im betting turbo seals man. I KNOW white=coolant blah blah blah. Sometimes it is extremely hard to see the blue in the smoke. trust me, my 74 pickup has had bad valve quide seals for several years. Upon startup, white smoke. My turbo seals went on my KA-T, white smoke. I do NOT stand by the white.blue smoke premesis. What does it SMELL like? Syrup? Then its coolant, petro, then its oil. Simpler than finding a hint of color in your smoke cloud. lol
BTW: take the intake pipe of your turbo and grab hold of the shaft. See if you can wiggle it. If so, rebuild time for the snail.
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