Hey guys, my engine builder and I are always talking and I bounce ideas off him. There is a certain trust level he has with me and let me tell you about water and meth injection. I have seen this first hand, but not on a diesel although I am sure the principal stay the same. It will wash down your cylinder walls creating hot spots. Eventually you could burn up a motor pretty easy, especially under a big load when you need the oil on the cylinder walls. Just take it easy.