Thread: DEF Usage?
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Old 11-17-2012, 06:37 PM
dunderhi's Avatar
dunderhi dunderhi is offline
Next car: '18 AMG GT Vert
Location: MD
 
Join Date: Dec 2006
Posts: 6,664
Mein Auto: 15 M6 vert, 15 328dxt
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%.
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2015 M6 Drophead Coupé
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2013 X5M Sport Utility Vehicle
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