87 or 89 Octane in CLS 550? - Page 5 - Mercedes-Benz Forum

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post #41 of 41 (permalink) Old 11-09-2012, 11:23 PM
BenzWorld Junior Member
Date registered: Oct 2012
Vehicle: 2013 E550 Cabriolet, Lunar Blue
Location: SoCal
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Interesting comments on this. In California, our high octane is 91. East of about New Mexico, 93 is very common. East coast, it seems 93 is the norm.

I have a question though. Higher altitudes require less octane on normally aspirated cars. At what altitude does that come into play? One of my cars recommends 89 octane. It spends most of its time over 3000 feet elevation. Can I get away with using 87 in it?

My two pressurized cars ('02 Volvo C70 HPT - 14psi factory turbo, and '13 E550) should both believe they are below sea level when generating boost and always requires at least 91.
Gerry_C is offline  
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