Royal Purple 11748 High Mileage SAE 5W-30 HMX Synthetic Motor Oil 5 QT - 5 Quart BY BOLD AUTO PARTS STORE HMX - HIGH MILEAGE SYNTHETIC MOTOR OIL - SAE 5W-30 Multiple Quantities Available. Select between Packs of 1, 2, 3, 4, 5, 6, 7, 8, 10, or 12. Driving an older vehicle? Does it have at least 75,000 miles on it? HMX is synthetic motor oil specifically designed by Royal Purple engineers to minimize wear inside older engines and restore lost engine performance . .