![]() ![]() Total Base Number (TBN) is the measurement of a lubricant’s reserve alkalinity for combating acids. Pour Point indicates the lowest temperature at which a fluid will flow. The NOACK Volatility Test measures the evaporation loss of oils in high temperature service. The High Temperature/High Shear Test (HTHS) measures a lubricant’s viscosity under severe operating conditions. The Thin-Film Oxygen Uptake Test (TFOUT) measures the oxidation stability of engine oils. The competing oils included petroleum-based Castrol GTX, Chevron Supreme, Havoline, Formula Shell and Pennzoil, as well as synthetic-blends Trop Artic and Motorcraft, and full-synthetic Pennzoil Platinum, Quaker State Advanced Full Synthetic and Mobil 1 Extended Performance. AMSOIL Synthetic 10W-30 Motor Oil (ATM) and 10 competing conventional, synthetic and synthetic blend 10W-30 motor oils were subjected to a series of motor oil tests.
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