I'll have to look but the 2.5 gallon carboy of BMW fluid is really, really cheap. $20 I think at my dealer so that's where I get mine. My dealer has given me a five gallon carboy on the house in the past.

I saw a substantial decrease in miles between 'No Start' warnings from 11-13000 miles to just over 8000 miles when I tried Peak and AdBlue DEF. The actual consumption rate depends on a lot of factors but I didn't feel like I was saving anything so now I use BMW DEF only.

I know the 'No Start' warning occurs every 11-13000 miles if I let it go so now I top it off every oil change which is every 8-9000 miles and know I can go further if I need to.

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8/2011 X5 xDrive35d Sport, Black Sapphire Metallic, Black Nevada Leather, Fine Burr Walnut Trim
2/2001 M5, Jet Black, Exclusive Complete Black Walk Nappa Point Heritage Leather, Black Cubic Trim