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If it only happens for a second or so on a cold start I wouldn't fret. If it continues for longer periods of time, or even when hot it could be the hydraulic compensators or it could be a cam lobe (or two) wearing. On my 560SEL I wore through the cam lobes around 190K and had to replace both cams. That started to show with a slight ticking when warm and was really loud on cold start.
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Mike Tangas
'73 280SEL 4.5 (9/72)- RIP 
Only 8,173 units built from 5/71 thru 11/72
'02 CLK320 Cabriolet - wifey's mid-life crisis
2012 VW Jetta Sportwagon TDI...at least its a diesel
Non illegitemae carborundum.
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