Significant blowby reduction with FTC Decarbonizer

“I had my doubts going into buying this product but the alternative was physically going into the engine. Have a 2013 Freightliner chassis Class A RV with a Cummins ISC 8.3 in with emissions intact and only 54,000 miles. Assumed a lot of idling and sitting.

Was getting a crankcase pressure high code on long hills as well as when using the exhaust brake. Had significant puffing blowby at idle out the oil cap. Added the FTC Decarbonizer at a 1:800 ratio and within 100 miles blowby was reduced enough that the code only came on two times the entire day without a derate, which before the derate happened every time you used the exhaust brake. I still have blowby but it is reduced enough that the code is not coming on like it was. I have only ran about 20 gallons of fuel so far. I expect it to continue to get better. Of note the turbo VGT was sticking some. It seems to have gotten better.

To be clear if you have blowby from bad/broken rings, etc this will not help it. It is purely a carbon oxidizer. If you’re expecting an engine to run totally different, I don’t believe you’re going to see a change in intake carbon buildup. And that may be because it requires at least 200c temps to begin oxidizing. I will follow up after I’ve run the gallon through.“

Brian H, Butner, NC