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smoke from exhaust

  1. Bad piston ring?

    2007-2012 Nissan Altima Discussion (2.5 & 3.5)
    I bought my Altima 2.5 SL in March of this year from the dealership with 55K miles on it. After a few weeks I noticed white/light grey smoke from the exhaust once a while. Took it to the dealership and they said the cat is flooded with fuel and driving with fix the issue. Issue never resolved...