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MB gasoline - regular vs premium #4720949
04/08/18 08:09 PM
04/08/18 08:09 PM
Joined: Sep 2003
Posts: 1,341
Austin, TX
MaximaGuy Offline OP
MaximaGuy  Offline OP
Joined: Sep 2003
Posts: 1,341
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.


2018 MB GLE350
2011 Lexus ES350
2006 Toyota Highlander 4WD
Re: MB gasoline - regular vs premium [Re: MaximaGuy] #4720955
04/08/18 08:16 PM
04/08/18 08:16 PM
Joined: Aug 2017
Posts: 102
Iowa
Aichiguy Offline
Aichiguy  Offline
Joined: Aug 2017
Posts: 102
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.


2017 Toyota Camry 2.5
2011 Toyota Camry 2.5 75k
2003 Toyota Camry 2.4 201 k
1999 Ford F150 4.6 70k
Re: MB gasoline - regular vs premium [Re: MaximaGuy] #4720957
04/08/18 08:16 PM
04/08/18 08:16 PM
Joined: Feb 2013
Posts: 11,196
Phoenix, AZ
Nick1994 Offline
Nick1994  Offline
Joined: Feb 2013
Posts: 11,196
Phoenix, AZ
12:1 compression ratio, and a price tag that start at like $60k.


2015 Hyundai Sonata 2.4L 90k Motorcraft Synthetic Blend 5w30 & OEM
2000 Toyota Camry 2.2L 232k Valvoline 5w30 & Fram Ultra
1996 Jeep Cherokee 4.0L 148k Mobil 1 HM 10w40 & Fram Ultra
Re: MB gasoline - regular vs premium [Re: MaximaGuy] #4720960
04/08/18 08:18 PM
04/08/18 08:18 PM
Joined: Mar 2015
Posts: 5,602
Virginia
bbhero Offline
bbhero  Offline
Joined: Mar 2015
Posts: 5,602
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.

Last edited by bbhero; 04/08/18 08:21 PM.

Nissan Altima 3.5 Coupe
Mobil Super 5w30 Wix 57356
"Treat your family like your friends and treat your friends like your family."
Re: MB gasoline - regular vs premium [Re: MaximaGuy] #4720971
04/08/18 08:23 PM
04/08/18 08:23 PM
Joined: Sep 2003
Posts: 1,341
Austin, TX
MaximaGuy Offline OP
MaximaGuy  Offline OP
Joined: Sep 2003
Posts: 1,341
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


2018 MB GLE350
2011 Lexus ES350
2006 Toyota Highlander 4WD
Re: MB gasoline - regular vs premium [Re: MaximaGuy] #4720981
04/08/18 08:29 PM
04/08/18 08:29 PM
Joined: Apr 2012
Posts: 5,775
MA
Wolf359 Offline
Wolf359  Offline
Joined: Apr 2012
Posts: 5,775
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.

Re: MB gasoline - regular vs premium [Re: MaximaGuy] #4720983
04/08/18 08:31 PM
04/08/18 08:31 PM
Joined: Jul 2015
Posts: 4,149
New England
madRiver Offline
madRiver  Offline
Joined: Jul 2015
Posts: 4,149
New England
Besides the power loss expect a mpg loss of vehicle requires premium.

Re: MB gasoline - regular vs premium [Re: MaximaGuy] #4720990
04/08/18 08:41 PM
04/08/18 08:41 PM
Joined: Mar 2015
Posts: 5,602
Virginia
bbhero Offline
bbhero  Offline
Joined: Mar 2015
Posts: 5,602
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


Nissan Altima 3.5 Coupe
Mobil Super 5w30 Wix 57356
"Treat your family like your friends and treat your friends like your family."
Re: MB gasoline - regular vs premium [Re: MaximaGuy] #4720997
04/08/18 08:55 PM
04/08/18 08:55 PM
Joined: Mar 2008
Posts: 7,524
USA
slacktide_bitog Online content
slacktide_bitog  Online Content
Joined: Mar 2008
Posts: 7,524
USA
It's DI. Use premium

Re: MB gasoline - regular vs premium [Re: MaximaGuy] #4721000
04/08/18 08:58 PM
04/08/18 08:58 PM
Joined: Nov 2006
Posts: 20,777
MA, Mittelfranken.de
Trav Offline
Trav  Offline
Joined: Nov 2006
Posts: 20,777
MA, Mittelfranken.de
Questions like effects of detonation on direct injectors and combustion chamber deposits due to retarded ignition timing come to mind.


ASE L1, Master. Deutsch Meisterbrief.
Re: MB gasoline - regular vs premium [Re: MaximaGuy] #4721004
04/08/18 09:02 PM
04/08/18 09:02 PM
Joined: Dec 2006
Posts: 19,251
Dallas,Tx USA
aquariuscsm Online content
aquariuscsm  Online Content
Joined: Dec 2006
Posts: 19,251
Dallas,Tx USA
Your engine will ping under heavy acceleration on regular unleaded.


1996 Nissan 300ZX 5-speed,Arctic Pearl(#175 of 300)
Quaker State Ultimate Durability 10W30
2012 Honda Accord Coupe EX-L 2.4,auto,San Marino Red
Pennzoil Platinum 5W20

Re: MB gasoline - regular vs premium [Re: MaximaGuy] #4721014
04/08/18 09:14 PM
04/08/18 09:14 PM
Joined: Nov 2004
Posts: 251
Port Aransas, TX
Stevie Offline
Stevie  Offline
Joined: Nov 2004
Posts: 251
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.

Re: MB gasoline - regular vs premium [Re: MaximaGuy] #4721033
04/08/18 09:39 PM
04/08/18 09:39 PM
Joined: Jun 2012
Posts: 1,780
USA
oldhp Offline
oldhp  Offline
Joined: Jun 2012
Posts: 1,780
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


2018 RAM 1500 3.6/8 speed.
2017 Jeep Sahara Unlimited 3.6
"U kan't fixe it......if'n it ain't broke."
Re: MB gasoline - regular vs premium [Re: MaximaGuy] #4721060
04/08/18 10:05 PM
04/08/18 10:05 PM
Joined: Jun 2015
Posts: 558
New York
NoNameJoe Offline
NoNameJoe  Offline
Joined: Jun 2015
Posts: 558
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.


2015 Civic LX Coupe
Re: MB gasoline - regular vs premium [Re: MaximaGuy] #4721063
04/08/18 10:07 PM
04/08/18 10:07 PM
Joined: Dec 2016
Posts: 128
NC
ruhroh Offline
ruhroh  Offline
Joined: Dec 2016
Posts: 128
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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