Can 89 octane gasoline be used in the MDX without harming it?

Hi, my name is Devin. I am an auto repair expert with the Car Genius team here at RepairPal. So sorry to hear you're having trouble with your vehicle. While using 89-octane gasoline in your MDX may not necessarily damage your car, it's worth noting that Acura typically recommends using 91-octane or higher for optimal performance. Using fuel with a lower octane rating than the manufacturer recommends can cause symptoms such as poor fuel economy, reduced acceleration, and spark knock, especially when the engine is placed under heavy load while driving fast or accelerating quickly. If you need more advice, have any other questions about your vehicle, or would like to get connected to a RepairPal Certified shop near you, we have you covered. Give us a call at 877-913-1554, and we will happily help you out!