Premium vs Plus gas - Mercedes-Benz Forum

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post #1 of 17 (permalink) Old 05-12-2008, 10:20 AM Thread Starter
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Premium vs Plus gas

Hi,

I have an ML350 and read in the manual that I should only use Premium gas. Would there be any problems if I were to get Plus gas occasionally rather than the recommended premium?

Thanks in advance!
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post #2 of 17 (permalink) Old 05-12-2008, 10:57 AM
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While I cannot speak for Mercedes specifically from experience I did have my sister put mid grade in my Jaguar once when she borrowed it. The car did run poorly and acted almost as if I was running out of gas at times. It drove normally again after a tank or two of premium...
Premium is recommended because that is what that particular engine is designed to use. In my opinion not using premium will effect your cars performance negatively and you may even experience some knock....

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post #3 of 17 (permalink) Old 05-12-2008, 11:05 AM
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Quote:
Originally Posted by melissa25 View Post
Hi,

I have an ML350 and read in the manual that I should only use Premium gas. Would there be any problems if I were to get Plus gas occasionally rather than the recommended premium?

Thanks in advance!
Not recommended. And the cost savings is less than 5%.

S.


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post #4 of 17 (permalink) Old 05-12-2008, 11:20 AM
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Not using premium must be the most popular question on the forum. Use premium.

Mike
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post #5 of 17 (permalink) Old 05-12-2008, 11:33 AM
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In MN Regular is E10 (10% ethanol) while Plus is E15. Often Plus is the same price as Regular. One would think that would be a good deal. More octane for the same price. Unfortunately we have found that you get worse gas mileage running E15 verses E10.

You get the best gas mileage running Premium in MN which is E0. The gas station owner runs Regular around town in his Suburban but on trip he will run Premium. The better gas mileage more than makes up for the price.

So in MN running Plus instead of Premium will more than likely cost more in $/mile.

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post #6 of 17 (permalink) Old 05-12-2008, 01:56 PM
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In short, it depends on your driving.
Have a look at this thread.
http://www.benzworld.org/forums/w163...mium-fuel.html


Quote:
Originally Posted by melissa25 View Post
Hi,

I have an ML350 and read in the manual that I should only use Premium gas. Would there be any problems if I were to get Plus gas occasionally rather than the recommended premium?

Thanks in advance!
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post #7 of 17 (permalink) Old 05-12-2008, 02:34 PM
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Do what the manual says! No more, no less! It will cost you much more than you will save in the long run.

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post #8 of 17 (permalink) Old 05-12-2008, 02:44 PM
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Everybody wants to save a dime. I know gas is expensive but what are we talking about here? $3.00 a fill-up? Use the recommended premium gas.

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post #9 of 17 (permalink) Old 05-12-2008, 07:46 PM
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Mike, Jay, Cmitch,

Melissa asked "Would there be any problems ... ?".
None of your replies addresses that question.
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post #10 of 17 (permalink) Old 05-12-2008, 08:32 PM
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Potentially there could be problem(s) with your engine. It is engineered to run on 91 octane and that is what I would use if I were you. As has already been implied on this thread, a 10 cents/gallon savings is meaningless when compared to what it might cost in engine repairs in the future.

One thought though: In my area, Plus is 89 octane and Super is 93. If that is true in your vicinity, you could save 5 cents/gallon by pumping half and half of those 2 grades.

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Last edited by Musikmann; 05-12-2008 at 08:35 PM.
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