Quote Originally Posted by Tone
I run a qt of diesel through before every other oil change as it is cheaper and accomplishes the same thing. You might want to do it every time you change your oil to clean away the excess. sludge.
Do not do this without removing your coilpacks and plugs completely as you could seriously damage your engine, but better yet don't do this at all. This is an "old school" technique and is correctly done using kerosene which is an "engine wash". Believe it or not, it's actually detailed in my Caterpillar manuals from the 30's and 40's and is how I clean the transmission and clutches on my crawlers. However, diesel and kerosene can do some very nasty things to the inside of a modern engine, so if you want to go to the extreme of an engine flush then use modern off-the-shelf products.