Hey guys! Recently purchased a W212, equipped with the M276 motor with 110k miles. No issues whatsoever, rides super smooth. I’m interested in walnut blasting the intake valves as a preventative maintenance item, but haven’t found any shops near me that work on MB in the NJ/NY region (even called 5 local dealerships). Saw some videos of other car makes where they remove the intake plenum, place the piston at TDC, then soak the valve with sea foam or an equivalent. I’m thinking of doing this but wanted your advice as I haven’t found anyone attempt to do so on this motor. Any advice is appreciated 🙏🏻
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From my experience, if your engine running smooth, you'd better not do anything like clean or remove carbon deposits, that's no benefit for the driving feeling.