It messes with vehicles that have a quality sensor.I can't really even imagine what these additives would do or why they would be necessary...
I'll agree to disagree, to a point.
A properly working SCR will allow minimum exhaust and provide maximum fuel efficiency. Any one part of the system will effect both.
The systems effectiveness allows diesel engines to be tuned and optimized toward maximum fuel efficiency, while the SCR systems are highly efficient at treating the engine-out exhaust.
The SCR system uses an daptive strategy similar to long-term fuel trim (LTFT) and is used to determine the duty cycle that the DEF injector should be operated at. Since there are numerous variables that can affect the amount of DEF that is injected for a given duty cycle, the table is always being rewritten to maximize NOx conversion efficiency thus maximizing fuel economy.
I agree 100% on the platinum but if they indeed state increased fuel economy then they would be liable if it didn't deliver and I'd be surprised if any certifying agency would put their name on it.