SL/R230: Mid Range Gas
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Join Date: Apr 2006
Location: Bonita Springs, FL
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2021 Cirrus Silver S580 AMG, 2020 Polar White GLE350
The timing will be retarded and it will not ping; however, performance and mileage will suffer. It is not a good idea to use lower octane fuel as the engine was not designed for it. If it is an emergency, feel comfortable using mid-octane fuel...but don't make a habit of it. The warranty does not cover damage from lower octane fuels. TwinCam