This Just In... All 2008's must run PREMIUM!

[Agriv8r]

2000 miles in burning 87, no problems at all...no pings, no issues....

[devilsfan]

I agree. Was the engine in the 08 drastically changed from previous years? I've been running 87 in my 03 since day 1 with no issues.

Big question is - if you run 87 in an 08 and DO have issues, will your warranty still cover it?

Stacy

[DennisAJC]

Originally Posted by errett

I envision this like a construction worker whistle from the truck to Dennis!

E

I get that alot too but this whistle is definitely from my H2.

[DennisAJC]

Originally Posted by NewHummerGuy

You, my friend errett, are referring to the MOTORBOATIN KING of the nothern United States

Starting to sound like another H2 club....

TEAM MOTORBOAT - Northern US Hummer Chapter

"We're Sons Of Bitches"

[NewHummerGuy]

TEAM MOTORBOAT - Northern US Hummer Chapter

"We're Sons Of Bitches"

[/quote]


Holy $hit. Ok no one steal this. Its mine all mine

[DennisAJC]

Originally Posted by NewHummerGuy

Holy $hit. Ok no one steal this. Its mine all mine

HAHAHA!!!! It's a better name than that ghey sheep something.

[Sewie]

Originally Posted by DennisAJC

HAHAHA!!!! It's a better name than that ghey sheep something.

HEY!!! Don't piss off the sheep!

http://www.blacksheep-themovie.com/

[mikejr]

Originally Posted by Agriv8r

2000 miles in burning 87, no problems at all...no pings, no issues....

a tad over 1500 on my burning up the 87 octane and no pings or other issues. Maybe i'll dump in a load of hi-test and see how it runs....

[DennisAJC]

Originally Posted by Sewie

HEY!!! Don't piss off the sheep!

http://www.blacksheep-themovie.com/

JEEBUS! You know I'm teasing!

[Takecover]

Originally Posted by devilsfan

I agree. Was the engine in the 08 drastically changed from previous years? I've been running 87 in my 03 since day 1 with no issues.

Big question is - if you run 87 in an 08 and DO have issues, will your warranty still cover it?

Stacy

Yes, in the event you have an internal engine problem, the tech, or field rep would check the ECM history of knock detectors, and run a fuel quality test. I would make sure you had premium fuel in the tank in the event of a failure. I have seen warranty work declined for poor fuel quality!

Jimmy

[H2Finally]

Originally Posted by Sewie

HEY!!! Don't piss off the sheep!

http://www.blacksheep-themovie.com/

The one scene that cracks me up was when that guy in boxers was smokin an after-sex cigarrette, and an ewe walked in from the bathroom door, and he said to the other guy starring at them dumb-foundedly, "you wouldn't understand..."

[dochummer]

My cousin's been running premium in his 2003 H2 since he got it. He says it pings on him when he runs regular...

[Hummer Guy]

I may have to call BS on the 'bulletin'....There's no recent bulletins of that nature and no bulletin that mentions octane in the last 2 years in H2 or H3...Not sure what the owners manual says, but I haven't seen anything from GM about it...

[johndjmix1]

Weird. I run 87 in my 2006 AND I have the supercharger. Still no pings.

--John

[Hummer Guy]

Alright, I looked a little further and found a "facts and myths" bulletin on fuel/additives for ALL 2008 and prior GM cars and trucks:

This is straight from the bulletin:
? Use the Recommended Grade (Octane) Fuel

Purchasing higher than required octane fuel is a waste of money. Using higher octane fuels in a vehicle that only required regular unleaded fuel will neither increase performance nor improve gas mileage. In all cases refer to your owners manual and ONLY use the octane rated fuel recommended for your vehicle.

Important: In high performance GM vehicles that DO require Premium (91 octane or higher) fuel, you MUST use fuels of at least this octane. Use of lower octane fuel may result in reduced performance, knocking, and/or permanent engine damage not covered under the terms of the New Vehicle Warranty.

This is straight from the 08 manual:

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 your 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.

_________________________________

So, I read the owners manual as 87 octane is acceptable for use. I've driven a ton of 08s on regular octane and never heard any knocking. The bulletin talks about vehicles that "Require premium" and the manual says "You can also use regular unleaded gasoline rated at 87 octane."

The high performance cars I've seen that run on higher octane say "Always use premium fuel, below 91 octane may damage engine components bla bla bla"

87 Octane is fine in 2008 H2s and H3s - has anyone here heard knocking?

[blackhawk29]

after reading the instructions (owners manuel) it seems like gm has learned that we build or buy something first then read instructions later....checked the manual and sure as the sun comes up it says to run 91+ octane (premium fuel) did they "forget" to place this below the fuel gauge, or on the filler cap? I have owned several cars that required premium and all said it on the cluster. I drive a lot of miles and this will add up fast. Maybe this expains my consistant rough idle.

[mikejr]

Originally Posted by Hummer Guy

Alright, I looked a little further and found a "facts and myths" bulletin on fuel/additives for ALL 2008 and prior GM cars and trucks:

This is straight from the bulletin:
? Use the Recommended Grade (Octane) Fuel

Purchasing higher than required octane fuel is a waste of money. Using higher octane fuels in a vehicle that only required regular unleaded fuel will neither increase performance nor improve gas mileage. In all cases refer to your owners manual and ONLY use the octane rated fuel recommended for your vehicle.

Important: In high performance GM vehicles that DO require Premium (91 octane or higher) fuel, you MUST use fuels of at least this octane. Use of lower octane fuel may result in reduced performance, knocking, and/or permanent engine damage not covered under the terms of the New Vehicle Warranty.

This is straight from the 08 manual:

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 your 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.

_________________________________

So, I read the owners manual as 87 octane is acceptable for use. I've driven a ton of 08s on regular octane and never heard any knocking. The bulletin talks about vehicles that "Require premium" and the manual says "You can also use regular unleaded gasoline rated at 87 octane."

The high performance cars I've seen that run on higher octane say "Always use premium fuel, below 91 octane may damage engine components bla bla bla"

87 Octane is fine in 2008 H2s and H3s - has anyone here heard knocking?

No i've had no knocks, but the engine does idle a bit rough. But I just figured it was how the engine was supposed to idle. Almost like it has a hypo cam in it or something.

[Alan06SUT]

I bet mid grade would work fine.

[Agriv8r]

Originally Posted by blackhawk29

after reading the instructions (owners manuel) it seems like gm has learned that we build or buy something first then read instructions later....

[Hummer Guy]

Originally Posted by mikejr

No i've had no knocks, but the engine does idle a bit rough. But I just figured it was how the engine was supposed to idle. Almost like it has a hypo cam in it or something.

I don't think higher octane would smooth the idle, but I agree that 2008 models idle a little rougher. The exhaust, to me, sounds a lot better too (more aggressive), and that's just one of the 'downsides' to having the bigger, nearly 400 HP engine in the '08