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Get a small brush/rag wet with BrakeKleen. clean those areas well, and monitor it. If it comes back within a week/month schedule the repair (if you are not a DIY)
Unless you are changing the chain tensioners, or VVT gears, leave that alone. They can create more problems than fixing a non-issue.
My 2014 W212 @99K miles had a similar look around 80K, I cleaned that area, and nothing so far. The engine environment is not a surgery room, and dust starts to stick over time.
If it is oil, you will see it coming back with fury.
NOTE: while there, take a chance and give the engine a bit of TLC. A microfiber towel to at least remove the high level dust.
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Slideshow: A one-of-one U.S.-spec Mercedes-Benz SLR McLaren Roadster became even rarer after a factory-backed transformation at McLaren's headquarters.
