Quote:
Originally Posted by wch X5
My X5d also called for DEF at 900 miles. Dealer had me stop in and they found exactly what MINIz Guy's dealer found (100% in main tank, 66% in passive tank). The temperature was 35F outside....
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I believe you. But this info simply does not make sense for a properly filled 35d DEF system....
We now have reports of two 35Ds to have their DEF warning trigger a 900 miles. In both cases the dealer reported the active tank @ 100% and the
passive tank @ 66%.
AFAIK the DEF system holds a total of 6.5 gal: 2 gal in the main (active) tank and 4.5 gal in the passive tank.
So that would imply that these two 35Ds consumed 1/3 of the DEF in their
passive tank in only 900 miles. 1/3 of 4.5gal = 1.5 gal IOW a DEF usage rate of 600 miles / gal of DEF => a full DEF system would only last 3,900 miles.
And yet we also have several reports of 35Ds that went 12,000ish miles without DEF issues.
Funf Dreisig