Would You Run 100 Octane Gasoline in YOUR Benz? - Mercedes-Benz Forum

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post #1 of 20 (permalink) Old 08-25-2016, 04:03 PM Thread Starter
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Would You Run 100 Octane Gasoline in YOUR Benz?

Of course the price might be a limiting factor, but otherwise, would you do it?
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post #2 of 20 (permalink) Old 08-25-2016, 04:30 PM
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No for two reasons. First, unless you add more advance it is a waste. Second, fuel gets thinner as it goes up in octane and it tends to run richer.
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post #3 of 20 (permalink) Old 08-25-2016, 04:49 PM
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Nope, waste of money. I have run it in my Dino in the past, mixed with premium to get the octane rating up a little. Seemed to run a little better, but not enough to warrant regular fill ups at the Sunoco station that used to sell it.

But modern, fuel injected Mercedes? No benefit, and a ton of money.

D

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post #4 of 20 (permalink) Old 08-25-2016, 05:12 PM
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No reason to!

When out on the road, it's always best to watch out for Pot holes, Sink holes, and those other Holes!

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You can't get us confused. I'm also "Nice", but NYYYCE is NEVER "Easy"!
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post #5 of 20 (permalink) Old 08-25-2016, 05:43 PM
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Years ago driving in Yugoslavia, I filled up Fiat 125 with 100 octane.
Fiat was design for 94 octanes and thanks to 100 I could climb the grades on top gear at 1200 rpm and no pinging.
The same I was doing with our family 1984 Volvo DL driven in California.
The 4-banger design for regular was struggling on our 20 miles long grades. Once I fill it up with Premium, I could climb the grades without downshifting, eventually getting my money back on fuel saving.
320 has ping sensors, so I never hear it pinging even when I push it hard but I wonder if computer is not changing the ignition point in those situations.
Meaning 100 octane Premium should give it better performance. Not enough to measure on the road, but still.

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post #6 of 20 (permalink) Old 08-25-2016, 05:52 PM
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Warning, science content.

The higher the octane rating of the fuel, the LESS it has available power per given quantity. This is due to the HIGHER activation energy of higher octane fuels. The higher activation energy means more resistance to knock, which means engine management software can advance the ignition timing more, making more efficient use of the available energy of the air/fuel charge (in layman's terms, you are using up more energy to start the reaction of combustion, instead of using that energy in pushing the piston downwards). In other words, if ignition timing were constant, lower octane fuels would give you more power (assuming they are not diluted with alcohol, and the additives package is identical). Now suppose your engine is already tuned to the point where the pressure front in the combustion chamber meets the piston at EXACTLY top dead center, advancing the timing further would give you no benefit, and would actually cause you to loose power AND knock, regardless of the knock resistance of the fuel (but now we are knocking for an entirely different reason, it's not knocking due to pre-igntion, but rather because your ignition trim is past fully advanced). No street engine could benefit from this.

Assuming no additives are used in this fuel, which I doubt VERY much, the only way to get 100 octane fuel is with pure 2,2,4-Trimethylpentane, which as far as I know is impossible with current fuel distillation methods (at least with those for mass production of fuel, which racing fuel falls under the category of). So I'd already be dubious of the effects those additives have on your car and on the environment. Keep in mind race cars basically run on premium, including but not limited to Formula 1. I doubt any race car uses fuel with an octane rating higher than 95. Formula one engines make their power by having MUCH tighter piston tolerances than street engines. Which is why Formula one cars are always plugged into machines that keep the oil and coolant hot and circulated through the engine, even during transport! Those kinds of engines wouldn't need higher octane ratings than what's available in the pump to make more power.

I would not put that in my car.
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post #7 of 20 (permalink) Old 08-25-2016, 05:59 PM Thread Starter
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For the record I wouldn't put it in my car, even if it wasn't $8/US gallon. I told a coworker that it was available and I thought he was going to wet himself. He drives a 2016 Didge Challenger.
There is a dirt race track near here and I'm sure that's why it's offered for sale.
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post #8 of 20 (permalink) Old 08-25-2016, 07:08 PM
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All I am going to say is do not get me stared on this again.

If the car is setup to run on it then use it. If it is a stock factory setup then just run 91-93 octane.

It ain't rocket science.
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post #9 of 20 (permalink) Old 08-25-2016, 07:10 PM Thread Starter
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Trying to get you started dude that's the whole point lol
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post #10 of 20 (permalink) Old 08-25-2016, 08:49 PM
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If it wasn't rocket science, why would our engines have knock sensors?
We do have stations with racing fuel south of Livermoore in Bay Area. Did not check 100 octanes pricing, but they do have low price on diesel.
Also remember racing pumps at Wendover - close to Bonneville Salt Flats


Last edited by Kajtek1; 08-25-2016 at 08:53 PM.
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