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It shows up on my ScanGauge as timing pulled because of knock. I remember one 15*F night last winter blasting down the freeway and seeing a constant 2-2.5* of timing pulled because the computer was detecting knock.
I have the naturally aspirated 3800. The supercharged ones do knock as well. Battling knock is a constant struggle in the 3800 community.
My engine should be pretty clean. I've been running a dose of Marvel Mystery Oil in the gas for the past few thousand miles. I forgot it this tank, and the car's letting me know.
When I hooked my SG up to my brother's 3400 powered minivan, that thing knocked up a storm on 87 octane.
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2012 Chevrolet Cruze Eco 6MT
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