check this thread out on fogging.
https://forum.moomba.com/showthread....g-raptor-motor
lots of information out there on both sides that say fog and don't fog. did it for many years on both boats with cats and never an issue but I also know I have never fogged a cycle or lawnmower engine and they have been fine as well.
if I still lived in a climate that required a winterization I would fog.