Does a 6.0L LQ9 use 87 octane or 92 octane fuel?

Bill

 

92 or higher octane.

 

huh, the Vortec max trucks use 87 octane...LQ9 too, maybe there is something different? Nothing on them says anything about premium fuel?

 

91+ My truck knocks and pings like hell if i run anything less.

 

My buddy has a 03' SS and all he uses is the cheap stuff, 87 and it runs just fine. Probably not as good as it could though.

 

It doesnt need to have 91 the 04 denali dosnet need 91 it will take 87.

 

sister's denali runs fine on 89.

 

Stock tune LQ9 will run fine on cheap stuff GM isnt going to tune something that wont run on 87 pump gas unless its the damn C6 Z06. The reason 02white6.0's truck wont run on anything less than 91 is because his truck is tuned to the edge as much timing as he can get out of it etc etc.

 

i use deisel

 

Owners manual says to use 91. It also says you can use 87 but the performance will be reduced and you may experience slight knocking.

Mike