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Bel-Ray Thumper Racing Synthetic Ester Blend 4T Engine Oil, 15W50.

Amazon.com Price: $44.78 (as of 09/27/2022 19:53 PST- Details)

Full-synthetic 4-stroke motorcycle racing oil. Formulated using specific synthetic esters and refined mineral base oils for modern 4-stroke, single-cylinder, multi-valve racing engines.

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