Quote:
Originally Posted by cRiPpLe_rOoStEr
DEF is not really so good, and the SCR is not so reliable. Basically one more thing to go wrong. Might eventually work better than EGR, however.
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There is nothing wrong with DEF. SCR is a very effective way of scrubbing NOx - over 90% efficient. It's also quite reliable because it is very simple: catalyst, decomposition tube, injector, pump and DEF tank. Far more reliable than efforts to achieve the same NOx levels (in diesels) with EGR alone. As a matter of fact, other than a few teething problems the SCR systems are proving to be nearly trouble free.