I’m not familiar with the layout of the Ecoboost (I’m assuming that’s what you have as it doesn’t look like a Coyote) but that looks like a PCV return hose to me. If that’s what it is, I’d imagine that’s oil residue that has collected around the joint. If I’m right, I’d also say it’s normal and wouldn’t worry about it. But that’s all assumption. Someone that knows will chime in and either confirm or disprove my theory.

Unless there is a drip it isnt a leak....Its called “controlled seepage” LOL No in all seriousness just clean it off. Your fine