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Strife it may be worth while to try to run the engine with the valve cover removed and verify visually that those last two holes are spraying. Also look around the plastic fittings to make sure one of them is not leaking more than the rest. I really think this is an area where MB started to go down hill when they introduced the plastic fittings and chain guides. F$%k it, it will get through warranty.
If the cam spins by hand with lifters out and sprocket removed then everything should be OK unless the cam was put in tight and the rear bearing is now worn. That will cause excessive pressure loss at the rear bearing and starve your rear lifters, so also try to check oil leakage out of the rear cam bearing and compare to the others.
Yes it will be messy and smoke like hell.
Good Luck
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