Mercedes GLE Forum banner

1 - 20 of 20 Posts

·
Registered
Joined
·
30 Posts
Discussion Starter · #1 ·
I figured this topic would get people talking:

Do you put premium fuel in your GLE as instructed? I don’t. I mentioned this to a coworker the other day and she nearly had a heart attack. She told her boyfriend (who also drives a Benz) what I said and he almost had a heart attack too. She put me in touch with him and he launched into a dissertation pointedly telling me that what I was doing was akin to blaspheme. I told him the GLE (and virtually all cars) runs fine on regular fuel and premium is not necessary. He strongly disagreed and told me he would NEVER fill his tank with regular fuel. I told him that is his choice but I felt otherwise.

He said I would damage the engine! Potentially void the warranty! And perhaps disrupt the space-time continuum by using regular fuel! I let him have his say and then I pointed out that the kind of driving I do does not require premium fuel. I drive to work, to home, to the gym, etc. I am not a race car driver, I do not drag race, and I do not need to extract the absolute maximum performance from my car. If I did, maybe I would buy premium fuel . . . but I would also have premium brakes installed and premium racing tires as well. I don’t have those because that is not the kind of driving I do. I have had this debate with a number of car guys over the years. Some swear higher end cars MUST have premium fuel. I do not believe they do. Two cars ago I had a BMW; premium fuel was required, but I never bought it. My last car was an Audi; again premium fuel was required but I always filled it with regular. Both cars ran fine for all the years I owned them. In fact, I still feel guilty for letting go of the Audi because it ran perfectly at 73,000 miles when I decided to get something new.

My argument is this: gasoline is basically the same product. It has to be otherwise it would not work in all the many different engines we use it for: different makes and models of cars from manufacturers all over the world, go carts, lawn mowers, portable generators, boats, etc, from many different manufacturers. And remember, all of these products can use gas from FL, to ME, to WA, to CA. Gasoline purchased from all over the country will work in any gas powered engine because (say it with me): it is the same product. If there were big differences in gasoline different gas could not work in all these different products from so many different manufacturers.

I’m not saying there is zero different between gasoline grades. I am merely saying that the difference is not sufficient enough to warrant buying premium gas for any newer car. There ARE cars from the 60s and 70s where you can hear and feel a noticeable difference in the engine between premium and regular fuel but that difference is negligible in modern cars.

I know many of you will think I am crazy or foolish for buying regular gas, but ask yourself this. What seems more likely 1) your car literally needs premium full to function properly or 2) the “idea” of premium fuel is a con perpetrated by car makers and big oil to extract more money from gullible consumers.

I explained all this to a friend of mine who once swore by premium gasoline. I told him to do an experiment: turn off the radio and really listen to your car when you drive it… its engine… performance… handling… with premium fuel. Then for your next two fill ups use regular. And again, really pay attention to the car. If you really notice a difference that is important to you then stick with premium. If not, forget it and go to regular. He did this test and he never buys premium any more! Mind you this is a bud who used to SWEAR on the value of premium gasoline. I have not seen him in a couple years but we stay in touch via text. The other day I sent him a selfie of me filling up my car with regular at a gas station. We still laugh about it. He said I made a believer out of him and he has not wasted money on premium fuel in years.
 

·
Registered
Joined
·
30 Posts
Discussion Starter · #2 ·
Are you familiar with the Smart fortwo subcompact car? It is a two seater and not a performance car by any measure... yet it "requires" premium fuel! Why would this car--that is essentially a glorified go cart require premium fuel?
 

·
Registered
Joined
·
158 Posts
While some cars require premium gas, many others simply carry a recommendation to use it. But the Mercedes GLE owner's manual says premium fuel of 91 AKI/95 RON is a must...A bit conflicted now that you've brought this up.
 

·
Registered
Joined
·
23 Posts
Your engine is equipped with a knock sensor designed to detect pre-ignition (detonation, combustion knock, ping) and send information to the Powertrain Control Module (PCM) which is designed to correct for the problem by adjusting the ignition timing and fuel consumption to prevent the engine from being destroyed. Interestingly, less octane is required when driving at high altitudes as there is less oxygen in the air. From calculations I've done in the past there is no savings going to regular because the spread in prices is not so great as to make up for the increased use of fuel to compensate for decreased engine performance.
 

