It'll be fine, I run 0w40, 5w30, 5w40 and 10w40 in my 04 Expedition with the 5.4 2valve just fine. My mechanic wants me to run 15w40 in it, may try it next oil change as I found some clearance chevron delo 15W40 synthetic
My 5.4 powered expedition has gone a ton of miles on 5w-30. There are over 260k miles on it and no VVT noises or timing chain slap. These things love 5w-30. There's zero down side and probably reduced wear on these problematic motors with thicker oil.