Go Back  MBWorld.org Forums > Mercedes-Benz Sedans > C-Class (W204)
what grade gas do you guys use for C300? >

what grade gas do you guys use for C300?

Notices
C-Class (W204) 2008 - 2014: C180K, C200K, C230, C280, C300, C350, C200CDI, C220CDI, C320CDI

what grade gas do you guys use for C300?

 
Old 03-23-2011, 07:59 PM
  #51  
Junior Member
 
Join Date: Sep 2010
Location: NJ
Posts: 67
Likes: 0
Liked 0 Times in 0 Posts
Mercedes Benz C300 4matic 1967 Chevelle SS
Originally Posted by noka View Post
I was not advocating otherwise. btw, thanks for all the fun facts but I was only questioning whether lower octance fuel burns at a slower rate (what you said), or whether it ignites at a lower temperature and also whether using higher octance fuel than recommended by the manufacturer will result in better gas mileage (which I say is not true).

I think my previous posts answers all questions; higher octane gas than the manufactuer recommends does in fact result in better MPG in some vehicles according to Car and Drivers test results with the BMW M3.
(See my above post).

(The 2001 - 2007 BMW M3 with the S54 engine is one such car. Car and Driver magazine dyno tested a car and found that the power output increased as the AKI was increased up to approximately 96 AKI. Also, these systems can result in HIGHER FUEL MILEAGE MPG for cars designed for the HIGHER OCTANE fuels.)

Last edited by 4maticbenz; 03-23-2011 at 08:02 PM.
4maticbenz is offline  
Old 03-23-2011, 08:04 PM
  #52  
Junior Member
 
Join Date: Sep 2010
Location: NJ
Posts: 67
Likes: 0
Liked 0 Times in 0 Posts
Mercedes Benz C300 4matic 1967 Chevelle SS
Originally Posted by jctevere View Post
Yes, I do know that the only difference between the gas chains are the additive packages... That is what I said in my post. Which is why I have recommended every couple thousand miles to switch the brand of gasoline. I have read many reports and talked with people familiar to the subject. After a while (thousands of miles on the same gas), the additives themselves start to build up, so it would be best to switch the gas brand to get some different additives in to take care of buildup that not only that particular additive can't remove, but also to help remove buildup of the first additive.

While Porsche does reccomend fuel additives like Techron, Mercedes Doesn't. Soemthing to do about having an adverse effect elsewhere along the chain and drying out some lines. But I'm no expert...
Unfortunately, the additives in gasoline are not enough to keep deposits from building, no matter how often you switch gasoline brands. You really need to use a seperate additive every 15,000 miles or so for optimal fuel system cleansing.
4maticbenz is offline  
Old 03-23-2011, 10:39 PM
  #53  
MBWorld Fanatic!
 
Join Date: Aug 2004
Location: MA
Posts: 1,367
Likes: 0
Liked 1 Time in 1 Post
'15 E350 4M Sport
Originally Posted by 4maticbenz View Post
I think my previous posts answers all questions; higher octane gas than the manufactuer recommends does in fact result in better MPG in some vehicles according to Car and Drivers test results with the BMW M3.
(See my above post).

(The 2001 - 2007 BMW M3 with the S54 engine is one such car. Car and Driver magazine dyno tested a car and found that the power output increased as the AKI was increased up to approximately 96 AKI. Also, these systems can result in HIGHER FUEL MILEAGE MPG for cars designed for the HIGHER OCTANE fuels.)
In a previous post, I said that you said that lower octane fuel burns at a slower rate. I was incorrect. You said that's the case for higher octane fuel. I did find some references that indicated that was true. However, most references I found said that using a higher octane fuel than recommended by the manufacturer was a waste of money and did not increase gas mileage.
noka is offline  
Old 03-26-2011, 12:31 PM
  #54  
Junior Member
 
Join Date: Sep 2010
Location: NJ
Posts: 67
Likes: 0
Liked 0 Times in 0 Posts
Mercedes Benz C300 4matic 1967 Chevelle SS
Originally Posted by noka View Post
In a previous post, I said that you said that lower octane fuel burns at a slower rate. I was incorrect. You said that's the case for higher octane fuel. I did find some references that indicated that was true. However, most references I found said that using a higher octane fuel than recommended by the manufacturer was a waste of money and did not increase gas mileage.

