Octane for LS3
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Instructor
Joined: Jun 2007
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From: Fort Lauderdale FL
Octane for LS3
Stumbled on this new motortrend article on the new LS3: http://www.motortrend.com/features/a...09_ls3_engine/
In one section it mentions
"There is still no guzzler tax, the car runs on regular fuel, and emissions are even improved-by 40 percent in NOx and 12 percent in hydrocarbons. The LS3 is even more efficient to manufacture. It's a true win-win-win situation."
Can this be said to mean the 2008/LS3 runs on 87 octane no problem? Or are we still to think that 91/93 is recommended?
In one section it mentions
"There is still no guzzler tax, the car runs on regular fuel, and emissions are even improved-by 40 percent in NOx and 12 percent in hydrocarbons. The LS3 is even more efficient to manufacture. It's a true win-win-win situation."
Can this be said to mean the 2008/LS3 runs on 87 octane no problem? Or are we still to think that 91/93 is recommended?
Le Mans Master
Joined: Sep 2004
Posts: 7,978
Likes: 1,849
From: North/Central NJ - a.k.a. Gotti in the CFNE section
St. Jude Donor '05
Stumbled on this new motortrend article on the new LS3: http://www.motortrend.com/features/a...09_ls3_engine/
In one section it mentions
"There is still no guzzler tax, the car runs on regular fuel, and emissions are even improved-by 40 percent in NOx and 12 percent in hydrocarbons. The LS3 is even more efficient to manufacture. It's a true win-win-win situation."
Can this be said to mean the 2008/LS3 runs on 87 octane no problem? Or are we still to think that 91/93 is recommended?
In one section it mentions
"There is still no guzzler tax, the car runs on regular fuel, and emissions are even improved-by 40 percent in NOx and 12 percent in hydrocarbons. The LS3 is even more efficient to manufacture. It's a true win-win-win situation."
Can this be said to mean the 2008/LS3 runs on 87 octane no problem? Or are we still to think that 91/93 is recommended?
I saw that too... However, nothing but 93 will go in my tank lol
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St. Jude Donor '05-'06-'07-'10
Stumbled on this new motortrend article on the new LS3: http://www.motortrend.com/features/a...09_ls3_engine/
In one section it mentions
"There is still no guzzler tax, the car runs on regular fuel, and emissions are even improved-by 40 percent in NOx and 12 percent in hydrocarbons. The LS3 is even more efficient to manufacture. It's a true win-win-win situation."
Can this be said to mean the 2008/LS3 runs on 87 octane no problem? Or are we still to think that 91/93 is recommended?
In one section it mentions
"There is still no guzzler tax, the car runs on regular fuel, and emissions are even improved-by 40 percent in NOx and 12 percent in hydrocarbons. The LS3 is even more efficient to manufacture. It's a true win-win-win situation."
Can this be said to mean the 2008/LS3 runs on 87 octane no problem? Or are we still to think that 91/93 is recommended?
Team Owner
Joined: May 2004
Posts: 82,175
Likes: 1,319
From: McKinney TX
St. Jude Donor '21-'22-'23-'24
2007 owner's manual, page 320, for the LS2 engine.
I suspect the 2008 owner's manual will read the same for the LS3 engine.
Gasoline Octane
If your vehicle has the 6.0L V8 engine (VIN
Code U), use premium unleaded gasoline with a
posted octane rating of 91 or higher. You may also
use regular unleaded gasoline rated at 87 octane
or higher, but your vehicle’s acceleration may
be slightly reduced, and you may notice a slight
audible knocking noise, commonly referred to
as spark knock.
If your vehicle has the 6.0L V8 engine (VIN
Code U), use premium unleaded gasoline with a
posted octane rating of 91 or higher. You may also
use regular unleaded gasoline rated at 87 octane
or higher, but your vehicle’s acceleration may
be slightly reduced, and you may notice a slight
audible knocking noise, commonly referred to
as spark knock.
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Team Owner
Joined: Feb 2001
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From: Short Hills, NJ
It's true, one can choose the lower octane fuels if desired. 
Not that it matters much but the LS3 does have a lower compression ratio (typically speaking, a higher CR requires higher octane) than the LS2 (10.7:1 versus 10.9:1 for the LS2) but again that likely isn't much of a factor in this case.
Not that it matters much but the LS3 does have a lower compression ratio (typically speaking, a higher CR requires higher octane) than the LS2 (10.7:1 versus 10.9:1 for the LS2) but again that likely isn't much of a factor in this case.
