I only know of one case where the customer forgot to tell the shop that his last oil change had been over 20,000 miles before.
The DOF was installed and upon startup there was valvetrain and ticking noise as the OP describes.
The shop decided to open the oil pan and here's what they found:
http://i83.photobucket.com/albums/j307/ppbon/oil2_zps0b4fb0fa.jpg
Then they removed the oil filter and this was in there:
http://i83.photobucket.com/albums/j307/ppbon/oil1_zps8234bbcb.jpg
This car's engine was throughly flushed and cleaned with Wurth Engine Flush and Claeaner.
New oil filter and fresh oil at the correct level went in and all noises went away.
It's very easy to blame the DOF (or any other new part) when in fact, the culprit was the negligence of the owner (in the above case).
Happy Porscheing,
Pedro
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