Regular gas vs. Premium - Page 4 - Dodge Challenger Forum: Challenger & SRT8 Forums
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post #31 of 45 (permalink) Old 05-26-2019, 11:49 PM
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LOL, you just reiterated what I just stated. That's exactly what the Feds mandate in our fuel. No if and or but about it. It is Federal law the additives are already put in the fuel you buy weather it's fuel from Walmart or from Shell or Conoco the cleaning agents are already in it. The Brands can add additional additives beyond what's mandated but that's it.
So top tier is a gimmick weather you like it or not.
Now old fuel from not so frequented stations is another issue.

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post #32 of 45 (permalink) Old 05-27-2019, 12:02 AM
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I did not reiterate what you said, you asked me what Top Tier fuel is, I told you exactly, I don't see where the confusion is? The Feds mandate a certain set of additives, Top Tier has additional additives beyond that. I'm not telling you what to buy, I'm just saying Walmart does not have Top Tier, and what Top Tier is. Believe what you will but testing, and I linked to some, shows Top Tier keeps the engine cleaner. If you want to deny that, it's your prerogative, but why you'd want to I can't imagine. A Guy


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post #33 of 45 (permalink) Old 05-27-2019, 04:48 AM
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Quote:
Originally Posted by A Guy View Post
From Sam's Club





Walmart doesn’t sell Top Tier gas.

Just an FYI

A Guy

Yeah I know it's not top tier, but it works and has no issues. I have a Toyota 86, which is a premium only car.
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post #34 of 45 (permalink) Old 05-27-2019, 04:56 AM
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I completely agree with @A Guy on using Top Tier fuel. For me, it's a no-brainer - there have been many tests done that show that it keeps your engine cleaner because of the additional additives that are added above and beyong the "minimum" levels that are mandated. As someone that typically keeps cars for a long time, it can only help.

I do wish that Top Tier stations better "advertised" the fact that they use Top Tier fuel though. I don't think I've ever seen a Top Tier sign/emblem/sticker, etc on a fuel pump - even for stations that I know are Top Tier stations (such as Sunoco, BP, Exxon and Mobile). It would be nice to actually see it on the pump. I noticed that the Top Tier site says that "The TOP TIER logo must be prominently displayed.", but I've yet to see one - and I actually look for it. :-) I'm curious if anyone else has seen it...

Some people say that certification programs like "Top Tier" (for gas) and "Dexos" (for oil) are just about the almighty dollar, but personally, I'm all for them - they help ensure a certain level of quality in the product that you are buying - whether it be for oil, gas or anything else for that matter. It does add some cost, but to me, the additional cost is worth it.
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post #35 of 45 (permalink) Old 05-27-2019, 11:29 AM
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Quote:
Originally Posted by Mud Yapster View Post
Please explain, what does top tier mean to you?
All gas comes from the same manufacturer then all the brand names add their additives and call it theirs. Feds mandate the additives and then the brands can add whatever else they think will make theirs better, so what is top tier? You will need to explain!
Audi
BMW
GM
FCA
Ford
Honda
Toyota
Mercedes Benz
Navistar
VW
Detroit Diesel

are the OEMs that recommend Top Tier grade gasoline (and diesel is also Top Tier availability as well) - due to the reduction over the years of the Federal Minimum Standards for detergent levels in fuel.

the OEMs noted that issues with intake system deposits and combustion chamber deposits were due to the insufficient levels as per minimum standards.

Even FCA has this as recommendation in the owner's manual - if people ever bother to refer to it

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post #36 of 45 (permalink) Old 05-27-2019, 01:39 PM
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When I get back into a challenger again, I'll go back to top tier fuels. My current Toyota can suck it.
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post #37 of 45 (permalink) Old 05-27-2019, 04:08 PM
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Lol!

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post #38 of 45 (permalink) Old 05-27-2019, 04:58 PM
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Quote:
Originally Posted by wjv007 View Post
I have a 2017 scat pack which recommends using 91 octane just wondering if there's really any difference between using regular and premium?
The 392 Pistons are a known problem. The ring gaps are very close to keep compression high and limit "blow by". The top ring groove is extremely close to the top of the piston. This make a very dangerous situation in pre-ignition (low octane) on a high compression engine. In the heat.....you can enter pre-ignition with low grade fuel and the computer cannot pull enough timing fast enough to prevent failure. The ring gap expands and seizes in the bore and the top of the piston breaks off causing major damage. If you run low octane on a 392.....you have a time bomb on your hands. I would NEVER run low octane on this high performance engine under ANY conditions.

Only the 392 is this sensitive to this problem. Running too much boost, running one lean, or too low octane fuel will devastate the 392.
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post #39 of 45 (permalink) Old 05-27-2019, 05:35 PM
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Originally Posted by Solidman View Post
The 392 Pistons are a known problem. The ring gaps are very close to keep compression high and limit "blow by". The top ring groove is extremely close to the top of the piston. This make a very dangerous situation in pre-ignition (low octane) on a high compression engine. In the heat.....you can enter pre-ignition with low grade fuel and the computer cannot pull enough timing fast enough to prevent failure. The ring gap expands and seizes in the bore and the top of the piston breaks off causing major damage. If you run low octane on a 392.....you have a time bomb on your hands. I would NEVER run low octane on this high performance engine under ANY conditions.



Only the 392 is this sensitive to this problem. Running too much boost, running one lean, or too low octane fuel will devastate the 392.
Off topic a little but this might have something to do with the recommended Penzoil Ultra Platinum MS-12633 which is supposed to keep pistons cleaner.


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post #40 of 45 (permalink) Old 05-27-2019, 07:08 PM
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Quote:
Originally Posted by Hal H View Post
Quote:
Originally Posted by Mud Yapster View Post
Please explain, what does top tier mean to you?
All gas comes from the same manufacturer then all the brand names add their additives and call it theirs. Feds mandate the additives and then the brands can add whatever else they think will make theirs better, so what is top tier? You will need to explain!
Audi
BMW
GM
FCA
Ford
Honda
Toyota
Mercedes Benz
Navistar
VW
Detroit Diesel

are the OEMs that recommend Top Tier grade gasoline (and diesel is also Top Tier availability as well) - due to the reduction over the years of the Federal Minimum Standards for detergent levels in fuel.

the OEMs noted that issues with intake system deposits and combustion chamber deposits were due to the insufficient levels as per minimum standards.

Even FCA has this as recommendation in the owner's manual - if people ever bother to refer to it
Thanks for the info I'll be hitting my CONOCO, SHELL, and EXXON up from now on. Those are the main big chains I find around me.

Last edited by Hal H; 05-27-2019 at 07:12 PM.
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