Use of regular grade gasoline in V12 - Mercedes-Benz Forum

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post #1 of 19 (permalink) Old 06-11-2010, 08:14 PM Thread Starter
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Use of regular grade gasoline in V12

I am looking at purchasing a 95' SL600 AMG and I cannot get 'premium' gasoline in my locale and the owners manual seems to insist upon the need for premium only.
Are there no anti-knock sensors in this motor to retard the timing and allow the use of regular grade fuels. My old Northstar equipped STS recommended premium also but ran well for 13 years on nothing but regular fuel.
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post #2 of 19 (permalink) Old 06-12-2010, 02:05 PM
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You cannot get premium or you are too much of a cheap a$$ to buy it? ALL Mercedes gasoline powered vehicles REQUIRE premium fuel.
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post #3 of 19 (permalink) Old 06-12-2010, 02:21 PM Thread Starter
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regular fuel in V12

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Originally Posted by mr.xpowerseller View Post
You cannot get premium or you are too much of a cheap a$$ to buy it? ALL Mercedes gasoline powered vehicles REQUIRE premium fuel.
thank you for your compassion and understanding for those of us that live in remote areas of the world so that those of you who don't can go home with something in your grocery cart. Being the type person that I am I have no difficulty in forgiving you for your ignorance of what goes on outside of your own little urban enclave
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post #4 of 19 (permalink) Old 06-12-2010, 02:39 PM
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I agree that the stereo-type wasn't such a great idea, but if you really are just cheapo (not saying you are) than you don't deserve a Mercedes. Besides what kind of farmer wants to buy a SL Mercedes if they live in such a remote area. Are you going to take it out and drive it on all those dirt roads cause that is just so great for a car.
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post #5 of 19 (permalink) Old 06-12-2010, 03:03 PM
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We do have members here who drive in countries where Premium gasoline is not available and per reports those cars perform just fine on regular, or whatever they can buy there. One of them drive ML55 what is high performance engine.
I would compare compression ratio of questioned car to others and buy a case of octane booster.
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post #6 of 19 (permalink) Old 06-12-2010, 03:11 PM Thread Starter
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Originally Posted by Kajtek1 View Post
We do have members here who drive in countries where Premium gasoline is not available and per reports those cars perform just fine on regular, or whatever they can buy there. One of them drive ML55 what is high performance engine.
I would compare compression ratio of questioned car to others and buy a case of octane booster.
thank you, I will do some research into the compression ratio of an KL55 and compare. My friend from abovE here has apparently never experienced the silence and the thrill of a dirt road at 200 KPH but those days are pretty much all behind me now
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post #7 of 19 (permalink) Old 06-12-2010, 05:54 PM
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Personal attacks are such a kind response to those seeking helpful information. Some of us use fuels other than premium because it gives better performance, some because they can't get their preferred fuel.

Octane is all about compression, higher octane allows the fuel to be compressed more before it explodes. It is by no means settled that all Mercedes require the use of only premium fuel. The 12 cylinder V12 has a surprisingly low compression ratio of 9.0:1, lower than a 2006 Chevy Malibu which comes in at 10.4:1 with a recommendation to use regular. My 1991 300E has a compression ratio of 9.2:1 and runs better, in all regards, on mid-grade rather than premium.

One of the posters to this thread often recycles many popular myths about octane and the supposed ill-effects of running less than premium in a MB that routinely resurface on this board--killing catalytic converters, fouling injectors, destroying pistons, poor mileage and performance. Not happening. People are mostly repeating hearsay. Knowledgeable experts agree that lower octane will not damage a vehicle and that it is likely to have little impact on performance.

The biggest determinant of a fuel's impact on a vehicle is quality, and it should be noted that the detergent quality of a particular brand of fuels is likely to be identical across their product line. Bad tanks and low quality suppliers can, and have, made a big difference.

Most all of the user comments on octane I have seen on this forum have been opinions based on personal experience, usually second-hand and anecdotal. Few users are citing data and fewer still are acknowledged experts. As one poster to this thread says in his signature: "One anecdotal story does not constitute a statistic."

One of my previous postings on this topic, found here, cites experts ranging from a well-regarded participant on this board to senior people at Mercedes, Porsche and the Society of Automotive Engineers. I believe it's worth reading.

Last edited by 300E91; 06-12-2010 at 05:59 PM.
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post #8 of 19 (permalink) Old 06-12-2010, 06:03 PM
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Quote:
Originally Posted by twooldfarmers View Post
thank you for your compassion and understanding for those of us that live in remote areas of the world so that those of you who don't can go home with something in your grocery cart. Being the type person that I am I have no difficulty in forgiving you for your ignorance of what goes on outside of your own little urban enclave
You never answered my question.
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post #9 of 19 (permalink) Old 06-12-2010, 06:17 PM
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Quote:
Originally Posted by mr.xpowerseller View Post
You never answered my question.
I believe he answered it in his original post, even before you asked.

Quote:
Originally Posted by twooldfarmers View Post
. . . I cannot get 'premium' gasoline in my locale . . .
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post #10 of 19 (permalink) Old 06-13-2010, 07:40 AM
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Compression ratio does not tell the story. BMEP does. You can have huge compression, leave the valves open longer, and reduce BMEP. And if the engine has any type of forced induction, then compression ratios certainly must be considered, but intake compression must be considered as well.

Variable valve timing helps bring up BMEP. Look at the torque bands on a Benz engine vs that Chevy engine. Tells the story.

But if the engine does have <functioning> knock sensors and the system <does> retard timing, then yes, just about any grade of gasoline will work. Power will be greatly reduced. So, having said that, unless this V12 powered vehicle is almost free, I would go with something less complex, easier to maintain, and cheaper to maintain. What is the point of all the extra cost if the power is not available to use?

Your call twooldfarmers. BTW - care to share with us your remote region?

Thanks!
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Last edited by waybomb; 06-13-2010 at 10:51 AM.
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