Quote:
Originally Posted by redpoint5
To the best of my research, both catalytic converters and particulate traps require ULSD. Urea reagents are often used in place of catalytic converters however.
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Cats were used before summer 2006 when ULSD was phased in so no it is not required for cats. Urea is used to control NOx emissions which a diesel cat can not control because the diesels run lean unlike a gas engine. Diesel cats only control CO & HC, the DPFs go after soot or PM.