I've used several Schaeffer products and have been pleased. I've done UOAs on your oil and they returned good results, but fuel additive results are subjective. In Schaeffer's Technical Data for diesel additives they claim some level of improvement in the cetane index from 2 to 4 points. However at the bottom of the TD for Diesel Treat 2000, for example, it states "at the recommended treatment ratio, Diesel Treat 2000â„¢ Ultra Low Sulfur will not cause a measurable effect on the cetane index" There is a similar statement on the TD for Carbon Treat. My question is how can both of those be true?