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The pinging is just detonation. Your ecu will detect this and pull timing thus reducing horsepower. I have accidentally filled up with 95RON/91AKI on a really early morning and redlined it to get to work quickly at almost every stoplight. On the drive home, it was pinging. So i drove gently and brought 2 bottles of octane booster and filled up with 98RON/93AKI. And the pinging was gone almost instantly after.
There should be a sign on the fuel cap that say something like "PREMIUM 98RON FUEL RECOMMENDED"
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