octane

  1. Leannadanna

    Is there such a thing as too much octane? '96 4.6L LX Seafoam

    Hi! I have a '96 4.6L LX. Despite using high quality (Chevron) premium octane (91) fuel, as well as checking the oil regularly, my car makes an audible tapping noise and gets a little sluggish when accelerating from 2nd to 3rd. I've been experimenting with octane booster, first with regular...
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