Quote:
Originally Posted by Diesel_Dave
For example, the particulate levels in 07 caused all the diesel truck makers to use DPFs, but DPFs weren't "mandated" per se.
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EPA did mandate some weird rules about DPFs in 07, though. I know certain horsepower engines were required to regen every 8 hrs
whether they needed it or not, which is silly in an application that requires a regen, say, every 20 hrs. I suppose it was a way to ensure everything was working properly, but all it really did was burn extra fuel and wear out catalysts faster. I'm not sure if those rules stuck for EPA10+.
After the Navistar debacle of 2010+, I believe EPA now has mandated SCR for HD truck engines.