Originally Posted by klucas
If your berk uses def fluid you won't know it's happening unless your dpf filter is clogged and need to do a parked regen. Def fluid is used when it burns off the soot. It's also my understanding you will not get a drop in mpg since its using the def fluid for this process. I do a lot of hwy driving with my 2012 berk never had a lower mpg and never had to do a parked regen. I go thru about 1 gal of def fluid per 2-300 miles. I have 45k on it now.
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Not doubting your word but, Woah! Waitamin...DEF usage is typically injected into the exhaust stream by a metering system at a rate of 2% of diesel consumption. So, to keep the math simple, 2% of 100 gal = 2gal DEF; worse case assume 9MPG** = 900 miles. So, 1 GAL DEF per 450 miles of travel.
** Some Berk owners are reporting MPG in the 10-11 range.
So now MY question is can something go screwy with the DEF injector? Is a high DEF usage rate indicative of something going wrong in the engine or exhaust systems?
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