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Old 03-08-2016, 02:44 PM   #11
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I figured I'd check the manual on my 2009 390BH. Here's the page with the dash lights...
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Sorry it's sideways


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Old 03-08-2016, 04:13 PM   #12
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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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Old 03-08-2016, 04:49 PM   #13
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All great information to know. Thanks
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Old 03-08-2016, 04:51 PM   #14
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Originally Posted by klucas View Post
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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| 2017 Berkshire XLT 43A with Ultrasteer Tag | Blue Ox Avail + KarGard II |
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Nights Camped: 2013 - 24 • 2014 - 42 • 2015 - 56 • Jul 2016 - Fulltime •
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Old 03-08-2016, 05:49 PM   #15
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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?

It may be more on occasion- (def usage). But I have the 360 engine and a lead foot. We mostly travel in the mountains so I don't get 10mpg.


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Old 03-08-2016, 06:52 PM   #16
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I need to fill my DEF tank every three fill-ups


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Old 03-09-2016, 08:53 AM   #17
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Has anyone had an issue with ever having to do a regen? If so what steps did u complete to do a regen? Just curious if it is something I should lookout for in the future.
John - Regen most of the time happens automatically. However with certain driving habits, like always short trips, you will be alerted on the dash to do a manual Regen. There is several alert severity levels. A high severity level will incapacitate the RV from moving.

An excellent past thread on this explains regen.

Regen switch
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