Well, it ain't really "pressure" washing it. The one I use is an electric one that is one of the weakest out there. It runs rough after I get done, but after a while it's fine. It's either that or have the engine overheat because all of the mud will get super caked on... And not to be argumentative, as you know more than me... I've used it on both trucks for years, and never had a problem other than a rough idle from cracked wires.