Quote:
Originally Posted by serialk11r
They probably figured going after NOx in diesels is a lost cause, so might as well try to just regulate PM.
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Going after NOx in a Diesel is absolutely harder than on spark-ignited engines, even though it may not be a totally lost cause. But as PM and NOx emissions used to be inversely proportionate to each other, other approaches more often seen on racing such as water + methanol injection could level the field, yet the average Joe who now swears the hell out against EPA because Diesels are now much more complicated might not be willing to try any other emissions-related device after having some bad experience with DEF.