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What grade of gas should I use? Octane rating?

Very, very stupid question...

What grade of gas should I use? Octane rating?

Postby tmurph01 [OP] » Sep 15 2010, 9:24pm

... but I just want to make sure. I am nearing my first fill-up and just want to make sure on the grade of gas I put in the truck. The dealer never specified, nor can I find anything on/in the truck to specify. I am guessing any grade will do, but just want to double check.

Truck is a '09 Silverado with the 5.3L.

Thanks in advance.
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Re: Very, very stupid question...

Postby Austin » Sep 15 2010, 9:49pm

For your 5.3L, GM recommends 87 octane or higher. If it was a 6.2L, you should use premium 91 octane or higher.

Make sure to fuel the vehicle with quality fuel. Poor fuel quality causes the engine not to run as efficiently as designed and can cause: stalling after start-up, stalling when the vehicle is changed into gear, misfiring, hesitation on acceleration, or stumbling on acceleration. These conditions might go away once the engine is warmed up. If one or more of these conditions occurs, change the fuel brand used. It will require at least one full tank of the proper fuel to turn the light off.

Gasoline
Use of the recommended fuel is an important part of the proper maintenance of this vehicle. To help keep the engine clean and maintain optimum vehicle performance, we recommend the use of gasoline advertised as TOP TIER Detergent Gasoline.
The 8th digit of the Vehicle Identification Number (VIN) shows the code letter or number that identifies the vehicle’s engine. The VIN is at the top left of the instrument panel. See Vehicle Identification Number (VIN) on page 5-121. If the vehicle has the 5.3L V8 engine (VIN Code 0), the 5.3L V8 engine (VIN Code 3), or the 6.2L V8 engine (VIN Code 2), you can use either unleaded gasoline or ethanol fuel containing up to 85% ethanol (E85). See Fuel E85 (85% Ethanol) on page 5-8. In all other gasoline engines, use only unleaded gasoline.

Gasoline Octane
For all vehicles except those with the 6.2L V8 engine (VIN Code 2), use regular unleaded gasoline with a posted octane rating of 87 or higher. If the octane rating is less than 87, you might notice an audible knocking noise when you drive, commonly referred to as spark knock. If this occurs, use a gasoline rated at 87 octane or higher as soon as possible. If you are using gasoline rated at 87 octane or higher and you hear heavy knocking, the engine needs service.
If the vehicle has the 6.2L V8 engine (VIN Code 2), use premium unleaded gasoline with a posted octane rating of 91 or higher. You can also use regular unleaded gasoline rated at 87 octane or higher, but the vehicle’s acceleration could be slightly reduced, and you might notice a slight audible knocking noise, commonly referred to as spark knock. If the octane is less than 87, you might notice a heavy knocking noise when you drive. If this occurs, use a gasoline rated at 87 octane or higher as soon as possible. Otherwise, you could damage the engine. If you are using gasoline rated at 87 octane or higher and you hear heavy knocking, the engine needs service.
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Re: What grade of gas should I use? Octane rating?

Postby 09_Sierra SLE » Sep 15 2010, 9:59pm

I agree completely. Unless you are running increased timing (i.e. you have a ton of high performance parts... the most important of which would be a cam that requires increased timing to run right) you would be wasting your money with a higher octane fuel. Just run "regular" (87 octane). The higher octanes will do absolutely nothing for your engine.
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Re: What grade of gas should I use? Octane rating?

Postby jepics » Sep 15 2010, 11:12pm

My owners manual (2009 5.3 L) states:
Gasoline Octane
For all vehicles except those with the 6.2L V8 engine
(VIN Code 2), use regular unleaded gasoline with a
posted octane rating of 87 or higher. If the octane rating
is less than 87, you might notice an audible knocking
noise when you drive, commonly referred to as spark
knock. If this occurs, use a gasoline rated at 87 octane
or higher as soon as possible. If you are using gasoline
rated at 87 octane or higher and you hear heavy
knocking, the engine needs service.
If the vehicle has the 6.2L V8 engine (VIN Code 2),
use premium unleaded gasoline with a posted octane
rating of 91 or higher. You can also use regular unleaded
gasoline rated at 87 octane or higher, but the vehicle’s
acceleration could be slightly reduced, and you might
notice a slight audible knocking noise, commonly referred
to as spark knock. If the octane is less than 87, you might
notice a heavy knocking noise when you drive. If this
occurs, use a gasoline rated at 87 octane or higher as
soon as possible. Otherwise, you could damage the
engine. If you are using gasoline rated at 87 octane or
higher and you hear heavy knocking, the engine needs
service.
Gasoline Specifications
At a minimum, gasoline should meet ASTM specification
D 4814 in the United States or CAN/CGSB-3.5 or 3.511 in
Canada. Some gasolines contain an octane-enhancing
additive called methylcyclopentadienyl manganese
tricarbonyl (MMT). We recommend against the use of
gasolines containing MMT.
The highlights on MMT are mine!
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Re: What grade of gas should I use? Octane rating?

Postby tmurph01 [OP] » Sep 15 2010, 11:15pm

Thanks for the replies. That was what I figured, but just wanted to make sure.

Oh,.. and I only use shell gasoline! FTW!
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Re: What grade of gas should I use? Octane rating?

Postby 09_Sierra SLE » Sep 16 2010, 5:13pm

Me too! I come from an oil family, Grandfather, Uncle and Aunt all worked for Shell... But, regardless of that, they do make great gasoline!
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Re: What grade of gas should I use? Octane rating?

Postby KingMidas » Nov 04 2010, 6:03am

My buddy is certified GM mechanic and he said nothin under 87 and only cheveron/texico. I've been runnin shell fuel for the last month and love it. I would stick with those three
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Re: What grade of gas should I use? Octane rating?

Postby EKinMN » Nov 04 2010, 12:57pm

I look for certified "Top Tier" fuels when I can. Otherwise, I go to a local brand, called Holiday. I have consistently seen better MPG with their fuel over others in our area. Last time I did a throttle body cleaning, it did not look bad. So, I think I am running good fuel.
I recomend comparing amoung your local retailers. Your truck may "like" one over the other.
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Re: What grade of gas should I use? Octane rating?

Postby farside1 » Nov 04 2010, 1:14pm

I think all our fuel around me is crap! car still isn't ideling right. dealer said the alcohol content of the fuel was to high :!: So i'm searching for better gas. Might have to break down and pay more at the BP station.. Another reason not to get the 6.2l engine. 97 octane. YOW! That stuff is expensive!
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Re: What grade of gas should I use? Octane rating?

Postby lzn197 » Nov 04 2010, 2:16pm

Here is my view on gasoline. Always use a good quality top tier gasoline. Your fuel injectors and intake valves will love you for it. On very hot days (over 95F) use 89 octane (assuming your vehicle requires 87 octane).
For more info go to:
http://www.toptiergas.com/index.html
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