·
Registered
Joined
·
242 Posts
Anyone living in the City shouldn't worry too much about the type of gas because they have options to get around and that's what I seen the GLE demographic being. But even the broader GLE demographic shouldn't worry, if you have to worry about gas with the GLE... maybe it isn't for you.
 

·
Registered
Joined
·
30 Posts
Discussion Starter · #6 ·
While some cars require premium gas, many others simply carry a recommendation to use it. But the Mercedes GLE owner's manual says premium fuel of 91 AKI/95 RON is a must...A bit conflicted now that you've brought this up.
“Required” or what? The car won’t run? The engine will be damaged? The warranty will be voided? I’ll cause a black hole? As I said previously, I have had this debate with a few car guys over the years. Back when I had my BMW one of my interlocutors swore I was doing irreparable damage to my car’s engine by not filling it with premium fuel. He threw a bunch of technical information at me about the car’s engine to justify premium gasoline. I freely admit that I am not an engineer and I did not have the background to challenge his technical arguments tit for tat. But I do have experience and common sense. No one is going to convince me that I “damaged” the engine of a vehicle that I owned two cars ago because I didn’t use premium fuel. I drove that car for years without incident and in those days I did occasionally “drag race” and otherwise test the limits of the car’s engine. I once drove it at 132mph going from San Francisco to Los Angeles--all on regular fuel.

My Audi ran fine on regular fuel… and so does my GLE 43 AMG. Yes, my AMG runs on regular fuel—not premium! Maybe Karl Benz is rolling over in his grave, but I will never fill this car with premium fuel.
 

·
Registered
Joined
·
30 Posts
Discussion Starter · #7 ·
While some cars require premium gas, many others simply carry a recommendation to use it. But the Mercedes GLE owner's manual says premium fuel of 91 AKI/95 RON is a must...A bit conflicted now that you've brought this up.
“Required” or what? The car won’t run? The engine will be damaged? The warranty will be voided? I’ll cause a black hole? As I said previously, I have had this debate with a few car guys over the years. Back when I had my BMW one of my interlocutors swore I was doing irreparable damage to my car’s engine by not filling it with premium fuel. He threw a bunch of technical information at me about the car’s engine to justify premium gasoline. I freely admit that I am not an engineer and I did not have the background to challenge his technical arguments tit for tat. But I do have experience and common sense. No one is going to convince me that I “damaged” the engine of a vehicle that I owned two cars ago because I didn’t use premium fuel. I drove that car for years without incident and in those days I did occasionally “drag race” and otherwise test the limits of the car’s engine. I once drove it at 132mph going from San Francisco to Los Angeles--all on regular fuel.

My Audi ran fine on regular fuel… and so does my GLE 43 AMG. Yes, my AMG runs on regular fuel—not premium! Maybe Karl Benz is rolling over in his grave, but I will never fill this car with premium fuel.

What precisely are you conflicted about?
 

·
Registered
Joined
·
158 Posts
I've always assumed that engines were designed to run on a certain level of octane, and won't consistently putting regular fuel, when the owner's manual says otherwise, nullify your warranty?
 

·
Registered
Joined
·
3 Posts
I've never used premium fuel not because of cost but because its the same thing I totally agree with you and I've never had Merc pull me up for it and I've been driving there cars for 20 years all models shapes and sizes and they have all been serviced fully by Mercedes so they might recommend it but there not checking your doing it I pick up me new Gle tomorrow I'll ask the tech so I can look at his bewildered Eh! face
;)
 

·
Registered
Joined
·
30 Posts
Discussion Starter · #11 ·
I've always assumed that engines were designed to run on a certain level of octane, and won't consistently putting regular fuel, when the owner's manual says otherwise, nullify your warranty?
Why did you assume that? And what do you make of my experience driving the BMW, Audi, and now GLE on regular fuel?
 

·
Registered
Joined
·
30 Posts
Discussion Starter · #12 ·
I've never used premium fuel not because of cost but because its the same thing I totally agree with you and I've never had Merc pull me up for it and I've been driving there cars for 20 years all models shapes and sizes and they have all been serviced fully by Mercedes so they might recommend it but there not checking your doing it I pick up me new Gle tomorrow I'll ask the tech so I can look at his bewildered Eh! face
;)
Did you pick up your new GLE? What color? What engine did you go for... 350? 400? 43? 63?
 

