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Message: <blockquote data-quote="NXR71" data-source="post: 27423" data-attributes="member: 6892">You may have misunderstood my question. I was not asking about the octane. I was asking whether you were using the Top Tier Gas brands that are recommended in the owners manual. Those have extra detergents to help keep the engine cleaner. All of the cars our family has owned for the last ten years have recommended Top Tier gas.Here is the list of brands and Circle K is not one of them: <a href="https://www.toptiergas.com/gasoline-brands/" target="_blank">https://www.toptiergas.com/gasoline-brands/</a>I'd run a fuel system cleaner once or twice through the engine and then start using Top Tier gas regularly. It may not help short-term but should help long-term.[ATTACH=full]3092[/ATTACH]</blockquote>