Usually using a higher octane fuel than recommended by the OEM will not result in higher MPG, but in a few vehicles, esp. high performance ones, it will.
4maticbenz is offline  
Old 03-26-2011, 12:45 PM
  #55  
Super Member
 
itsLoonie's Avatar
 
Join Date: Nov 2008
Location: CALIFORNIA
Posts: 734
Likes: 0
Liked 1 Time in 1 Post
2012 E350 RWD
E85 @ 3.39/gal
itsLoonie is offline  
Old 03-26-2011, 08:49 PM
  #56  
MBWorld Fanatic!
 
jctevere's Avatar
 
Join Date: Sep 2009
Location: Dix Hills, New York
Posts: 2,108
Likes: 0
Liked 2 Times in 2 Posts
2012 C250 Coupe
Originally Posted by itsLoonie View Post
E85 @ 3.39/gal
That's EXPENSIVE... Here on Long Island (where gas is relatively expensive compared to other U.S. areas I believe) e85 is 2.85 a gallon and regular is about 3.75...
jctevere is offline  
Old 03-26-2011, 08:52 PM
  #57  
Super Member
 
itsLoonie's Avatar
 
Join Date: Nov 2008
Location: CALIFORNIA
Posts: 734
Likes: 0
Liked 1 Time in 1 Post
2012 E350 RWD
That is ****in cheap! Here in Cali (San Jose to be exact) E85 is 3.39 per gal. 87 is around 4.05 and 91 (our cars) is 4.20+ at Chevrons.
itsLoonie is offline  
Old 03-26-2011, 08:54 PM
  #58  
MBWorld Fanatic!
 
jctevere's Avatar
 
Join Date: Sep 2009
Location: Dix Hills, New York
Posts: 2,108
Likes: 0
Liked 2 Times in 2 Posts
2012 C250 Coupe
Well, it was at a sunergy place (never really heard of them) but its the only station I have found on Long Island that carries E85... The prices here greatly vary. The average price is 3.75 for regular, 4.00 for premium 93 from the popular chains. But then you will find those crazy shell stations that are charging 4.00 for regular and near 4.35 for premium!

I have managed to find a Sunoco station near work that is 3.85 for premium 93 octane, and same price for credit!
jctevere is offline  
Old 12-30-2012, 04:57 PM
  #59  
Newbie
 
Join Date: Dec 2012
Posts: 4
Likes: 0
Liked 0 Times in 0 Posts
C300
I've been filling my 2009 C300 up with 87 for the past 10000 miles (mostly highway). Can easily get a mileage of 28 on the highway. Noticed no knocking or performance issues. Never tried E85 though - am curious about it.
tantrix is offline  
Old 12-30-2012, 06:03 PM
  #60  
Senior Member
 
Join Date: Mar 2012
Location: Lancaster, PA
Posts: 455
Likes: 0
Liked 1 Time in 1 Post
2010 E350
Never less than 93 octane for me. 87 made my car knock and ping when I first drove it off the dealer lot, they put crappy 87 in it and said it was fine but the inside of the filler door says no less than 91
Cleanbenz is offline  
Old 12-31-2012, 12:56 AM
  #61  
Senior Member
 
Join Date: Oct 2011
Location: NOVA
Posts: 252
Likes: 0
Liked 0 Times in 0 Posts
c300 4matic
Originally Posted by Cleanbenz View Post
Never less than 93 octane for me. 87 made my car knock and ping when I first drove it off the dealer lot, they put crappy 87 in it and said it was fine but the inside of the filler door says no less than 91
+1 I used 87 a few times and my car ping. switched to 93 and thats what I've been using ever since.
C300BLK is offline  
Old 02-21-2013, 08:32 AM
  #62  
Newbie
 
Join Date: Jul 2011
Posts: 11
Likes: 0
Liked 0 Times in 0 Posts
2010 C-300
Originally Posted by tantrix View Post
I've been filling my 2009 C300 up with 87 for the past 10000 miles (mostly highway). Can easily get a mileage of 28 on the highway. Noticed no knocking or performance issues. Never tried E85 though - am curious about it.
Your fuel mileage will go down significantly with E85. You realize that the 85 in E85 is not the octane rating, but it's the percent ethanol right? It has much lower BTU's and therefore a less efficient burn and thus lower fuel economy...the Octane of E85 is alot higher, but because of the lower economy, it has to be quite a bit cheaper than Premium gas to be a sensible purchase.
PROPHET is offline  
Old 02-21-2013, 02:43 PM
  #63  
Member
 
Join Date: Dec 2012
Posts: 108
Likes: 0
Liked 0 Times in 0 Posts
2008 C350
Can you use the E89 then only two short of the recommeneded on the fuel cap
livestrong191 is offline  
Old 02-22-2013, 10:00 AM
  #64  
Newbie
 
