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Recommended Treatment: 4 ounces Performance Formula per 15 gallons of fuel Add Stanadyne Additives to tank before filling with diesel fuel to ensure thorough mixing. Tighten bottle cap securely after use and store upright. Store above 32???F (0???C). All Stanadyne Diesel Fuel Additives can be blended with each other and "double-dosing" is not damaging - although it may not provide twice the benefit. Where engine and vehicle Original Equipment Manufacturers (OEMs) have approved Stanadyne, most of them recommend Stanadyne Performance Formula, which should be used at every refueling year-round to ensure protection against fuel related problems and to maximize performance.