Jun 29, 2015, 02:58 PM
Last edit by: IB Advertising
See related guides and technical advice from our community experts:
Browse all: Specifications and General Maintenance
- Mercedes Benz C-Class: Fuel Economy and Type of Gas to Use
Important information to help you understand your Mercedes-Benz
Browse all: Specifications and General Maintenance
Fuel type
MBWorld Fanatic!
Joined: Oct 2010
Posts: 1,128
Likes: 19
From: Acapulco Mexico
2010 C300 Sport
One wonders if this "octane mentality" extends to brakes, tires, oil, service, etc. I for one would not like to ride in a W204 with brake pads replaced with the "low octane" version.
Junior Member
Joined: Jan 2011
Posts: 16
Likes: 0
c300
MBWorld Fanatic!
Joined: Oct 2008
Posts: 2,601
Likes: 28
From: Atlanta, GA
2008 C300 Sport 6 Speed Manual, 1953 Chevy Bel-Air, 2015 Audi allroad, 1963 Chevy Apache
You are right! We both have 2008 models. My Infinity does have 3 more hp. (317/320 hp). The difference of 3 HP is from the use of 87 octane VS 91 octane. So that's definitely worth the extra .30 cents per gallon I spend on 91 octane. We even get the same gas mileage. You know what I just talked myself into using 87 octane in my QX-56. Thanks guys for this informative, childish rant over what octane to use.
MBWorld Fanatic!
Joined: Feb 2004
Posts: 3,986
Likes: 6
From: SEATTLE WASHINGTON USA
'08 C300 Lux Barolo Red Beige Leather P2 MM 18" wheels '84 944
No mechanic for sure
I don't really have any idea if it harms the car or not. But for me, its not worht saving a possible $150 a year to drive a car that feels sluggish and underpowered on regular and puts a smile on my face with premium. I definitely feel the difference between regular and premium, and sometimes I can feel the difference between fill-ups of gas brands. Heck, I can even notice a difference at my next fillup at the same station.
Also, it doesn't help that the one time I put regular in my c300 and went to start it, the engine misfired and the cel was blinking. I had to turn it off and turn it back on and all was fine. But apparently accoding to my service advisor this can happen where the pistons and the crank become out of sync. He seemed to think that the knock sensors or the misfire from regular gas has caused this. But I'm no mechanic.
Also, it doesn't help that the one time I put regular in my c300 and went to start it, the engine misfired and the cel was blinking. I had to turn it off and turn it back on and all was fine. But apparently accoding to my service advisor this can happen where the pistons and the crank become out of sync. He seemed to think that the knock sensors or the misfire from regular gas has caused this. But I'm no mechanic.
You really have no idea how internal combustion engines work, do you?
MBWorld Fanatic!
Joined: Feb 2004
Posts: 3,986
Likes: 6
From: SEATTLE WASHINGTON USA
'08 C300 Lux Barolo Red Beige Leather P2 MM 18" wheels '84 944
Huh?
You are right! We both have 2008 models. My Infinity does have 3 more hp. (317/320 hp). The difference of 3 HP is from the use of 87 octane VS 91 octane. So that's definitely worth the extra .30 cents per gallon I spend on 91 octane. We even get the same gas mileage. You know what I just talked myself into using 87 octane in my QX-56. Thanks guys for this informative, childish rant over what octane to use.
Member
Joined: Nov 2010
Posts: 158
Likes: 0
From: NJ
2012 C350 coupe
He is talking about the Nissan Armada and Infinity QX-56, with the Infinity having 3 more hp than the Nissan. You probably missed the post that was made before.
MBWorld Fanatic!
Joined: Sep 2009
Posts: 2,108
Likes: 7
From: Dix Hills, New York
2012 C250 Coupe
Haha, you have been really crabby lately. I know the basics on how an internal combustion engine works, I just don't know names for a lot of the engine components. I know that the crankshaft is connected to the pistons, but I was simply relaying what my service advisor told me. I figured he would know more then me, even though I didn't think it made sense. But the bottom line is, I put in regular gas ONCE and got an engine misfire that one time on startup. The CEL was blinking and the problem didn't get fixed until I turned off the engine and restarted. Then all was fine.
