I had my car go in for general serivce (oil change and what not) and the last couple of days my car has been telling me to check my oil, so I go and check it today, and there like no oil at all in there and its all dirty brown looking like dirt. My question is how did 8 quarts disappear so fast from august 13 to now? My car show's only one green bar gone. What do I do?

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E53 '04 x5 3.0 6-speed manual