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What octane fuel do you put in your W205 C300?

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Old 07-24-2016, 05:18 AM
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What octane fuel do you put in your W205 C300?
What octane fuel do you put in your W205 C300? 89 or 91 octane? Or do you go all out and put 93/94 in it?

What does the manual recommend?
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Old 07-24-2016, 06:13 AM
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95RON is the standard in the UK. 98+Ron goes into my BMW 6 cyl.
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Old 07-24-2016, 07:01 AM
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Minimum 91 octane.

I personally use 93 octane since it's readily available in my State of Massachusetts. I can even get 94 at a Sunoco if I wanted it last time I checked.
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Old 07-24-2016, 07:27 AM
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2015 C250 AMG Line, Vision, COMMAND, Seat Comfort, Driver Assistance, Parking Assistance W205
98.
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Old 07-24-2016, 07:31 AM
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No point putting in anything over 95 as the engine ecu doesn't take into account any adaptations past that RON value.
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Old 07-24-2016, 09:55 AM
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Originally Posted by ManiacGT

No point putting in anything over 95 as the engine ecu doesn't take into account any adaptations past that RON value.
...unless you're running an aftermarket performance tune...

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Old 07-24-2016, 11:30 AM
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which seems rare...
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Old 07-24-2016, 11:53 AM
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2015 C300 Sport: Palladium, Premium, Multimedia, Leather, BLIS
91 routinely. 93 is rarely available.
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Old 07-24-2016, 12:35 PM
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93. Im in NY state and price difference between 91 and 93 seems to be negligible.
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