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Originally Posted by david90 Just follow what your manufacturer recommends.
using octane higher than what your manufactuer recommends won't harm your engine but less will. If ur superchargeed or turboed u probably need 91 octane |
HIGHER octane can potentially damage your engine by putting extra carbon "gunk" into it, because unburned gasoline will remain in the engine causing more friction, heat, and wear and tear. Less octane can harm your engine much more, but too high will harm your engine too.