The "Ultimate" 40'+ DP Motorhome Reviews!
Hidy-Ho Good Neighbor, “Ultimate” may be pushing things a little but we’re talking Pushers here right! I’ve been assembling information on DP’s that fit my interest from all the major DP manufac...
Forum Discussion
Foodsman wrote:
Do all Class A Diesels from 2010 on require DEF?
Well, mostly, sort of ... all diesel engines built starting 1/1/2010 had to meet new stricter emissions requirements, which most engine manufacturers met by using SCR, which uses DEF. But early 2010 models would have been built in 2009, presumably with non-DEF engines/exhaust systems. And reportedly, chassis manufacturers stockpiled pre-2010 engines, and RV builders stockpiled those chassis, so you could certainly have a 2010 coach, probably even some 2011s, that would have a pre-2010 engine, and thus not need DEF.
Don't fear DEF, though -- my new (2014) coach uses it, and gets better mileage than my 2008 that didn't. Cummins says using DEF to clean up the exhaust stream allows them to optimize engine performance better than in the EPA2007 engines that preceded these, so that mileage is better, likely enough so as to make up for the cost of the DEF, which is really minimal. (The initial equipment cost is higher though, so that's another matter.)