Join Date: Nov 2012
Posts: 5
Likes: 0
Liked 0 Times in 0 Posts
2010 C300
Originally Posted by BMW215 View Post
When I bought the car last week, the dealer told me that mid-grade fuel was fine. He said that once a month, fill the tank with 91-92 octane.
A perfect example of how car salesman know little to nothing about cars in general. 'once a month' is going to do nothing for your car, MB tunes the motors so that they require a little higher octane - that is how they get better performance numbers out of their motors. It isn't because it is a "premium car" and premium fuel has nothing to do with longevity of your engine or how clean it burns or anything else of that nature. It is purely the way the motor was tuned, likely unnecessarily considering these engines aren't high compression as far as I know lol.
KBT2012 is offline  
Old 12-28-2014, 08:40 PM
  #65  
Junior Member
 
Join Date: Nov 2014
Posts: 66
Likes: 0
Liked 0 Times in 0 Posts
2011 c300 sport
Educational thread.

Any comments on the occasional use of octane boost?

It's difficult to find 93 octane in Maine.
PeterHyatt is offline  
Old 03-20-2015, 12:49 PM
  #66  
Newbie
 
Join Date: Jan 2015
Posts: 4
Likes: 0
Liked 0 Times in 0 Posts
2011 C300
Originally Posted by jctevere View Post
That's EXPENSIVE... Here on Long Island (where gas is relatively expensive compared to other U.S. areas I believe) e85 is 2.85 a gallon and regular is about 3.75...
Around 3.60 a gallon for 91 in California
Jonathan650 is offline  
Old 06-22-2015, 11:12 AM
  #67  
Newbie
 
Join Date: Jun 2015
Posts: 10
Likes: 0
Liked 0 Times in 0 Posts
c300
Hi,

Purchased 2013 c 300 a week back.

My dealer told me to use 85 normal gas. he said new engines are designed to handle the normal gas.

Is it true ?


On the inside of my gas filler door, it tells me that I can use E85 in this car..
gurubhai is offline  
Old 06-22-2015, 11:42 AM
  #68  
MBWorld Fanatic!
 
jctevere's Avatar
 
Join Date: Sep 2009
Location: Dix Hills, New York
Posts: 2,108
Likes: 0
Liked 2 Times in 2 Posts
2012 C250 Coupe
Originally Posted by gurubhai View Post
Hi,

Purchased 2013 c 300 a week back.

My dealer told me to use 85 normal gas. he said new engines are designed to handle the normal gas.

Is it true ?


On the inside of my gas filler door, it tells me that I can use E85 in this car..
I believe only non 4matic w204s in certain years can handle E85 gas blends (which is NOT normal gas). It means 85% ethanol and 15% regular gas. It is considerably cheaper than regular 87 octane gas (which is 10% or less ethanol and 87 percent isooctane).

Typically on E85 you may receive less fuel economy, but the lower cost usually outweighs the cons of fuel economy resulting in net savings. Fuel systems and lines need to be designed to support E85 and should only be used in cars that specify they can support it on the fuel door (which you said your door states it can).

As far as regular gas goes, Mercedes engines are designed for premium 91 octane minimum (most premium gas at stations is 93 octane). However, the engines have knock sensors which can detect premature detonation (due to lower octane) and Adjust timing, etc to prevent engine knock or damage to the engine. I would recommend sticking with 93 octane regular gas for best performance and fuel economy, but you should definitely try out e85 if your car can support it and see how you like it.

It's not recommended to mix the two, so that is a disadvantage for e85 gas as not many stations (at least in northeast region) carry it. You should try to let your fuel tank run as low as possible before switching from e85 to regular pump gas (and vice versa).

Hope this helps.

Last edited by jctevere; 06-22-2015 at 11:45 AM.
jctevere is offline  
Old 06-22-2015, 12:52 PM
  #69  
Newbie
 
Join Date: Jan 2015
Posts: 4
Likes: 0
Liked 0 Times in 0 Posts
2011 C300
Originally Posted by gurubhai View Post
Hi,

Purchased 2013 c 300 a week back.

My dealer told me to use 85 normal gas. he said new engines are designed to handle the normal gas.

Is it true ?


On the inside of my gas filler door, it tells me that I can use E85 in this car..

I always use premium gas. 91 where I live!
Jonathan650 is offline  
Old 06-22-2015, 01:48 PM
  #70  
Newbie
 
Join Date: Jun 2015
Posts: 10
Likes: 0
Liked 0 Times in 0 Posts
c300
Originally Posted by jctevere View Post
I believe only non 4matic w204s in certain years can handle E85 gas blends (which is NOT normal gas). It means 85% ethanol and 15% regular gas. It is considerably cheaper than regular 87 octane gas (which is 10% or less ethanol and 87 percent isooctane).

