2009 F150 FX4 with 116,000 miles. I am the 3rd owner and owner #2 changed the oil with Mobil 1 5w20 with Motorcraft filters based on the OLM for 90,000+ miles.
These pictures are all from the drivers side. The driver's side head had some yellowing and the valve cover had some cooked on varnish. The passenger side valve cover had no measure varnish and the passenger side head was spotless. The driver's side solenoid is shown below with an obvious failure in one of the screens but overall looked good compared to others I have seen. The passenger side solenoid was visually perfect.
These pictures are all from the drivers side. The driver's side head had some yellowing and the valve cover had some cooked on varnish. The passenger side valve cover had no measure varnish and the passenger side head was spotless. The driver's side solenoid is shown below with an obvious failure in one of the screens but overall looked good compared to others I have seen. The passenger side solenoid was visually perfect.