07-16-2020, 09:38 AM | #1 |
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High DEF Fluid Use with Kerma
Got the notification for low DEF fluid after about 3,500 miles with the Kerma tune. Was hitting close to 8-10k prior. Anyone else seen this? Is this a cause for concern.
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07-16-2020, 10:04 AM | #2 | ||
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Drives: 328d Wagon, M2 Comp, i4 eD35
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That said, the Kerma tune does shift more emissions management onto the SCR system in order to increase power and fuel economy while maintaining emissions compliance. I also see increased DEF usage from stock/other tunes, and my data as of last Oct is below: Quote:
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07-17-2020, 03:16 PM | #3 |
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Thanks Farkle. I thought I filled it fully when I tuned it, but possibly not. I will refill completely and make a note of mileage and see where I get on the next tank!
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10-29-2020, 08:08 AM | #5 |
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Edit: Reading is hard.
"The DEF system (passive plus active tanks) has a capacity of 18.1L. My DEF/1000mi light comes on when I'm at 3L remaining. When the first light came on after the Kerma tune I put in 12L (VW 10L jug + VW 2L bottle). My light came on again after about 5000mi. The next time I decided to completely top off the system to see how much it would take, and got 15L in there before things started spilling out. Thus my DEF consumption rate is ~400mi/L, or 6000mi before the DEF light comes on again." I put almost one whole large VW jug in there, so I believe only 8 or 9 Liters. Maybe my tanks aren't filling fully? |
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10-29-2020, 09:58 AM | #6 |
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You are most likely are not filling all the way. When my light came on with a countdown, I was able to fit the entire 10L VW AdBlue jug and just over a half of the other. A few times, I think the rate of pour exceeded venting capacity and fluid spewed out - making me think it is full. But letting it settle, then resuming the pour much more slowly, I was able to fit more fluid. You're full when you can see the AdBlue liquid inside the opening and it does not go down. I am sure next drive your pump will transfer some to active tank, making it less than 100%, but you will be close. So close to 15L is about right. You should be able to go roughly 6000 to 7000 miles between refills on your current tune.
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