Thread: DEF Usage?
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Old 11-19-2012, 03:21 AM
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Flyingman Flyingman is offline
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Location: Miami
Join Date: Sep 2009
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Mein Auto: 335d
Originally Posted by dunderhi View Post
Let's see if I got this right:

Annual miles between oil changes = 13,000 miles
MPG for my 335d = 37.5 mpg
13,000 miles / 37.5 mpg = 347 gallons diesel fuel per year
DEF usage @ 2% of fuel consumption = 6.9 gallons of DEF / year
6.9 gallons / 6.1 gallon tank (average size) = >1 DEF fill-ups / year

My first refills were early due to a repeated issue with the transfer pump, but I've made it to the past two 13k oil changes without any DEF adds. I guess BMW's add rate is less. than 2%.
It is 1% to 3%, so can vary. I've made all my intervals except this last one due to mechanic not topping off my DEF. They filled it for no charge, as they should.

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