Hello need suggestions please. 2006 F150 5.4 liter 198k and going strong. This truck is new to me. I would like to know opinions on a possible weight change from 5w20 to a 5w30. I know these engines can have cam phaser issues which this one does not. I figure the internals are loose enough to warrant a little thicker oil. But do not want to risk phaser noise from too thick an oil. Or shall I stay with the spec'd 5w20? I will try to stay with motorcraft FL820s and the motorcraft synthetic blend oil. Thank you in advance.