GMBoy Joined Nov 22, 2004 Messages 10,047 Location Texas Aug 12, 2014 #61 I've got 65k miles on a set of Autolite Iridium XP's in a GMC Sierra Denali 6.0L and performing perfectly. I am going to change them soon anyhow as regular maintenance but seem like they would go much further.
I've got 65k miles on a set of Autolite Iridium XP's in a GMC Sierra Denali 6.0L and performing perfectly. I am going to change them soon anyhow as regular maintenance but seem like they would go much further.
