i buy the 2.5 gal blue def jug from autozone which comes with a hose. depending on use, it will last a long time. Just don't forget that there are two fill points. Yes, i spill but i also just carry a bottle of water with me to rinse it off so no big deal.

As for my oil changes, I found that surprisingly, a dealer close to me sells the oil change kit (oil, filter, o-rings) for the same price as I could source online. Don't forget.. there IS a dip stick.

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-kp!
2009 X5 35D