While this is not a MB, an engine is an engine. I have been running Castrol high mileage 10w-30 in my Toyota for the past 10k miles. When I first got the car it would let out a nice cloud of blue smoke on start up because of worn valve seals. I switched to this oil thinking it a snake oil but it worked! No more blue smoke on start up and reduced oil consumption. I know they have this oil in 10W-40 and 20W-50 weights; I'd give it a try.

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2016 Corvette Stingray 2LT
1969 280SE
2023 Ram 1500
2007 Tiara 3200