Subaru recommends using unleaded gasoline with an octane rating of 87 or higher for most of its vehicles. However, certain models, particularly those equipped with turbocharged engines, may require premium fuel with an octane rating of 91 or higher for optimal performance. It is essential to refer to the owner’s manual specific to your Subaru model to ensure you are using the correct fuel type for your vehicle. Using the appropriate octane rating is vital for maintaining engine performance and efficiency. Additionally, using fuel with a lower octane rating than recommended can lead to engine knocking, which may have adverse effects on the engine's longevity. For specific concerns or further information, one can always look at the current Subaru website, where additional details might be available. Maintaining the right fuel type will help ensure your Subaru continues to operate smoothly and efficiently for many miles ahead.