Liqui Moly Jectron/Top Tier Fuel
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Member
Joined: Apr 2025
Posts: 96
Likes: 50
From: Boston area, MA
2021 S580
Liqui Moly Jectron/Top Tier Fuel
Just curious if anyone uses or has used Liqui Moly Jectron--or any other fuel injector/treatment/fuel type additive and what you think about it. I bought a 6-pack of the Liqui Moly Jectron on sale ($7/bottle) and it seems to have made a difference after just the first treatment. I added one bottle and then filled the tank to about 3/4...and did some "spirited driving" when possible, running the tank down pretty low. Seems like the engine is running a bit smoother, getting 10% better fuel economy, even smoother acceleration. Of course, I tend to have a vivid imagination, so maybe some of you guys can share your experience and set me straight if needed. 
NOTE: I do NOT use top-tier fuel...I get the 93 octane of course, but my local Gulf gas station is about $1/gallon cheaper than the crooks that sell top-tier fuel. So, if anyone has opinions on that as well, please chime in!
P.S. My car was up on a lift the other day and I took a look inside the exhaust pipes...wow, were they clean. I ran my finger around the inside of the pipes and came up with nothing. They're bright and shiny.
NOTE: I do NOT use top-tier fuel...I get the 93 octane of course, but my local Gulf gas station is about $1/gallon cheaper than the crooks that sell top-tier fuel. So, if anyone has opinions on that as well, please chime in!
P.S. My car was up on a lift the other day and I took a look inside the exhaust pipes...wow, were they clean. I ran my finger around the inside of the pipes and came up with nothing. They're bright and shiny.
Senior Member
Joined: Jan 2023
Posts: 290
Likes: 85
W167 2021 GLE63S, W223 2022 S580
COSTCO
Just curious if anyone uses or has used Liqui Moly Jectron--or any other fuel injector/treatment/fuel type additive and what you think about it. I bought a 6-pack of the Liqui Moly Jectron on sale ($7/bottle) and it seems to have made a difference after just the first treatment. I added one bottle and then filled the tank to about 3/4...and did some "spirited driving" when possible, running the tank down pretty low. Seems like the engine is running a bit smoother, getting 10% better fuel economy, even smoother acceleration. Of course, I tend to have a vivid imagination, so maybe some of you guys can share your experience and set me straight if needed.
NOTE: I do NOT use top-tier fuel...I get the 93 octane of course, but my local Gulf gas station is about $1/gallon cheaper than the crooks that sell top-tier fuel. So, if anyone has opinions on that as well, please chime in!
P.S. My car was up on a lift the other day and I took a look inside the exhaust pipes...wow, were they clean. I ran my finger around the inside of the pipes and came up with nothing. They're bright and shiny.
NOTE: I do NOT use top-tier fuel...I get the 93 octane of course, but my local Gulf gas station is about $1/gallon cheaper than the crooks that sell top-tier fuel. So, if anyone has opinions on that as well, please chime in!
P.S. My car was up on a lift the other day and I took a look inside the exhaust pipes...wow, were they clean. I ran my finger around the inside of the pipes and came up with nothing. They're bright and shiny.
MBWorld Fanatic!
Joined: Jun 2021
Posts: 3,115
Likes: 1,349
From: Fleriduh
W212 E63S Wagon - GSL580 - E63 - E350 - C300
It was suggested to me to put in a Techron and two Seafoams...I did notice that my wallet was lighter. No other effects...maybe the LiquiMoly has a better recipie. Or, could be the "tune up" of the spirited driving?
Super Member
Joined: Feb 2020
Posts: 715
Likes: 380
From: Atlanta, Georgia, USA
2023 S580
I only burn Costco fuel in my car as it sounds like @Sparky66 may as well. They are considerably cheaper than competitors and their fuel is top-notch. If you have a Costco in your city and it isn't too inconvenient to drive there to fill up, then I'd suggest you give it a shot and see how it compares to the Moly additive.
