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When I rebuilt my head and re-installed, I got the occasional tick-tick. I mixed up the "valve tappet hydraulic element" (proper MB terminology) order when I took them out and replaced at rebuild time (I did not replace them, just used the old ones). Once running again, it became pretty persistent after about 2K miles on an oil change. When I changed the oil, it would go away and then come back about 2K miles later. I use Rotella T6.
The head has been on about 20K miles now. The ticking has gone away. I guess they got "settled" in.
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