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It's possible oil is not getting to some or all of the cam lobes/cam followers (lifters), and at least one pair is worn. Changing a lifter MAY help for a while but once you go through the hardened surface of a cam it goes downhill quickly. A popped-out cam oil tube fitting cause a few cam lobes to be eaten and I wound up replacing the cam and all the lifters on that side. It's a lot of money in parts even if you DIY, but the price on the parts varies widely. I'm not a mechanic but the MB shop manual is pretty thorough in this area on doing the job.
I spoke with an MB dealership mechanic with 25+ years experience , and he said that hydraulic compensator collapses are really, really rare compared to the above problem and only found on abused engines with...uhhh..."extended" oil change histories.
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