using proper octane for my car
I have a 2020 BMW 330I X drive with 52K miles. I have been using either 91 or 93 octane since the car was new. It has on the the fuel cap door that it is recommended to use 91 octane but can use 89 octane as the minimum. Would this adversely affect my engine. I do realize that I may not get the same performance but I would be fine with that?
If the gas door or owner's manual says you can use 89 Octane, you can use it with no ill effect. The car was designed for gasolines that are within the stated octane range. You'll lose a little horsepower and torque, but not enough to really notice, unless you drive like a maniac.
If it says 89 minimum is required, then you can use the 89. Just follow what the owner’s manual says.
Use the 91.
