I think there would be a lot of factors attributed to how much oil you would see in a catch can. How many miles are on the vehicle, driving conditions, how the vehicle is driven and maybe even type of oil would be factors?? I have a 2024 Edge St and I plan to do more research before I decide if I will install one.
One thing I thought about, wouldn't this oil have some benefit to provide lubrication to the intake valve? I know the carbon buildup is an issue, but the amount of buildup seems to vary greatly from brand of vehicle and model of vehicle. In other words, it seems to not be an issue with certain brands/types of direct injection vehicles. Maybe some would benefit from a catch can, and some would benefit from the lubrication??? I don't know much about it to give an honest opinion.