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#4720949 - 04/08/18 09:09 PM MB gasoline - regular vs premium
MaximaGuy Offline


Registered: 09/20/03
Posts: 1237
Loc: Austin, TX
The MB from my signature calls for premium gas, was wondering why regular won't work.

Other owners chime in - other than premium results is less knock, anything out of the ordinary that regular fuel won't work.
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#4720955 - 04/08/18 09:16 PM Re: MB gasoline - regular vs premium [Re: MaximaGuy]
Aichiguy Offline


Registered: 08/10/17
Posts: 81
Loc: Iowa
Knock can damage an engine. Surely on an 18 there's a knock sensor that causes the computer to retard timing to alleviate this which would result in lower performance.
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#4720957 - 04/08/18 09:16 PM Re: MB gasoline - regular vs premium [Re: MaximaGuy]
Nick1994 Offline


Registered: 02/19/13
Posts: 10314
Loc: Phoenix, AZ
12:1 compression ratio, and a price tag that start at like $60k.
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#4720960 - 04/08/18 09:18 PM Re: MB gasoline - regular vs premium [Re: MaximaGuy]
bbhero Offline


Registered: 03/20/15
Posts: 4746
Loc: Virginia
Ahh a higher compression motor is very likely the reason for needing the higher octane gas. And if you have money to buy or lease a MB then why worry about an extra 50-60 cents a gallon. A extra $10-13 per fill up from dead empty really going to break the bank for you?? I hope not.

I do not mean to give you a hard time here. Just thinking about it all. Really difficult to understand why when people buy or lease a expensive vehicle they suddenly cringe about having to put "expensive" gas in the expensive vehicle they just bought or leased. And don't expect your tires or other needs for that vehicle won't be expensive as well. Because they very likely will be.


Edited by bbhero (04/08/18 09:21 PM)
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#4720971 - 04/08/18 09:23 PM Re: MB gasoline - regular vs premium [Re: MaximaGuy]
MaximaGuy Offline


Registered: 09/20/03
Posts: 1237
Loc: Austin, TX
Concur its not breaking my wallet.
BTW knock and retardation is under load or heavy acceleration and regular driving conditions one never knocks under normal loading.
Curious if the vehicle is designed to only take premium, my Lexus takes regular
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#4720981 - 04/08/18 09:29 PM Re: MB gasoline - regular vs premium [Re: MaximaGuy]
Wolf359 Offline


Registered: 04/27/12
Posts: 4907
Loc: MA
Yes, just read the manual. Says minimum octane is 91. Not sure if Texas has 93 or 91. If you had 93, you could make a mix of regular super to get 91. There's usually a section in the manual that says if 91 isn't available, use 87, but not to give it wide open throttle and use a light throttle and fill up as soon as possible with super.

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#4720983 - 04/08/18 09:31 PM Re: MB gasoline - regular vs premium [Re: MaximaGuy]
madRiver Online   content


Registered: 07/11/15
Posts: 3610
Loc: New England
Besides the power loss expect a mpg loss of vehicle requires premium.

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#4720990 - 04/08/18 09:41 PM Re: MB gasoline - regular vs premium [Re: MaximaGuy]
bbhero Offline


Registered: 03/20/15
Posts: 4746
Loc: Virginia
Still it is a higher compression motor... Being that is what it is.. it could very possibly knock even under "regular" acceleration if running regular gas in a motor with that high a compression. Heck my Nissan Altima 3.5 VQ has a 10.4:1 compression motor and it is set to run the best on 93. Says so in the manual. I'm glad that extra $10-12 ain't hurting you too bad at all. That's a very good thing smile
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#4720997 - 04/08/18 09:55 PM Re: MB gasoline - regular vs premium [Re: MaximaGuy]
slacktide_bitog Offline


Registered: 03/20/08
Posts: 6388
Loc: USA
It's DI. Use premium

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#4721000 - 04/08/18 09:58 PM Re: MB gasoline - regular vs premium [Re: MaximaGuy]
Trav Offline


Registered: 11/20/06
Posts: 19346
Loc: MA, Mittelfranken.de
Questions like effects of detonation on direct injectors and combustion chamber deposits due to retarded ignition timing come to mind.
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#4721004 - 04/08/18 10:02 PM Re: MB gasoline - regular vs premium [Re: MaximaGuy]
aquariuscsm Offline


Registered: 12/30/06
Posts: 18309
Loc: Dallas,Tx USA
Your engine will ping under heavy acceleration on regular unleaded.
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#4721014 - 04/08/18 10:14 PM Re: MB gasoline - regular vs premium [Re: MaximaGuy]
Stevie Offline


Registered: 11/08/04
Posts: 222
Loc: Port Aransas, TX
Originally Posted By: MaximaGuy
The MB from my signature calls for premium gas, was wondering why regular won't work.

Other owners chime in - other than premium results is less knock, anything out of the ordinary that regular fuel won't work.


My Last MB SLK Supercharged the owners manual said only use premium or engine damage "WILL" occur.

My 2013 SLK says use premium fuel.

It's a Mercedes! Use premium and enjoy the premium ride.

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#4721033 - 04/08/18 10:39 PM Re: MB gasoline - regular vs premium [Re: MaximaGuy]
oldhp Offline


Registered: 06/28/12
Posts: 1658
Loc: USA
24.6 gallon fuel tank. Lets say you let it run down to 4.6 gals in the tank. Manual says 91 or higher octane fuel. So if you mix 6 gals 87 octane plus 14 gals 93 fuel you get 91 octane, and you save $3.00 per tank figuring .50 cents a gal savings. At $3.00 per tank per week, 52 weeks a year you would save $156.00 a year. I don't about you, but having to mix fuel to save $156.00 ain't worth it. grin
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#4721060 - 04/08/18 11:05 PM Re: MB gasoline - regular vs premium [Re: MaximaGuy]
NoNameJoe Offline


Registered: 06/03/15
Posts: 440
Loc: New York
Quote:
BTW knock and retardation is under load or heavy acceleration and regular driving conditions one never knocks under normal loading.

What's "regular driving conditions"? Because you know it's not just the car but also a host of other variables that are different.

Like summer and winter blends and even the temperature of the engine, fuel or air which is seasonal. If they designed it for 91, going to 87 may not be enough to account for other variables.

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#4721063 - 04/08/18 11:07 PM Re: MB gasoline - regular vs premium [Re: MaximaGuy]
ruhroh Offline


Registered: 12/11/16
Posts: 112
Loc: NC
Your car will adjust the timing to prevent knock, but the small fuel economy loss might take out the savings from not running plus/premium anyway.

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