Thread: Urea refill
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      09-23-2012, 06:08 PM   #34
kbsilver
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Drives: 340GT & '22 eDrive40
Join Date: Jan 2012
Location: North Jersey

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Unless the passive tank has gone empty, the active tank will be kept almost full. Would not expect the active tank to take much unless the xxx miles to no start has been lit. If lit, the active will definately take the entire 1/2 gallon bottle. Car should use 1/2 gallon of DEF about every 1400-1500 miles. Also as mentioned before, to avoid having old DEF, best to let it run low as reasonably possible before refilling.
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