FACTORY RACING Penrite 10 Tenths Racing products are used by Factory Race Teams to provide the ultimate in performance and protection. Penrite Oil. Synthetic 20W40 Engine Oil. 10 Tenths Race Castor is an ashless SAE 20W-40 engine oil manufactured from high quality Castor vegetable oil, Synthetic Ester, anti-corrosion Additives and an advanced anti-oxidant.
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