Is gas additive safe for mb vehicles?
Thread Starter
Newbie
Joined: Jan 2018
Posts: 5
Likes: 0
Mercedes Benz C300 Luxury
Is gas additive safe for mb vehicles?
It was suggested that I use RXP. I have never used a product like this. Only premium gas to help keep things clean. This wouldn't hurt... Would it?
Last edited by Jenncloud9; Jan 31, 2018 at 11:12 PM.
Super Member
Joined: Mar 2011
Posts: 803
Likes: 37
From: Bay Area, CA
2011 C300 Sport, P1, MM, Wood, Heated FS, DIY rearview camera.
I know nothing about RXP and have only used Techron a few time in all my four cars, just because Costco often sells Techron at a reduced price. None of the cars shows any difference before and after the additive added in.
From my owner's manual, "... do not use fuel additives that are not tested and approved for Mercedes-Benz vehicles. Damage or malfunctions can result that are not covered by ... Warranty."
From my owner's manual, "... do not use fuel additives that are not tested and approved for Mercedes-Benz vehicles. Damage or malfunctions can result that are not covered by ... Warranty."
MBWorld Fanatic!
Joined: Sep 2014
Posts: 1,051
Likes: 216
From: LaLaLand
2015 GLK350 & 2020 C300
I am not believer in adding fuel additives. Common petrol fuel already has additives in the US market, you might have heard of ethanol at a certain percentage.
And most of the fuel you fill up at common fuel stations have very very very very small contamination, but your car really won't notice it unless it is the wrong fuel or too much water.
And most of the fuel you fill up at common fuel stations have very very very very small contamination, but your car really won't notice it unless it is the wrong fuel or too much water.
Super Member
Joined: Mar 2011
Posts: 803
Likes: 37
From: Bay Area, CA
2011 C300 Sport, P1, MM, Wood, Heated FS, DIY rearview camera.
I fill in Costco gas 99% of the time. It's lower priced and it has more cleaning agent than some other brands, according to Costco statement.
Senior Member
Joined: Jan 2009
Posts: 290
Likes: 22
From: Weaverville, Ca
1992 MB 190E, 2016 MB C300
IMO, It's not needed unless you use cheap gas. It doesn't hurt to use on occasion. Techron, Red line, or Liqui Moly are prefered brands. I use once every 6 months or so for added protection of possible injector problems.
Trending Topics
MB World Stories
The Best of Mercedes & AMG
Manual Mercedes? 6 Times Sindelfingen Let Drivers Have All The Fun
Verdad Gallardo
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Verdad Gallardo
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
Super Member
Joined: Dec 2015
Posts: 812
Likes: 86
From: Springboro, OH
16 GLC 19 Volvo XC40 06Corvette Z06
If one is concerned about the quality of the gas your pumping into your car, switch to Top Tier gas.
Additionally, the Operator's Manual admonishes one not to introduce such additive into your fuel unless approved by M-B.
Additionally, the Operator's Manual admonishes one not to introduce such additive into your fuel unless approved by M-B.
Last edited by larrypmyers; Feb 1, 2018 at 05:48 PM.
MBWorld Fanatic!
Joined: Oct 2004
Posts: 1,358
Likes: 297
From: South Florida
2010 E63 AMG, 2003 E500
Super Member
Joined: Oct 2014
Posts: 517
Likes: 22
From: California
Mercedes C250 Coupe
I'd be inclined to agree with the SK/FL input above....................
............ been using Chevron Supreme/Techron since this beautiful little coupe stole my heart..........................
......but not my wallet - - CPO/MBFS sealed the DEAL.....(two comp payments.+ two comp 10k services!)
all I worry about is that damn Takata recall (plus the battery is close to age 6.5)
ez
............ been using Chevron Supreme/Techron since this beautiful little coupe stole my heart..........................
......but not my wallet - - CPO/MBFS sealed the DEAL.....(two comp payments.+ two comp 10k services!)
all I worry about is that damn Takata recall (plus the battery is close to age 6.5)
ez
Super Member
Joined: Nov 2016
Posts: 680
Likes: 152
2008 C350 Sport 4Matic Swap
250k here and I use lucas fuel additive every few fill ups, when i first started using it at around 160k it was to fix an engine ping i was hearing from time to time and I have never heard it again after using Lucas. I also ran some seafoam threw the intake at 180k and again at 220k which seemed to help a lot. Also the PCV systems on these cars tend to get a lot of oil in the intake, specially from the passenger head. I put a catch can on that side and seafoamed it now my intake looks like new inside. After 50k there is no sign of oil in the intake and the catch can is doing a great job catching it, point is, without oil in the intake side of the engine, carbon wont be able to stick as well and you're engine will run better for longer, 250k and compression is still very strong and runs like new without burning or leaking a drop of oil.
Super Member
Joined: Mar 2011
Posts: 803
Likes: 37
From: Bay Area, CA
2011 C300 Sport, P1, MM, Wood, Heated FS, DIY rearview camera.
I heard from my colleague that lower Octane gas has more power? I don't bother going into that details. In the first 4-5 years I always used premium gas (91). Now I use regular (87) 90% times. No difference at all that I can tell.
Super Member
Joined: Nov 2016
Posts: 680
Likes: 152
2008 C350 Sport 4Matic Swap
Maybe you dont feel it but you're engine sure does, you're getting plenty of knock with 87 octane which is very bad for the long term life of you're engine, stick to 91 octane or greater, these engine ping and knock if you dont, maybe you dont realize it or hear it but I guaranty your engine pings and knocks.
