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post #1 of 47 (permalink) Old 04-15-2010, 05:11 PM Thread Starter
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Fuel

I have a 2006 ML350 and I wanted to know if I didn't use premium fuel, could it hurt the engine? I use the unleaded regular stuff, 87 octane I think.

Anyone know if it will make a big difference?
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post #2 of 47 (permalink) Old 04-15-2010, 06:35 PM
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All Mercedes-Benz gasoline fueled products REQUIRE premium. You cannot use lower grades of fuel, unless it is an emergency. You will destroy your catalytic converters burning 87, which will void your emissions warranty. You also lower your MPG, thus erasing any pump savings you think you may have achieved. If you are too cheap to purchase the correct grade gas, then you shouldn't drive a Mercedes Benz.
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post #3 of 47 (permalink) Old 04-15-2010, 06:44 PM Thread Starter
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Ok, I was curious if it would make a difference hahaha. LOL, you're trying to tell me what I can and can not do over the internet? LOL, It's my car, and Ill do whatever I want with it. No need to get all defensive sounding.

The dealer never told us that we needed to have premium gas, so we didn't put it in. We get 22 MPGs in it anyway.
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post #4 of 47 (permalink) Old 04-15-2010, 06:51 PM
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Ok, I was curious if it would make a difference hahaha. LOL, you're trying to tell me what I can and can not do over the internet? LOL, It's my car, and Ill do whatever I want with it. No need to get all defensive sounding.

The dealer never told us that we needed to have premium gas, so we didn't put it in. We get 22 MPGs in it anyway.
I'm trying to tell you that it doesn't make any sense because you are actually spending more money then you are saving. Catalytic converters are not exactly cheap to buy. They cost $1060 for the right and $1070 for the left. There are two per ML. A grand total of $2130 plus installation billed at $135-150/hour. Seems like a giant waste of money to me, which can easily be saved by using the correct grade of gas. The word "required" is used only 100 times in the manual and then in big bold letters on the fuel door. I guess you missed that part.
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post #5 of 47 (permalink) Old 04-15-2010, 09:43 PM
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The dealer never told us that we needed to have premium gas, so we didn't put it in. We get 22 MPGs in it anyway.
Not that long ago government told some dealers to run the car on mixture of acid and sand.
They surprisingly run pretty long. .... relatively speaking

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post #6 of 47 (permalink) Old 04-16-2010, 05:26 AM
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This is one of the most often asked question on the forum. Do not be offended! You might save a little at the pump but you will have to pay when your cats go. Trust me on this. You will pay more in the end. I have had to change the cats on 2 different mercedes. Once I paid to have it done and it cost a pretty penny and once a buddy and I did it. Cost way less but it was a pain.

Like you said it is your car but if you are asking if there will be issues if you do not use premium- I would say most likely, yes.

Mike
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post #7 of 47 (permalink) Old 04-16-2010, 09:01 AM
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Garage
87 octane penalty

You will pay a penalty in performance. The knock sensor will prevent destructive engine knock but it does so by automatically retarding your ignition timing. This will result in slower acceleration and poorer fuel economy. There may also be a penalty in long term engine repair costs but I doubt anyone short of a bona-fide current Benz mechanic can tell us what that is despite what others say.

Look at it this way; at a $00.20 difference between regular and premium fuel, you are talking about an additional $4.00 for 20 gallons. If that diffence is worth it to you, by all means continue to use regular fuel.
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post #8 of 47 (permalink) Old 04-16-2010, 09:20 AM
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The dealer never told us that we needed to have premium gas, so we didn't put it in. We get 22 MPGs in it anyway.
Ah, but he gave you an owners manual. Can you read?

Kent Christensen
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post #9 of 47 (permalink) Old 04-16-2010, 09:24 AM
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Did the dealer also told you you can tow 40 foot travel trailer with your ML?
Look at it this way. You paid for 6 cylinder vehicle with life expectancy of 300k miles.
Running it on regular will make it performing like 4 cylinder and lasting probably below 200k.
Why didn't you buy KIA in the first place?
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post #10 of 47 (permalink) Old 04-16-2010, 09:24 AM
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The dealer never told us that we needed to have premium gas, so we didn't put it in. We get 22 MPGs in it anyway.
Hmm, why would a dealer tell you such a thing? Maybe because they'd like to make some money from servicing your ML because you damaged components by using regular gas?

1981 300SD DB881 ext./code #236 leather int. aka: thistle green ext./olive int.
1982 300D, DB877 ext./code #135 mb-tex int. aka: petrol green ext./creme int.
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