I have used the ford cetane boost, couldn't really tell the difference. My dealer has a separate truck shop, and the service manager would always suggest me to use it, not sure if he was just trying to sell it, or if it really is needed.


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I put in Diesel Kleen every other tank. I keep a jug of it in my toolbox. I am told it helps with the IPR and injectors. I personally am a preventative maintenance ***** from my time in the Army, so I get a warm and fuzzy when its used.

 

Diesel Kleen is an emulsifier. I would never use it in the 6.7. If you want to use an additive, use a demulsifier so the water doesn't get past the separator and rust the IPR. Diesel Kleen does more harm than good imho.

 

I actually asked Diesel Kleen (Power Service) this exact question when I started using it years ago. They emailed me back and told me it was a demulsifier.

 

Here is the only study we know about. Lubricity Additive Study Results - Diesel Place : Chevrolet and GMC Diesel Truck Forums