Motorcraft 5w20...I have to drive quite a distance for it but stock up on it when I can. It seems to work amazing and make the engine much more quite and smoother than the 5w20 Mobil 1 I was using. I made such a difference in my 3.0L Duratec Ford that even my wife noticed how quite it ran!!
Mobil 1 - I use their HM Synthetic 5w30 in 3 of my 4 cars - zero issues. My GP is at 166k miles and you'd think it had half that. My Sonic needs Dexos1 5w30 so working at a dealer has its perks lol.