[ck4x4]

I've been detailing cars for three years and never once have had a problem spraying down a motor. Once in a while on older cars water may get in the distributor, but that is pretty rare and I've only had it happen once(no worries for me with the Max here!). Most of the cars I detailed were Acuras(I worked at an Acura dealer) but also did countless used cars of nearly every make and model. Just don't concentrate a large amount/pressure of water on the alt, electrical connectors, air intake, MAF, etc. Use common sense about how an engine works and where water is bad and you'll be good to go! A nice silicon spray that will displace water will also help stop a squeeking belt, which can be a nice thing to have handy when pressure washing an engine bay.