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91 or 93 octane?

Old May 23, 2018 | 10:10 AM
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2019 C43 AMG
91 or 93 octane?

I apologize if this has been asked before. I have many options where I can purchase both 91 and 93 octane fuel. In a c450 does it make a difference at all or should I not bother and just use whatever I'm close to when I need fuel?

For the record, the car is not tuned atm, but I am considering the JB1 and do have the AWE touring exhaust on the way.
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Old May 23, 2018 | 10:30 AM
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93 will provide the most gains if you end up tuning down the road, otherwise, no major differences between 91/93 for everyday driving.

Last edited by RichardCranium3; May 24, 2018 at 09:20 AM.
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Old May 23, 2018 | 10:14 PM
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like Richard said, 93 would be better once you get the tune, 91 is generally the standard for premium.

Wish we had 93 in cali
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Old May 24, 2018 | 01:19 AM
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Hi there is it a waste for me to be putting in 94 octane in my stock GLC 43. I been doing it since new but now I'm wondering if its a waste. I'm in Canada fyi not sure if that makes a difference.

Thanks
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Old May 24, 2018 | 09:21 AM
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Originally Posted by Spencer1990
Hi there is it a waste for me to be putting in 94 octane in my stock GLC 43. I been doing it since new but now I'm wondering if its a waste. I'm in Canada fyi not sure if that makes a difference.

Thanks
Definitely not hurting anything, but minimum is 91. I don't even have a 93 option where I am, but I'd run it or 94 if I did.
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Old May 24, 2018 | 11:04 AM
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Thanks for the information gentlemen.
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