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Old Apr 11, 2025 | 10:46 AM
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Default Fuel Additive

What’s the best fuel additive for a C7 Grand Sport?
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Old Apr 11, 2025 | 12:44 PM
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Why would you need additive? GM says to use additives if you can't find top tier gas.

Last edited by kodpkd; Apr 11, 2025 at 12:51 PM.
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Old Apr 11, 2025 | 12:58 PM
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If I feel the need to use one, I use Techron. I usually dump a bottle in twice a year or so. I also try to use top tier fuel.
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Old Apr 11, 2025 | 01:03 PM
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I like Techron Complete Fuel System Cleaner or BG Platinum 44K Fuel System Cleaner.
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Old Apr 11, 2025 | 02:40 PM
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redline
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Old Apr 11, 2025 | 04:17 PM
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Originally Posted by odonnrj
What’s the best fuel additive for a C7 Grand Sport?
The only fuel additives that work are PEA based, more specifically Amine based fuel additives as they give a level of detergent to the fuel. Chevron Techron, Redline SL1, etc.

Last edited by fnbrowning; Apr 11, 2025 at 04:19 PM. Reason: Spelling
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Old Apr 11, 2025 | 09:09 PM
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Originally Posted by TxLefty
If I feel the need to use one, I use Techron. I usually dump a bottle in twice a year or so. I also try to use top tier fuel.
This is what I do.
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Old Apr 13, 2025 | 04:48 PM
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I burn a bottle of AMSOIL PI ahead of the annual oil change.
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Old Apr 13, 2025 | 05:03 PM
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The only additive I ever did was torco nothing else is needed. Many of todays gasolines have so much detergents that there’s no need. Unless. You have early direct port injection technology. They tend to get gunky but if you’re under warranty I’d have the dealership deal with that. But if you’re driving spirited much of that gunk goes away. Have a buddy master mechanic says that the best way to keep the gunk off early direct port tech is make sure you’re driving spirited every so often.
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Old Apr 13, 2025 | 05:19 PM
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Originally Posted by odonnrj
What’s the best fuel additive for a C7 Grand Sport?
Best additive.... for WHAT? Storage? Performance boost?

I used to store my cars in the winter up north and used Sta-bil. Never had any issues. Down here in Fla. I drive it all year so I don't add anything. But the ONLY fuel it sees is Mobil 93 oct.
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Old Apr 13, 2025 | 05:31 PM
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Originally Posted by calvins
Best additive.... for WHAT? Storage? Performance boost?

I used to store my cars in the winter up north and used Sta-bil. Never had any issues. Down here in Fla. I drive it all year so I don't add anything. But the ONLY fuel it sees is Mobil 93 oct.
man wish I could get 93 out here 91 is the best out west 😩
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Old Apr 13, 2025 | 06:40 PM
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Originally Posted by SGC7Z
man wish I could get 93 out here 91 is the best out west 😩


Sorry to hear that man. In that case, I'd probably use an octane booster, although GM says 91 is fine.
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Old Apr 13, 2025 | 06:45 PM
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Originally Posted by calvins


Sorry to hear that man. In that case, I'd probably use an octane booster, although GM says 91 is fine.
there’s good e out here so I’m gonna do a flex fuel tune run e in the summer and 91 in winter
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Old Apr 13, 2025 | 07:50 PM
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Originally Posted by SGC7Z
man wish I could get 93 out here 91 is the best out west 😩
Out here, where. In California?
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Old Apr 13, 2025 | 07:51 PM
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Originally Posted by kodpkd
Out here, where. In California?
AZ much like every where out here 😩
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Old Apr 13, 2025 | 08:01 PM
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91 is fine and if you are using Top Tier gas you are getting all the detergent you need. Maybe a bottle of Techron at each oil change.
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Old Apr 13, 2025 | 08:20 PM
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Have you looked for high octane fuel there?
From the current C7 manual:
"Using unleaded gasoline rated below 93 octane, however, will lead to reduced acceleration and fuel economy. If knocking occurs, use a gasoline rated at 93 octane as soon as possible, otherwise, the engine could be damaged".

Last edited by kodpkd; Apr 14, 2025 at 09:23 AM.
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Old Apr 16, 2025 | 06:50 AM
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Originally Posted by odonnrj
What’s the best fuel additive for a C7 Grand Sport?
Just use a very high quality Top Tier gas like Shell or Costco and you won't need any additives
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Old Apr 16, 2025 | 11:51 AM
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To be clear, Techron should be used in your last tank of gas PRIOR to the oil change. And to be even more clear, burn up that tank of gas prior to the oil change.

Last edited by Widgeon5; Apr 19, 2025 at 06:53 PM. Reason: obvious clarification
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Old Apr 16, 2025 | 02:15 PM
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91 vs 93 - When traveling NW from DFW I usually see the octane switch (93 to 91) in the Amarillo area. If my memory is working at all, after that it seems like 98% 91 octane.
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