Super Member
Joined: Mar 2011
Posts: 803
Likes: 37
From: Bay Area, CA
2011 C300 Sport, P1, MM, Wood, Heated FS, DIY rearview camera.
So nobody can hear engine pinging and knocking? What does knock sensor do? It adjusts the timing but goes out of its adjustable range?
Super Member
Joined: Nov 2016
Posts: 680
Likes: 152
2008 C350 Sport 4Matic Swap
Last edited by W204Motorsports; Feb 3, 2018 at 01:27 PM.
Super Member
Joined: Mar 2011
Posts: 803
Likes: 37
From: Bay Area, CA
2011 C300 Sport, P1, MM, Wood, Heated FS, DIY rearview camera.
Oh thank you for the video info. I don't have time to watch the entire video but you convinced me. I will probably buy that tool and start putting in 91 only. One time I saw an article saying for most cars (not truly sports cars), using premium is just a waste of money.
Junior Member
Joined: Aug 2016
Posts: 57
Likes: 4
2013 Mercedes C250 Coupe
I use Gumout "All in one". Your injectors WILL get a little dirty over time no matter what gas you use, and it's of good practice to use a cleaner/solvent every once in a while to help. This is why the dealerships offer injector cleaning service. The only cleaner I've used that has made a noticeable difference for me has been the Gumout. I've used Techron, Seafoam, & many others. Used Gumout in my '10 BMW 328i. I thought the car ran perfectly, No pinging and mileage was spot on, but out of habit I added the gumout, and it made a noticeable difference. Throttle response got better and the car got a little peppier. I have also seen tests by regular folks with gumout, with a camera in the combustion chamber, you could see the carbon on the top of the piston. It did clean up the carbon deposits on pistons, so it does work. And 91 octane is a must!
Last edited by bigrob126; Feb 3, 2018 at 06:30 PM.
MBWorld Fanatic!
Joined: Jun 2011
Posts: 2,366
Likes: 251
From: Canada
A car
I use Gumout "All in one". Your injectors WILL get a little dirty over time no matter what gas you use, and it's of good practice to use a cleaner/solvent every once in a while to help. This is why the dealerships offer injector cleaning service. The only cleaner I've used that has made a noticeable difference for me has been the Gumout. I've used Techron, Seafoam, & many others. Used Gumout in my '10 BMW 328i. I thought the car ran perfectly, No pinging and mileage was spot on, but out of habit I added the gumout, and it made a noticeable difference. Throttle response got better and the car got a little peppier. I have also seen tests by regular folks with gumout, with a camera in the combustion chamber, you could see the carbon on the top of the piston. It did clean up the carbon deposits on pistons, so it does work. And 91 octane is a must!
Anyways, it is minor, and IIRC on the instructions of those cleaners they do tell you to do an oil change afterwards, or shortly
Junior Member
Joined: Aug 2016
Posts: 57
Likes: 4
2013 Mercedes C250 Coupe
n'
Excellent point! It's bad enough that fuel gets by the rings and into the oil, it seems more so on turbo cars I've noticed, which can compromise the oil's integrity, but the solvent/cleaner added to a tank of fuel will undoubtedly get into your oil as well adding to the breakdown of the oil. It is most definitely a good idea to probably add your fuel additive at your last fill up right before an oil change. I try to do this, but must admit I haven't always been so on it!
Gumout makes great products, BUT it is worth noting, that after a tank or two of gas after you've run something like gumout, change your oil. PEA is the main detergent in that, and even moreso in the Redline SI1 fuel system cleaner. Great at removing carbon, but because of its very low volatility and high effectiveness, it tends to end up contaminating oil and thus breaking down some of the oil's strength (flashpoint drops etc).
Anyways, it is minor, and IIRC on the instructions of those cleaners they do tell you to do an oil change afterwards, or shortly
Anyways, it is minor, and IIRC on the instructions of those cleaners they do tell you to do an oil change afterwards, or shortly
Senior Member
Joined: Feb 2014
Posts: 308
Likes: 20
benzw205
I am not believer in adding fuel additives. Common petrol fuel already has additives in the US market, you might have heard of ethanol at a certain percentage.
And most of the fuel you fill up at common fuel stations have very very very very small contamination, but your car really won't notice it unless it is the wrong fuel or too much water.
And most of the fuel you fill up at common fuel stations have very very very very small contamination, but your car really won't notice it unless it is the wrong fuel or too much water.
I agree, but wondering if it is what most people think ?
Is it possible to find a comparative video of cars having used additives for years and cars not using it ?
It seems like marketing BS to me, but I might be wrong ?
Super Member
Joined: Oct 2014
Posts: 517
Likes: 22
From: California
Mercedes C250 Coupe
[QUOTE=Bahnstormer;7371782]+1. This is good advice.[/QUOTE
A Chevron Supreme (w/Techron) diet has been fed to our C250 coupe for 7 years. No issues there. (We did have an ESL issue at 39,000 miles - extended warranty helped with the one-grand tab).
ez
A Chevron Supreme (w/Techron) diet has been fed to our C250 coupe for 7 years. No issues there. (We did have an ESL issue at 39,000 miles - extended warranty helped with the one-grand tab).
ez