Typically on E85 you may receive less fuel economy, but the lower cost usually outweighs the cons of fuel economy resulting in net savings. Fuel systems and lines need to be designed to support E85 and should only be used in cars that specify they can support it on the fuel door (which you said your door states it can).

As far as regular gas goes, Mercedes engines are designed for premium 91 octane minimum (most premium gas at stations is 93 octane). However, the engines have knock sensors which can detect premature detonation (due to lower octane) and Adjust timing, etc to prevent engine knock or damage to the engine. I would recommend sticking with 93 octane regular gas for best performance and fuel economy, but you should definitely try out e85 if your car can support it and see how you like it.

It's not recommended to mix the two, so that is a disadvantage for e85 gas as not many stations (at least in northeast region) carry it. You should try to let your fuel tank run as low as possible before switching from e85 to regular pump gas (and vice versa).

Hope this helps.


Thank you.
gurubhai is offline  
Old 06-22-2015, 05:46 PM
  #71  
Member
 
babyboxer1's Avatar
 
Join Date: Jan 2013
Posts: 128
Likes: 0
Liked 0 Times in 0 Posts
2013 c350 Coupe
Watching all the US posts on gas prices, all I can say is damn - 91 octane is about $1.49 CND a liter where I live, which is around $7.40 USD a gallon.
babyboxer1 is offline  
Old 06-22-2015, 06:57 PM
  #72  
Senior Member
 
Skyline45's Avatar
 
Join Date: May 2014
Posts: 272
Liked 0 Times in 0 Posts
2014 E350 4matic Luxury and a 1987 560SL
Originally Posted by mbx84 View Post
I use 91 from cheveron,thinking move down to 89?any advise?thanks in advance
Move down!? Bro if anything you need to move up. You bought a High Compression motor, treat it like such...
Skyline45 is offline  
Old 06-22-2015, 11:10 PM
  #73  
Member
 
babyboxer1's Avatar
 
Join Date: Jan 2013
Posts: 128
Likes: 0
Liked 0 Times in 0 Posts
2013 c350 Coupe
Originally Posted by Skyline45 View Post
Move down!? Bro if anything you need to move up. You bought a High Compression motor, treat it like such...
Agreed - we knew what we got ourselves into when purchasing these vehicles. You could debate the wording if they said "recommended" 91, but if I recall correctly, when I open my gas door it says MIN 91. The $2-$4 savings is negligible on the spot, but the risk of incurring a few hundred or thousand dollars in repairs is not worth it. We purchased these cars for their looks, their features and certainly their performance - fuel them up properly!
babyboxer1 is offline  
Old 06-22-2015, 11:52 PM
  #74  
Member
 
LogicalApex's Avatar
 
Join Date: Oct 2014
Location: Pennsylvania, USA
Posts: 144
Liked 6 Times in 6 Posts
2014 C300 Luxury
Originally Posted by jctevere View Post
I believe only non 4matic w204s in certain years can handle E85 gas blends (which is NOT normal gas). It means 85% ethanol and 15% regular gas. It is considerably cheaper than regular 87 octane gas (which is 10% or less ethanol and 87 percent isooctane).

Typically on E85 you may receive less fuel economy, but the lower cost usually outweighs the cons of fuel economy resulting in net savings. Fuel systems and lines need to be designed to support E85 and should only be used in cars that specify they can support it on the fuel door (which you said your door states it can).

As far as regular gas goes, Mercedes engines are designed for premium 91 octane minimum (most premium gas at stations is 93 octane). However, the engines have knock sensors which can detect premature detonation (due to lower octane) and Adjust timing, etc to prevent engine knock or damage to the engine. I would recommend sticking with 93 octane regular gas for best performance and fuel economy, but you should definitely try out e85 if your car can support it and see how you like it.

It's not recommended to mix the two, so that is a disadvantage for e85 gas as not many stations (at least in northeast region) carry it. You should try to let your fuel tank run as low as possible before switching from e85 to regular pump gas (and vice versa).

Hope this helps.
My 2014 C300 can handle E85 fuel and is a Flex Fuel vehicle. Not all C300s are Flex Fuel, but some are. You can tell by looking at the fuel filler cap. It mentions it. You'll also see it on the VIN Decoder site as well.

That being said, you are not correct on the mixing. The car is designed to run on pure E85, 91+ Octane, or any combination of the two.

I haven't yet used E85 as the price is higher than 93 Octane here and it is less powerful... But if you have a Flex Fuel W204 you can use it in any combination you want. According to Mercedes...
LogicalApex is offline  
 

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 

Thread Tools
Search this Thread
Rate This Thread
Rate This Thread:

Quick Reply: what grade gas do you guys use for C300?


Contact Us - About Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: