Royal Purple

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Do "Super Coolants" Lower Engine Temperature By 30 Degrees?Mar 2025 · as Royal PurpleReserve Alkalinity (pH after acid): 4 of 9Lubricity (Wear Scar): 4 of 7Heat Exchange (Cumulative Temp Difference): 6 of 7
How Bad Are Cheap "Diesel" Motor Oils? $14 vs $58Jun 2024 · as Royal PurpleFlow speed at 70° F: 2 of 5Evaporative loss: 2 of 6Wear scar: 4 of 6