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Pre-facelift B8 models (2009–2012) are notorious for defective piston rings that allow oil to bypass into the combustion chamber. If your car consumes more than 1 quart per 1,000 miles, perform a crankcase pressure test using your manual's specifications to rule out the PCV (Positive Crankcase Ventilation) valve before condemning the engine block. Timing Chain Tensioner Failure