffer a tad using the ethanol blends but the main problem you will encounter will be the deterioration of the older rubber fuel lines and associated parts. Not a big deal to replace them.

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“Whatever story you're telling, it will be more interesting if, at the end you add, "and then everything burst into flames.”
― Brian P. Cleary, You Oughta Know By Now