dont jump to anything yet. make sure it is defo blue and defo your smoke. if u were infront of a using zenons then it will felect the smoke blue. secondly make sure that it is only ever on idle or huge overuns down hills and if it is its more likely turbo seals. even though its blue i know. people will bang on that it can only be white but its the temp at which oil burns that determines it colour not the location in the engine. then change your turbo with a mate good one if u can for testing purposes. after that u need to start ruling out things like the pcv valve ( just pull it off the inlet and bloack the inlet). also one off puffs have accurred and never to be seen again, an odd mystery.
