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Re: white smoke
Oil makes a blue smoke, white is usually either water(possible head gasket on its way out) which would have the sluggish effect or a weak running engine can also smoke white, again a reason to be 'sluggish'. Rich mixture gives a black smoke. you don't mention how long he was on the motorway but could have been overheating/weak rad car blowing steam out the safety valve picked up by the air intake and then feeding through teh engine. what sort of car, how old etc? check plugs/points(if old enough) and the oil. if the oil filler/dipstick has a white 'mayo' type substance suspect the head gasket.
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