AboutSean Halliday Expertise general auto repair,japanese,bmw,mercedes.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.
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?
Answer 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.