I was going to suggest Sam's club as an alternative, but this website states that Sam's gas is not Top Tier Who has better gas between Costco and Sam's Club?
Here's a link stating that Costco gas is as good as Exxon, Shell and others.
Is Costco Gas Quality the Same as Exxon, Shell and Chevron? - SavingAdvice.com Blog
A number of automakers made the decision that the U.S. government additive requirement wasn’t high enough for many cars. As a result, they developed a “Top Tier” standard. In order to meet the “Top Tier” designation, the fuel sold at the gas station must meet additive requirements higher than required by the U.S. government, here. Costco fuel meets this top-tier standard.
I was going to suggest Sam's club as an alternative, but this website states that Sam's gas is not Top Tier Who has better gas between Costco and Sam's Club?
Here's a link stating that Costco gas is as good as Exxon, Shell and others.
Is Costco Gas Quality the Same as Exxon, Shell and Chevron? - SavingAdvice.com Blog
Is Costco Gas As Good As the Competitors?
So, Costco meets the minimum requirements set by the EPA, but it also meets more stringent components set by the automaking industry.A number of automakers made the decision that the U.S. government additive requirement wasn’t high enough for many cars. As a result, they developed a “Top Tier” standard. In order to meet the “Top Tier” designation, the fuel sold at the gas station must meet additive requirements higher than required by the U.S. government, here. Costco fuel meets this top-tier standard.
MBWorld God!
Joined: Dec 2019
Posts: 32,336
Likes: 6,315
I only burn Costco fuel in my car as it sounds like @Sparky66 may as well. They are considerably cheaper than competitors and their fuel is top-notch. If you have a Costco in your city and it isn't too inconvenient to drive there to fill up, then I'd suggest you give it a shot and see how it compares to the Moly additive.
I was going to suggest Sam's club as an alternative, but this website states that Sam's gas is not Top Tier Who has better gas between Costco and Sam's Club?
Here's a link stating that Costco gas is as good as Exxon, Shell and others.
Is Costco Gas Quality the Same as Exxon, Shell and Chevron? - SavingAdvice.com Blog
A number of automakers made the decision that the U.S. government additive requirement wasn’t high enough for many cars. As a result, they developed a “Top Tier” standard. In order to meet the “Top Tier” designation, the fuel sold at the gas station must meet additive requirements higher than required by the U.S. government, here. Costco fuel meets this top-tier standard.
I was going to suggest Sam's club as an alternative, but this website states that Sam's gas is not Top Tier Who has better gas between Costco and Sam's Club?
Here's a link stating that Costco gas is as good as Exxon, Shell and others.
Is Costco Gas Quality the Same as Exxon, Shell and Chevron? - SavingAdvice.com Blog
Is Costco Gas As Good As the Competitors?
So, Costco meets the minimum requirements set by the EPA, but it also meets more stringent components set by the automaking industry.A number of automakers made the decision that the U.S. government additive requirement wasn’t high enough for many cars. As a result, they developed a “Top Tier” standard. In order to meet the “Top Tier” designation, the fuel sold at the gas station must meet additive requirements higher than required by the U.S. government, here. Costco fuel meets this top-tier standard.
Just keep in mind even costco uses different refineries depending on where the forum member reside, some are worse than others, this dependency might have to do with which state as well.
not entirely sure why OP doesn't want to use top tier (unless 93 isn't offered in top tier anywhere) since top tier has the additives MB prefers and that MB recommends.
Junior Member
Joined: Jan 2025
Posts: 39
Likes: 17
2024 S580
I did some math some time ago and for the number of miles I drive the cost of membership exceeded the savings at the pump. Currently in my area Walmart is .10 cheaper for premium than both Costco and Sam's Club and no membership needed. I have no idea if the gas at Walmart is top tier. I would doubt it.
MBWorld Fanatic!
Joined: Jun 2021
Posts: 3,115
Likes: 1,349
From: Fleriduh
W212 E63S Wagon - GSL580 - E63 - E350 - C300
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