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Had the same noise and situation .It was multiple issues- all very expensive!
Standard procedure:
1. Locate precisely the location of the noise with a pro tool like Engine Ear. Eliminate the easy things like exhaust leaks.
2. Drop the pan and dissect the filter to inspect fr metal debris.
3. Do the math on the lifters. If one is bad, how bad are the rest ? You my need 24 ! The cost of those parts ,fitting them and all the 'while you are in there' stuff is eye watering.
That assumes there aren't other issues. With mine there were.
Hurry up with the VW ?
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