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
Posts: 2,382
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.

2010 Black 335D Sport/Premium, Michelin PSS 235/265
2000 Silver Z3 3.0i (Ret)
1999 Silver R1200C (Ret)
1968 Black 1600 Coupe (Ret)
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