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Technically the car can still run on 87, but you just won't get the same power. The car isn't going to explode with 87. The car has knock sensors and if it detects knock, it will retard the timing.
If they say it's the gas and you didn't use 91 and caused the car to blow up, we'll that means the car has a problem and won't detect engine knock so it's they need to fix the car.
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N1rve
2019 BMW ///M4 - Alpine White | Sakhir Orange/Black Leather | M-DCT | Executive Package | 19" Black 437M Wheels | Carbon Fiber Trim | Sunroof | Active Blind Spot | Heated Steering Wheel | Adaptive M Suspension
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