Lil' background here. This was on a 2013' Escape, 1.6l "Eco boost" that calls for 5w30. Had it at our work since new and it gets driven hard. Driver said it "has a cold tapping kinda noise. Well, valve cover was leaking and I changed the spark plugs and valve train looked ok. Had Calvoline Full synthetic "high mileage" ( read full syn. MaxLife 5w30). I changed the oil and filter, started up and tapping was gone. Drove it most of Friday also. It got Eco Ultra 5w30 synthetic blend and a TG-3614. I'll check it again Monday. Tough son of a gun to cut too and you see a lot of cleaning and it caught a TON of stuff!
. You could say I "hacked it open" also as thick can on this one