Premium is not better for your car. However if your engine is designed for higher octane, not using it will cause damage (knocking/preingition). Some engines like my wife’s mazda adjust for either (boost pressure), so you actually do get more power from premium, but you can also use regular if you want. I.e. read the manual
According to the owner’s manual of a BMW X5, mid-grade gas (89 octane) is the minimum fuel type, but premium gas (91 octane or higher) is recommended: Source. So, if you fill up your BMW X5 with mid-grade gas (89 octane), it will run safely. However, you risk damaging the fuel system or engine by using regular gas (87 octane).
What type of gas does a 2013 BMW 528i take? No matter your model, BMW recommends using only premium-unleaded fuel. Does BMW 528i need premium gas? As we said, the best gas for a BMW is premium. Premium gasoline is the best gas for BMW models because of its higher octane rating which also is a more seamless fit with a high compression engine.
"Super Premium Gasoline/AKI91 This gasoline is highly recommended. However, you may also use gasoline with less AKI. The minimum AKI Rating is: 323i,328i/xDrive: 87 335i/xDrive: 89. If you use gasoline with this minimum AKI Rating, the engine may produce knocking sounds when starting at high outside temperatures. This has not effect on the
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do bmws require premium gas
