Hey, guys!
Just found out this while making regular maintenance:
The car was running smoothly with steady idling and with no problems whatsoever.
My Boxster had a cam guide worn 12K miles ago, and I've had substituted pads and cams from 1-3 bank, AOS and RMS at a local Porsche specialist. I've asked also to change pads from banks 4-6 but I'm not sure if the workshop did that.
The car has 38500 miles.
Camshafts from bank 4-6 are looking good, Thursday I'll get to open the valve cover of 1-3 to check if those camsahfts are ok too.
Going to check it with a durametric cable asap (I've just ordered one).