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Fuel grade

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Old Dec 2, 2014 | 02:15 PM
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mikeyw's Avatar
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S205
Fuel grade

Just wondering what grade of fuel you guys are using in the petrol models. The British manual says:
Only refuel using unleaded, sulphur-free unleaded petrol with at least 95 RON
95 RON is what we'd call a regular fuel, probably equivalent to US 87 octane. Is it worth using a premium grade?
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Old Dec 2, 2014 | 04:07 PM
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From: Llandudno, Cape Town, South Africa
late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires
The UK enjoys higher octane fuel. For the US one should use 91 AKI (anti knock index) which equals approx 95RON. (their premium at coast)

If you can get higher octane fuel the vehicle will spend less of it's time running retarded timing as the knock sensor detects the onset of knock. Benz has had a reasonable amount of knocking trouble with the DI engines in variable fuel markets like Egypt & China.
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Old Dec 2, 2014 | 04:30 PM
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W205 C200 Sport Premium Plus. October 2018. 1497cc with 48 volt battery eq
Originally Posted by mikeyw
Just wondering what grade of fuel you guys are using in the petrol models. The British manual says:

95 RON is what we'd call a regular fuel, probably equivalent to US 87 octane. Is it worth using a premium grade?
I used BP Ultimate Unleaded 97 RON for the first 2000 miles but now use regular petrol.
Just thought that the fuel with additives to protect engine was a good idea during running in period.

Last edited by Merlin1; Dec 2, 2014 at 04:33 PM.
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Old Dec 2, 2014 | 04:33 PM
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From: Llandudno, Cape Town, South Africa
late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires
Yep! You guys get really good gas. Consider 95RON as a minimum though.

If you ever detect any pinging, knock, detonation, pre ignition ~ by whatever name you know it, then reconsider.
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Old Dec 2, 2014 | 04:35 PM
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W205 C200 Sport Premium Plus. October 2018. 1497cc with 48 volt battery eq
Originally Posted by Glyn M Ruck
Yep! You guys get really good gas. Consider 95RON as a minimum though.
But all our fuel is expensive.
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Old Dec 2, 2014 | 04:37 PM
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From: Llandudno, Cape Town, South Africa
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Yes ~ indeed it is. All that tax! SA is not far behind. The US enjoys cheap fuel.
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