Originally Posted By: ddtmoto
I am impressed with Kreen. I have not yet tried a piston soak. I recently added Kreen to the crankcase and fuel in my truck and my Nissan. I can feel that the motors run smoother and just plain better. The Nissan is getting better mpg's by at least 10%. I could feel almost immediate improvements in the way they run.. I have always seen carbon build up on pistons and down into the ring pack, even in 'clean' motors. There is always some carbon on the pistons. With the [censored] they sell us for gas it is no surprise. Cleaning of the rings would help most any motor, I am thinking. I dont think it would hurt to try the soak on an oil burner...
No offense intended, but what is "Kreen", how much does it cost, what is it made out of, how much do you add to what/when, and what is it supposed to do? I've never seen it in ANY store, and I can't think of an autoparts store I haven't been to.