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1qt of oil every 3-4k seems to be the average for the M3. Some have reported more, some less. One issue I've has is the horrible electronic dipstick. Usually I'll see the oil consumption be really high right after I change the oil. I'll see the dipstick read a quarter low, half low....1 qt low within 1k miles. After I add 1qt of oil I won't see the dipstick move for a good 5k miles or so.
I can only assume the incorrect amount of oil was put in (unlikely since I measure out 8.8qts when I change the oil)... Or the dipstick is reading correctly.
Either way you should plan to change the oil around every 7500 miles, not the crazy 15k miles interval suggested by BMW. Within the 7500 miles you should only need to add 1-1.5qts. YMMV of course.
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