Nissan Sentra Repair Question
the hose is probably a vent. the blue smoke you're indicating is that your car is burning oil. more than likely the piston rings are worn or the valve seals. the only way to fix the problem is rebuild the motor or replace it.
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If you notice blue smote on start up, good chanch that the valve stems and or guides are worn, smoking all the time normally indicates worn or broken oil control rings, don't waste your money on fixes in a bottle, they don't work a re build or change over is your only option.
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