Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum banner

87 octane

  1. Burned exhaust valves

    OEM Issues
    Just wondering. The local Chevrolet dealership has seen 6 TB of years 02 - 04 with burned exhaust valves over the last several months. They claim it is sorry local 87 octane fuel and are recommending the use of 89 for this reason. The area I live in is a small rural city with two fuel...