OnyxCLK

I live in Cyprus... just out of curiosity, I was wondering if they make different engines for U.S.? because here and generally around europe, octane range goes from 95 to 100 octane and during the time I was in US, the highest I saw was 93 or 95 (I'm not sure)... how does this work if all engines requires a specific octane range for optimum performance??

hatem

Im not sure, but in the US they have strict laws concerning emissions, wich could mean there are diffrences in the catalytic converters. Another difference with US cars that i realized, was that they are cheaper than the rest of the world. Another difference in the cars is the power output, all US spec cars have lower HP, and that could be a result of the octane levels.

OnyxCLK

thanks for the info

well yeah I already know about the price difference, I literally cried after seeing the prices there I could have bought a clk63 amg there for the price I paid for my clk 200 here

jmf003

US octane numbers are Anti Knock Index, or AKI. They are computed by adding the Research Octane Number (RON) and Motor Octane Number (MON), then dividing by two.

Most European countries use the RON, which is 4 to 5 points higher than the AKI, if I recall correctly. That would mean 93 octane in the US would be equivalent to 97 to 98 octane in Europe.