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87 octane will not cause knock...but 87 octane is more prone to knock. This starts to become more serious as compression rises..and at 12.5:1 CR..its a number thats enough to worry about.
short term knock wouldnt worry me, and the ECU will pull enough timing to compensate. But its another matter that the wear and tear of the internal components of the engine are already accelerated before the car even has its first owner.
detonation is detonation regardless if its big or small, and id prefer to know that when i go into a dealer, the car is in tip-top shape.
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