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Automotive/Using high octane gas
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Question
I have a Honds Civic Si and Mercedes Benz C230 sports coupe, both using ONLY high octane. Can a lower octane be used occasionally?
Any downside?
Use only whats recommended.What part of the country are you in,here in california the fuel is unleaded only but im sure it differs in various states.Your car would need to be set up for unleaded,if it isnt then you would damage the engine using other fuels.
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Answers by Expert:
Sean Halliday
Expertise
general auto repair,japanese,bmw,mercedes,mini cooper 1960/2009,general british cars,ford.I DO NOT work on automatic transmissions.Manual transissions i install clutches only.Many people ask me to diagnose noises from their cars,unfortunately i cannot do this unless i hear it.As you appreciate,vehicles can and will make a variety of noises.I DONT UPGRADE or fit aftermarket performace kits,parts,chips,only replacement parts.
Experience
40 years experience on all general auto repair.
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