Hmm - 95 or above was written on my SL fuel filler cap. The engine changed in 95 to the 24-valve head. Perhaps that dropped the octane rating. However, my new CLK500 is also marked 95 or above. Is there a difference betwen US and European octane ratings? Don't think so.

Momo

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1990 500SL 65k km - until May 11 2004
2004 E320 4-Matic wagon
2004 CLK500 Cabrio from May 11 2004