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Octane booster/eng knock

Engine

Vehicle Information: Year: 1987; Engine (Size, Modifications): 3.6 Turbo; Total Mileage: 39,000;

Just purchased, using 91 Octane engine has knock on heavy acceleration. Purchased car in midwest using 93 octane, no knocking. Is there a recommended octane boost on the market.?C.D.

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