Slickster514

Any idea or opinion if using 93 or 94 Octane gasoline in a C43 would yield any additional benefits (however small) over the minimum required 91?

zibby43

All I have where I live is 93 octane. Feel bad for those that can only get 91. Haven't seen 94 at the pump, however.

FirstMBAMG

Dieseldan9

iTrader: (1)

Maybe with a tune it would help but not stock

turismo1

Ive used 91 oct and 94 oct and seems the same to me. Without a tune it wouldnt matter.. It just happens that 94 oct here is sometimes almost the same as 91, so depends which gas station im near at hte time.

gtracer

Dont think it'll matter much but for $0.03/liter, its not a bank breaker either. Get a tune and that'll be a good excuse to use 94 Oct

Slickster514

I've read in other forms that some Porsche Turbo model registers less pinging (and timing retard) on 94 vs 91, according to a data logger output. One wonders if the same applies to the C43 which is also a turbo model. But in all fairness, the Porsche in question is designed for 91 minimum / 93 preferred.

MB just states a minimum value of 91, and this in my opinion leave lots of room for speculation.

Slickster514

See below,
This is from New Zealand where 98RON is specified. This is more or less equivalent to 94AKI here in North America.

I really believe that they purposely state 91AKI as the bare minimum in North America because 94AKI is more difficult to obtain in some US states, and Canadian provinces.

C43Ayemgee

All these cars are tuned for 91 octane from factory, any increase in octane would require tuning for any benefit.

Dieseldan9

iTrader: (1)

Is 98ron the same as 94 octane in USA?

Slickster514

Generally yes.
Rule of thumb is to subtract 4 points from RON to get North American AKI rating.

Mikeydif

In theory it will make a difference to the power output. I run mine on 95 Ron (UK). The adverts for fuel that say 98 will improve fuel economy is bollocks. Its all about power output. Some cars have octane sensors that will delay the timing but who knows if the C43 has one.

tres55

I run 94. Mostly because it's another $3 per tank...so who cares. Would rather have the peace of mind with how many times my car redlines. :p