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6.2L (L9H) Owners - Get all your questions answered here

RyanbabZ71
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RyanbabZ71 Senior Enthusiast

RyanbabZ71

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Breaking in? I did my truck at 10k ad the camaro at like 750 miles :)

 

 

Ryan

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DanMan_S
DanMan_S

This is a video showing how the 6.2L sounds with headers and a corsa catback. The crew cab is my 6.2L, the 2005 extended cab is a 5.3L with a magnaflow muffler welded in.    

gonzoid
gonzoid

finished product  

2010LTZ4x4
2010LTZ4x4

Where did you get the 6.2L badge in you avatar?  Heres the info for the 6.2L badge Top Flight Reproductions is proud to announce the addition of the 6.2L emblem to our emblem product line. This embl

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Jennabear Senior Enthusiast

Jennabear

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How many 6.2l owners are actually running 91 octane like they are supposed to?

 

It is shocking the number of owners we encounter who are running 87.

 

Sent from a jelly bean.

 

 

RyanbabZ71 Senior Enthusiast

RyanbabZ71

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My gas cap and manual state 93 premium or E85 for the 6.2. Maybe this has changed since 2010?

 

I have been 100% E85 for over 3 yrs now

 

 

Ryan

Chris Senior Enthusiast

Chris

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Posted

What about places that don't have 93 or E85. Max here is 91 and that's what I run in the 6.0

ChevyTech77 Senior Enthusiast

ChevyTech77

Posted
Posted

How many 6.2l owners are actually running 91 octane like they are supposed to?

 

It is shocking the number of owners we encounter who are running 87.

 

Sent from a jelly bean.

Nothing but premium and E85 in both of my 6.2's since day one.
Jennabear Senior Enthusiast

Jennabear

Posted
Posted

It is sad, the folks who have the newer 5.3L and 6.2L wanting economy and running 87. We have seen the 6.2Ls loose as much as 40HP due to running 87. They are 10.7:1 compression, can't run efficiently!! :rant:

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Jennabear Senior Enthusiast

Jennabear

Posted
Posted

My gas cap and manual state 93 premium or E85 for the 6.2. Maybe this has changed since 2010?

 

I have been 100% E85 for over 3 yrs now

 

 

Ryan

 

 

What about places that don't have 93 or E85. Max here is 91 and that's what I run in the 6.0

91 is the minimum for the 6.2L, and 89 is the minimum for the 5.3L on the NNBS. I would have to check Justin's truck, but I think my gas cap just says flex fuel capable. Most dealerships will not tell consumers that they need to run the higher octane, for fear of driving them away.

 

We have to tell the dealerships to leave the tanks empty, that we will fill them up on our own when we leave the lot (when purchasing).

Daryl LBZ Senior Enthusiast

Daryl LBZ

Posted
Posted

91 is the minimum for the 6.2L, and 89 is the minimum for the 5.3L on the NNBS. I would have to check Justin's truck, but I think my gas cap just says flex fuel capable. Most dealerships will not tell consumers that they need to run the higher octane, for fear of driving them away.

 

We have to tell the dealerships to leave the tanks empty, that we will fill them up on our own when we leave the lot (when purchasing).

 

 

I run nothing lower than 93 octane at all times. I didn't know that the 5.3L was supposed to use 89 I always used 87. If I would have known that I would have ran the 89 if not 93.

RyanbabZ71 Senior Enthusiast

RyanbabZ71

Posted
  • Author
Posted

91 is the minimum for the 6.2L, and 89 is the minimum for the 5.3L on the NNBS. I would have to check Justin's truck, but I think my gas cap just says flex fuel capable. Most dealerships will not tell consumers that they need to run the higher octane, for fear of driving them away.

 

We have to tell the dealerships to leave the tanks empty, that we will fill them up on our own when we leave the lot (when purchasing).

I had a good sales man he filled mine up on premium :)

ChevyTech77 Senior Enthusiast

ChevyTech77

Posted
Posted

It is sad, the folks who have the newer 5.3L and 6.2L wanting economy and running 87. We have seen the 6.2Ls loose as much as 40HP due to running 87. They are 10.7:1 compression, can't run efficiently!! :rant:

See it everyday.

 

Bud of mine couldn't believe the difference in how good his '12 nht ran on premium. His dealer said nothing about it.

 

GM actually did all development testing on the 6.0 and 6.2 on premium. Seen/felt a large difference in a friends hd 6.0 after converting it to premium as well.

 

Never seen a difference in running anything higher than 87 in and of the 5.3's personally.

 

91 is the minimum for the 6.2L, and 89 is the minimum for the 5.3L on the NNBS. I would have to check Justin's truck, but I think my gas cap just says flex fuel capable. Most dealerships will not tell consumers that they need to run the higher octane, for fear of driving them away.

 

We have to tell the dealerships to leave the tanks empty, that we will fill them up on our own when we leave the lot (when purchasing).

I had a good sales man he filled mine up on premium :)

Mine did as well, on both of my 6.2's.

MikeNH Senior Enthusiast

MikeNH

Posted
Posted
My gas cap and manual state 93 premium or E85 for the 6.2. Maybe this has changed since 2010?

I have been 100% E85 for over 3 yrs now

Ryan

 

 

What about places that don't have 93 or E85. Max here is 91 and that's what I run in the 6.0

91 is the minimum for the 6.2L, and 89 is the minimum for the 5.3L on the NNBS. I would have to check Justin's truck, but I think my gas cap just says flex fuel capable. Most dealerships will not tell consumers that they need to run the higher octane, for fear of driving them away.

 

We have to tell the dealerships to leave the tanks empty, that we will fill them up on our own when we leave the lot (when purchasing).

 

 

When I was at the dealer we had the lot kid fill a few VW diesels with 87. That makes a neat noise. :lol:

_Nomad_ Enthusiast

_Nomad_

Posted
Posted

How many 6.2l owners are actually running 91 octane like they are supposed to? It is shocking the number of owners we encounter who are running 87. Sent from a jelly bean.

 

I run 93 octane Premium, always.

  • 3 weeks later...
dgrinnell Enthusiast

dgrinnell

Posted
Posted

Ok guys, Ive been looking and looking but cant seem to find what Im looking for. Im looking to replace just the muffler on my 6.2 but dont want a tone of drone and would like to keep all stock piping except for the muffler. I like the sound of Magnaflow and cant seem to find a 3.5in to 3.5 out. Anyone running one? Im also open to ideas what mufflers is everyone running?

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