which octane gas for 07 R500? - Mercedes-Benz Forum

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post #1 of 12 (permalink) Old 10-24-2009, 06:46 AM Thread Starter
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which octane gas for 07 R500?

Hi -
Are there really any issues with running 89 in the V8? Has anyone done any testing to see how it effects mpg? and or engine smoothness? I have a friend who's only run 87 and 89 in his R350 and he said in 40k miles he's noticed no problems and upwards of 24 mpg.
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post #2 of 12 (permalink) Old 10-24-2009, 08:32 AM
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Like the Fram guy used to say, you can pay the service station now or your mechanic (in spades) later.

Go with the Premium, go by the Book.
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post #3 of 12 (permalink) Old 10-24-2009, 11:49 AM
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I have a friend who's only run 87 and 89 in his R350 and he said in 40k miles he's noticed no problems and upwards of 24 mpg.
Sorry to hear that your friend has fallen on such hard times. Can you give us his name so that none of us accidentally buys his car.
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post #4 of 12 (permalink) Old 10-24-2009, 12:09 PM Thread Starter
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Ha ha. Well...he's a third year surgery resident and IS from India...so maybe that has something to do with it. Money is tight.

I have just never owned a vehicle where the manu. recommended 91+ octane. It's only $3 more or so a fill up...less than $30/month so I was too worried about it...but I do like to be informed.

I wish I was more mechanically intelligent.
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post #5 of 12 (permalink) Old 10-24-2009, 02:33 PM
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I have just never owned a vehicle where the manu. recommended 91+ octane. It's only $3 more or so a fill up...less than $30/month so I was too worried about it...but I do like to be informed.

I wish I was more mechanically intelligent.
If $30 a month on gas makes some sort of difference in your budget, you might want to reconsider have any MB in the garage; they cost money to maintain. Most, if not all, MB products in the last 10 years or longer require premium fuel for optimum performance. They are designed that way. People sometimes think MB requires premium fuel just to add to the already hefty tab of owning one. Yes, you can drive the car on 87 octane. The EMC will adjust the spark advance to accommodate the lower octane. You will also get less performance, poorer fuel economy, and shorter engine life because of the ignition characteristics of low-octane fuel in an engine designed for high-octane. (You will now hear the noise of people who disagree with that--usually of the "I never put anything but 87 octane in my car and it's just fine and gets the same gas mileage." They don't know that, they are compensating for their cheapness.) If the car calls for 91+ octane, just burn that in the car and stop looking for a loophole.

If you want to be more mechanically intelligent, read this forum and the one for your vehicle and learn. I don't know anyone born with mechanical intelligence. I chide my physician friends for having an easier job than my mechanic. Every single human being has their heart, liver, lungs, and so on in the same spot. Their job is simple. Mechanics have a much tougher time. Every car is different.

"Don't pick a fight with an old man. If he is too old to fight, he'll just kill you."--John Steinbeck
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post #6 of 12 (permalink) Old 10-24-2009, 02:36 PM
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BTW--how long is your commute that you burn a tank of fuel every three days? You mentioned $3 a fill, or $30 a month which implies you burn 10 tanks of fuel a month. You're gonna have a high-mileage car before long.

"Don't pick a fight with an old man. If he is too old to fight, he'll just kill you."--John Steinbeck
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post #7 of 12 (permalink) Old 10-24-2009, 02:43 PM Thread Starter
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thanks for the reply...

I would have to question that an auto mechanic has more intelligence than an MD...different brain operations, maybe. But then again...I guess it depends on your speciality. Internal Medicine, Family, Ped's...maybe...or if you're a D.O. definitely. =) Podiatrist...for sure.

Thanks for the reply. I had intended to burn the high octane simply because it wouldn't cost a whole hell of a lot more per fill up just to stay on the safe side...but, in a world full of marketing ploys I just wasn't sure if it was absolutely required. And I took my kind friend from oversea's opinion with a grain of salt.

Guess I'll burn the airline fuel. Thanks again.
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post #8 of 12 (permalink) Old 10-24-2009, 02:45 PM Thread Starter
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BTW--how long is your commute that you burn a tank of fuel every three days? You mentioned $3 a fill, or $30 a month which implies you burn 10 tanks of fuel a month. You're gonna have a high-mileage car before long.
I was pressed with a 19 month old screaming at my feet...I was trying to say I wasn't worried about the additional costs and my commute is only 1.5 miles/day. Hardly enough to worry about the additional fuel costs. Sorry...
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post #9 of 12 (permalink) Old 10-24-2009, 02:49 PM Thread Starter
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Oh I see what you're saying. I was saying it's less than $3 per tank of gas. .30 more at 10 gallons = $3 more per tank than the cheap stuff. tank a week = $12/month. Driving a whole lot still less than $20/month. 10 gallon tank being conservative.
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post #10 of 12 (permalink) Old 10-24-2009, 08:37 PM
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Guess I'll burn the airline fuel. Thanks again.
Another misconception, that triple digit octane must be "better." It's not, since the higher octane rating means that the fuel is harder to detonate under compression, so you may end up sending a lot more unburned fuel towards your catalytic converter, making it's life shorter.

Really can't go wrong following the Owner's Manual's sage advice.
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