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TOMS1SS · 06-10-2011, 12:13 PM

Alright, all this BS I've been seeing with a lot of myths on this forum about what fuels to use. The one that gets me is saying 93 Octane is required for the LS3 and L99. I've seen lots of people ask the same questions about Octane over and over again when the answers are contained in the last place people think to look; the manual. Don't worry LTT people the manual has you covered also. Here it is word for word from the manual itself section 8-44 Recommended Fuel:

If the vehicle has the 3.6L V6 engine (VIN Code V), use regular unleaded gasoline with a posted octane rating of 87 or higher. If the octane rating is less than 87, an audible knocking noise, commonly referred to as spark knock, might be heard when driving. If this occurs, use a gasoline rated at 87 octane or higher as soon as possible. If heavy knocking is heard when using gasoline rated at 87 octane or higher, the engine needs service.

If the vehilce has the 6.2L V8 engine (VIN Code W) or the 6.2L V8 engine (VIN Code J), use premium unleaded gasoline with a posted octane rating of 91 or higher. For best performance, use premium unleaded gasoline with a posted octane rating of 93. You can also use us regular unleaded gasoline rated at 87 octane or higher, but the vehicle's acceleration could be slightly reduced, and a slight audible knocking noise, commonly referred to as spark knock, might be heard. If the octane rating is less than 87 a heavy knocking noise might be heard when driving. If this occurs, use a gasoline rated at 87 octane or higher as soon as possible. Otherwise, you could damage the engine. If heavy knocking is heard when using a gasoline rated at 87 octane or higher, the engine needs service.

- First lets clear something up about 93 octane. While yes you'll get slightly better performance in your L99/LS3 it is likely a minimal benefit and probably a waste of money unless your going to racing or something to that effect. The spec for the L99/LS3 is clear as day 91 octane. It drives me nuts when I see people on this forum say otherwise especially when the difference per gallon between 91 and 93 octane can be .30 cents plus on the gallon.

As for the part about 87 octane being used in the LS3/L99 the engine computer retards the spark to compensate for the lower grade fuel. Commonly people here on Camaro5 complain that their car has reduced performance when the accidentally put 87 octane in and go back to 91 on the next tank. This is because the computer has not reset for the 91 octane and remedy I've seen for resetting the computer would be pulling fuses or unplugging the battery.

For the LTT guys sometimes I see stuff about using 89 or 91 octane in your cars. While it doesn't say anything about using a higher octane, why would you dump a more expensive fuel into your car when you'll get factory performance at 87?

06-10-2011, 12:13 PM	#1
TOMS1SS Drives: NA Join Date: Aug 2010 Location: NA Posts: 12,126 View My Garage	Recommended Fuel Myths (All Engines) Alright, all this BS I've been seeing with a lot of myths on this forum about what fuels to use. The one that gets me is saying 93 Octane is required for the LS3 and L99. I've seen lots of people ask the same questions about Octane over and over again when the answers are contained in the last place people think to look; the manual. Don't worry LTT people the manual has you covered also. Here it is word for word from the manual itself section 8-44 Recommended Fuel: If the vehicle has the 3.6L V6 engine (VIN Code V), use regular unleaded gasoline with a posted octane rating of 87 or higher. If the octane rating is less than 87, an audible knocking noise, commonly referred to as spark knock, might be heard when driving. If this occurs, use a gasoline rated at 87 octane or higher as soon as possible. If heavy knocking is heard when using gasoline rated at 87 octane or higher, the engine needs service. If the vehilce has the 6.2L V8 engine (VIN Code W) or the 6.2L V8 engine (VIN Code J), use premium unleaded gasoline with a posted octane rating of 91 or higher. For best performance, use premium unleaded gasoline with a posted octane rating of 93. You can also use us regular unleaded gasoline rated at 87 octane or higher, but the vehicle's acceleration could be slightly reduced, and a slight audible knocking noise, commonly referred to as spark knock, might be heard. If the octane rating is less than 87 a heavy knocking noise might be heard when driving. If this occurs, use a gasoline rated at 87 octane or higher as soon as possible. Otherwise, you could damage the engine. If heavy knocking is heard when using a gasoline rated at 87 octane or higher, the engine needs service. - First lets clear something up about 93 octane. While yes you'll get slightly better performance in your L99/LS3 it is likely a minimal benefit and probably a waste of money unless your going to racing or something to that effect. The spec for the L99/LS3 is clear as day 91 octane. It drives me nuts when I see people on this forum say otherwise especially when the difference per gallon between 91 and 93 octane can be .30 cents plus on the gallon. As for the part about 87 octane being used in the LS3/L99 the engine computer retards the spark to compensate for the lower grade fuel. Commonly people here on Camaro5 complain that their car has reduced performance when the accidentally put 87 octane in and go back to 91 on the next tank. This is because the computer has not reset for the 91 octane and remedy I've seen for resetting the computer would be pulling fuses or unplugging the battery. For the LTT guys sometimes I see stuff about using 89 or 91 octane in your cars. While it doesn't say anything about using a higher octane, why would you dump a more expensive fuel into your car when you'll get factory performance at 87? __________________ El funcionario señor de los desiertos de Mojave y Sonora.