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In Japan, they typically use higher octane gasoline than we do. So many parts, if they are for a Japanese car, will "require" very high octane gas that is available at the pumps in Japan. However, you can get octane booster here. I'm not quite sure how it works or how exactly you use it, but if you fill up with 91 and pour a bottle of octane booster into the tank with the gas, I guess it boosts the octane higher than 91.
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________________________________________Mark Brown 1991 Volkswagen Jetta (1.8L I4/5-speed/FWD)
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