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Message: <blockquote data-quote="PoManNox" data-source="post: 23554" data-attributes="member: 8300">Could it have been jostled a little loose from the sparkplug change?In terms of the oil carry-over, it's unfortunately the nature of the design.  I dunno if you've seen any of the PCV system threads on these 1.5 turbos, but per design, a large portion of the PCV vapors are routed directly into the suction of the turbo.    This oil/water mix gets forced through the turbo compressor, then cools, condenses and pools in the charge air cooler, where it eventually gets carried over into the throttle body.  You'll notice it seeping out of that clamped area.I don't know of a way to mitigate this unless you want to try to scab in your own catch can concoction into GMs wonderful one time use, tamper proof PCV system.</blockquote>