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

[RyanbabZ71]

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

 

 

Ryan

[Jennabear]

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]

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]

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]

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.

[becker87]

Same here, nothing but 91 or E85 for me, well except one time where the highest choice I had was 89.. woops

[Jennabear]

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!!

[Jennabear]

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).

[VMaxtastic]

Ive been running 91, all we can get around here.

[Daryl LBZ]

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]

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]

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!!

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]

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.

[_Nomad_]

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.

[dgrinnell]

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?