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  1. J

    Have GM V8 Engine Technologies like Cylinder Deactivation, Light-Weight Oils Actually Hurt Truck Sales?

    Cylinder deactivation was avaliable earlier than you state. I have it on my 2007 Avalanche which I bought in 2006. Never had any issues with it.
  2. J

    Have GM V8 Engine Technologies like Cylinder Deactivation, Light-Weight Oils Actually Hurt Truck Sales?

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