Light blue smoke?????
 

Hey guys i just noticed the other day when i got on it that there was a real light blue coming out of the exhaust pipe. So i layed in to it again say 10 mins later and it was just the normal black (Soot). Truck is all stock except edge evoloution tuner on stage 1(eco). NO smoke at idle or cold start and truck runs tits! It does sit all week, Shes my weekn warrior. Is this normal in winter? Any help much appreciated. The blue smoke only happens here and there and its only when your mid to full throttle.