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    roisinmkennedy's Avatar
    roisinmkennedy Posts: 1, Reputation: 1
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    #1

    Mar 19, 2014, 03:18 PM
    Blue smoke from Renault Premium 450dxi year 2007
    Why is there blue smoke from Renault Premium 450dxi year 2007?
    It is not - turbo or cat.
    TxGreaseMonkey's Avatar
    TxGreaseMonkey Posts: 16,761, Reputation: 5597
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    #2

    Mar 19, 2014, 05:14 PM
    Blue smoke forms when the engine's lubricating oil is being burned, indicating worn piston rings, valve guides, or valve seals. Also, the oil can come from an air filter overfilled with oil or an overfilled crankcase. If it smokes at start-up or take-off, suspect the valve seals. If it smokes all the time, the rings are likely bad.
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