That mechanic is an ass. All MB's produced now require Super or 92+ Octane fuel due to the higher compression ratio of most of there engines. The C230K is a Supercharged engine and does require the 92+ Octane fuel. If you use lower octane the engine will Ping and then the ECU will retard the timing! Thus losing power to save the engine. Pinging is never a good thing and the ECU has to detect it first to retard timing, thus meaning that there is a risk to the engine in the long term due to excessive pinging. I would follow what the MB Engineers and Designers suggest not some Mechanic who obviously would like to tell you something diferent than the guy who actually designed and built the damn engines! The M271 engine is pumping 11psi of boost from the factory, not exactly low boost for that 1.8 L engine. Follow what the Boys and Girls in Stutggart suggest!

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~Jamie
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2003 Pewter C230K SC C1, C4, C5, C7, heated seats, CD Changer, and 6 Speed. ContiExtremes on the C7's.

1986 190E 2.3 Black, Auto, Mods to come soon.....