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Check the intake, especially at the throttle body. It might be sucking oil from the Air oil separator, very likely due to bad o-rings that seal the AOS to the engine crankcase. If it is, there will be a good oily mess in the throttle body and the intake manifold. Mine does this and will leave blue smoke now and then, especially at high rpms/throttle, and especially if it hasn't revved hard for awhile.
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1987 silver 924S made it to 225k mi! Sent to the big garage in the sky
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