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TURBOCHARGER CAUSES BLUE SMOKE

[XC90, XC70, V90, V70, V40, S90, S80, S70, S60, S40, C70, 960, 940, 850, 780, 760, 740, 260, 240]

What Causes my Volvo Tubocharger to Produce Blue Smoke?

If your Volvo Turbocharger produces unwanted blue smoke from the exhast there are two possible reasons.
Possibility #1 -The check valve for the crankcase ventilation sticks which forces engine oil out into the exhaust pipe, resulting in blue smoke.
Possibility #2 - The coolant flow through the turbo unit may be reduced, which results in the temperature becoming so high that the engine oil builds carbon deposits around the turbine-side bearing. Over time these deposits reduce the oil flow through the bearing, which means that engine oil is forced past the turbine shaft seal and out into the exhaust pipe, resulting in blue smoke.