SL-Class (R230) 2003 -- 2012: Discussion on the SL500, SL550, SL600

SL/R230: Mid Range Gas

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Old 02-27-2011, 09:39 AM
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2004 SL500
Mid Range Gas

Will the ECU retard the timing if you put mid range gas in a 2004 SL500? I have not tried it yet was wondering if it would ping.
Old 02-27-2011, 07:56 PM
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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

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