Many thanks . From cold start apart from norm white smoke she seems to be fine nothing excessive then randomly she will blow white for a couple of minutes even when warm driving or idling in traffic quite bizzare. I have no warning lights and temp gauge norm as greydog suggested could a dirty fuel filter be a culprit and again I ask the question would a dose of redex help ?? shes done 115K which is nothing really, I am not being a tight ##### just askin if any of you guys have had a similar problem I am new to X5 allways had 3 series with no major probs,