octane 91

  1. R

    W140 S500 Octane Grade

    Hello! Recently purchased a W140, S500, 1996. The previous owner strictly advised me to stick to 95 rather than 91 octane grade fuel whereas the operator's manual recommends Premium Unleaded Gasoline: Posted Octane 91. Could shifting to 91 make any difference on performance, engine or the...

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