·
Registered
Joined
·
2 Posts
According to the GLE Owner's Manual:

"As a temporary measure, if the recommended
fuel is not available, you may also use regular
unleaded gasoline with an octane rating of
87 AKI/91 RON. This may reduce engine performance
and increase fuel consumption. Avoid
driving at full throttle and sudden acceleration."

So it seems you are OK as long as you avoid driving at full throttle and accelerating suddenly.

I guess the open question is whether you actually save money -- does the possible reduced fuel economy offset the price difference.
 

·
Registered
Joined
·
242 Posts
According to the GLE Owner's Manual:

"As a temporary measure, if the recommended
fuel is not available, you may also use regular
unleaded gasoline with an octane rating of
87 AKI/91 RON. This may reduce engine performance
and increase fuel consumption. Avoid
driving at full throttle and sudden acceleration."

So it seems you are OK as long as you avoid driving at full throttle and accelerating suddenly.

I guess the open question is whether you actually save money -- does the possible reduced fuel economy offset the price difference.

If that is really the case for someone and that someone really wants to maintain engine performance then a bottle of octane booster might be a good idea. Most gas stations carry them and all it will be is an extra $5 on top of your tank of gas.
 

·
Registered
Joined
·
30 Posts
Discussion Starter · #15 ·
According to the GLE Owner's Manual:

"As a temporary measure, if the recommended
fuel is not available, you may also use regular
unleaded gasoline with an octane rating of
87 AKI/91 RON. This may reduce engine performance
and increase fuel consumption. Avoid
driving at full throttle and sudden acceleration."

So it seems you are OK as long as you avoid driving at full throttle and accelerating suddenly.

I guess the open question is whether you actually save money -- does the possible reduced fuel economy offset the price difference.
You sound like a rational person; I appreciate your reply. As I said before, I drive to work, gym, shopping etc. My drag racing days are long behind me. I have never needed to extract the absolute maximum performance out of my car's engine. If I did, I would certainly buy premium fuel, but I would also upgrade my tires and brakes.

Owner's manuals aside, I would be interested in your reply to one of my earlier queries: what seems more likely to you 1) cars literally needs premium fuel to function properly/better or 2) the "idea" of premium fuel is a con perpetrated by car makers and big oil to extract more money from consumers.
 

·
Registered
Joined
·
2 Posts
As has been stated...modern, computer controlled cars will run ok, without damage, on lower grade of gasoline. However, higher octane prevents pre-ignition in high-compression engines. The on-board computer will detect pre-ignition (what we called "pinging" in the old days) and adjust timing, etc. to prevent it. Thus no engine damage. However, the changes to engine settings will change performance, including fuel economy. Thus, using regular in engines designed for premium is, in most cases, false economy. Cost/gallon less, but, miles/gallon less also.
So, everyone is right. You CAN run regular engine in a GLE without damage. But you probably aren't saving much money on fuel.
 

·
Registered
Joined
·
4 Posts
I started using premium gas until the car was broken in. Then a friend, who has had high end luxury and sports cars forever told me it is absolutely a waste of money to put in premium gas. I started driving regular and had the car for two years running only regular with no problems. However, this summer, in the extended extreme heat and humidity running the a/c all the time, I did notice a bit of lag. I put in a couple tanks of premium and the car was definitely peppier than it had been. I turned in the car off lease before the weather changed, so I did not have a chance to swap back to regular to see if that had any noticeably adverse effect. I plan to put premium in my new GLE for the first 1000 miles or so, then once break in is over, swap back to regular.
 

·
Registered
Joined
·
1 Posts
Interesting, so the Mercedes dealer I worked for in Savannah would not allow premium fuel in any of their cars, BMW, Mercedes and GMC dealer. He has a friend that owns a large fuel company that convinced him that premium really wasn’t any different than regular. I always leased BMW’s and never put high test in any of them I I never noticed any lack of power or knocking. Now that I’m retired and own vs lease I alternate regular and premium every other tank. Paranoid I guess. Good luck.
 
1 - 20 of 20 Posts
Top