I have never used it on a diesel. I would be very cautious about introducing any liquid into a diesel intake. Just a little ether has been known to bend a rod. There just isn't room for anything on top of a diesel piston.

We have used Redline diesel catalyst for years with good results. It goes into the tank and is not a typical combustion enhancer. Its job is to catalytically burn off the carbon deposits.

Techron is also used to burn carbon in diesels.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician