im losing coolant,have to fill atleast twice a week. on 2000 BMW 740iL

white smoke at start up then clears up when engine gets warm.oil and water are not mixing

Asked by for the 2000 BMW 740iL
Does vehicle consume engine oil? Smoke could be Engine oil consumption or coolant is finding its way into the combustion camber internal leak. Step one psi test cooling system when cooling system is cold only. Best practice with Spark Plugs removed. Repair any external leak first. If no leak is present possible cylinder Head/Head gasket could be the case. Good luck
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