S40: Replacing VVT Pulley (Variable Valve Timing)

When we took off the cam cover to install the alignment tool, this is what we found. This profound carbon build up from a protracted bad PCV system can reek havoc with the VVT system by oil starvation. This may bring your check engine light on intermittently and inexplicably-even after the valve is changed. So change your oil at 3,000 miles