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Product DescriptionSierra TC-W3 synthetic blend oil. This high performance lubricant has been manufactured and designed to meet and exceed all manufacturers' warranties. Ideal for oil injection systems or pre-mix applications. Significantly reduces aquatic toxicity to fish. Also reduces ring sticking, deposit formation, and exhaust port blockage. Less friction will then allow easier starting. 55 gallons. Sierra Part #18-9500-7.