I have a GMC terrain 2017 with over 270,000 miles. Hardly any problems with this car. Lately is been making slight clicking noises after driving over 4 to 5 thousand miles and when I changed the oil they put a small bottle of gas treatment in the tank and the clicking noise went away. Then again after certain miles close to have the oil change again started with the clicking noise so I repeated the process with the gas treatment and clicking went away. My question is will it be a good idea to put premium gas to the car? Will better gas will keep the clicking away until I take it to my mechanic?

  • SirStocks@alien.topBEnglish
    1·
    1 year ago

    Engines have knock sensors to keep them from knocking. If your engine timing is being retarded due to low octane fuel it will definitely benefit from higher octane fuel.

    • ads1031@alien.topBEnglish
      1·
      1 year ago

      You are correct. In fact, GM’s v6 engines (at least) even have separate high octane and low octane spark advance tables, and the ECU switches between them based on the feedback from the knock sensor. However, the difference between high and low octane fuel has never been significant enough for my butt dyno to detect. The only reason I occasionally put a tank of premium through my LGX is because premium has higher detergent concentrations than regular.