buring oil on 1999 BMW 740iL

hi 99 740il . when starting car white -gray smoke have to put in oil 2-3 qt 2x a m.

Asked by for the 1999 BMW 740iL
I think these engines start using oil after 100,000 miles as my hunting buddy has one and he asked his Beemer mechanic and the tech said they all start burning oil after so many miles