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Cummins dealerships have a product called 4C cleaner( combustion chamber cleaner) that they use mostly on generator engines. Stuff works quite good on removing carbon buildup inside engines and throttle bodies( I used to work for Cummins Northeast). Two cans for a 4cyl engine in the same intake port. Directions on can are very easy to follow, and you WILL want to do it in an open area. Won't smoke in a clean engine( tested it myself in a freshly rebuilt generator engine). Could be safe for diesel engines, not 100% sure.
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