MB World Stories
The Best of Mercedes & AMG
8 Classic Boxy Mercedes Designs That Have Aged Like Fine Wine
Verdad Gallardo
Flawlessly Restored Mercedes 190E Evo II Heads to Auction
Verdad Gallardo
Electric Mercedes C-Class Unveiled: 11 Things You Need to Know
Verdad Gallardo
Mercedes EQS Gets A Major Update: Everything You Need to Know
Verdad Gallardo
5 Underrated Mercedes-Benz Models That Don't Get the Love They Deserve
Verdad Gallardo
Mercedes 300D Has Pushed Well Past 1 Million Miles and It Ain't Stopping
Verdad Gallardo
10 Most Reliable Mercedes-Benz Models You Can Buy Used
Verdad Gallardo
Mercedes Teases Updated EQS With Steer-By-Wire and a Yoke
Verdad Gallardo
8 Mercedes Models With Poor Reliability Records
Verdad Gallardo
MBWorld Fanatic!
Joined: Oct 2010
Posts: 1,128
Likes: 19
From: Acapulco Mexico
2010 C300 Sport
Getting back on the octane point... The compression of the 2012 C350 engine is 12.2:1. Turns out 302 HP and has improved torque.
It is doubtful that the ECU, oxygen sensors and crank timing will allow the use of any gasoline below 91 octane.
It is doubtful that the ECU, oxygen sensors and crank timing will allow the use of any gasoline below 91 octane.
Junior Member
Joined: Oct 2010
Posts: 28
Likes: 0
'09 C300 Sport (Manual)
http://www.benzworld.org/forums/w204...injection.html
these systems are a lot more tolerant to knock that just a knock sensor with the ignition (this just retards the timing a bit), the timing of each injector firing directly into each cylinder can be controlled to get detonation back under control. Our 2007 VW GTI (also DI) had 10.3 to 1 before the boost even kicked in and people regularly up the boost on these cars without issues on pump gas.
Member
Joined: Feb 2011
Posts: 103
Likes: 0
From: Richardson TX
c300
Op if your concerned about being cheaper on gas especially since your in a c300 just run e85 easy discussion over... other then that the reg vs premium fuel is a debate that will never end.. cause alot of times you really never know what fuel your running anyways... who knows is the 93 oct is actually that... some gas station owners i know say theres no difference and some just use reg for all 3 grades.. and some say there is a little difference and then you have sunco and they differently say theres a difference.. i'm just glad i can use e85... saving alot of money doing so...
btw not to thread jack but what makes a engine e85 capable??
btw not to thread jack but what makes a engine e85 capable??
Junior Member
Joined: Oct 2010
Posts: 28
Likes: 0
'09 C300 Sport (Manual)
Nothing really different about the engine itself, I converted a regular lawnmower to ethanol. Ethanol (alcohol) tends to dry out regular rubber fuel hoses, so special fuel lines are needed on the car (the C300 has this but the C350 doesn't I'm told). The other thing is the ECU will have to compensate for the difference in readings at the oxygen sensors, e85 tends to lean out the mixture so more fuel needs to be injected to compensate.
Member
Joined: Oct 2009
Posts: 85
Likes: 2
From: Detroit Area
2008 C350 Sport
I thought we beat this horse to death awhile ago...(my post is #34)
https://mbworld.org/forums/c-class-w...ml#post4061335
https://mbworld.org/forums/c-class-w...ml#post4061335
MBWorld Fanatic!
Joined: Feb 2004
Posts: 3,986
Likes: 6
From: SEATTLE WASHINGTON USA
'08 C300 Lux Barolo Red Beige Leather P2 MM 18" wheels '84 944
MB vs lawnmowers
Nothing really different about the engine itself, I converted a regular lawnmower to ethanol. Ethanol (alcohol) tends to dry out regular rubber fuel hoses, so special fuel lines are needed on the car (the C300 has this but the C350 doesn't I'm told). The other thing is the ECU will have to compensate for the difference in readings at the oxygen sensors, e85 tends to lean out the mixture so more fuel needs to be injected to compensate.
I avoid E10 and the closest E85 pump is a 60 mile roundtrip.
We have been through this many times.
i use 93 Premium here in NY.
Senior Member
Joined: Dec 2008
Posts: 312
Likes: 2
C350 Elegance
I'm a real rebel and I follow manufacturer's recommendations to the letter: 91 octane gas (super) for the C350, 100% synthetic motor oil and ATF, 50% antifreeze solution in destilled water, OEM or OEM's supplier filters, brake fluid, pads and rotors, OEM or equal, not equivalent functional parts, gel battery, plus plenty of home made TLC.
If the manufacturer recommends it, why not follow it after I bury a high sum in their product?
If the manufacturer recommends it, why not follow it after I bury a high sum in their product?
