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Royal Purple HPS High Performance Street Synthetic Motor Oil - 10W30 - 1 Quart (Case of 6) QA1 Callies then subjects this materialRoyal Purple HPS Series motor oil is specifically formulated to maximize performance and meet the demands of high performance and modified engines. HPS is high performance street motor oil recommended for vehicles no longer under manufacturer warranty and for those seeking a higher level of performance and protection. Royal Purples premium synthetic motor oil and synthetic lubricants have been designed to improve performance in all conditions and