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Originally Posted by Momo
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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The euro cars have higher compression and more power. Well at least they used to now they probably just change the computer program. 91/93 is about as good as you can get in the states.