Teste de Proficiência Interlaboratorial: - Esquema Oils and Fuels OIL; - Amostra 05: Lubrificantes de óleo de motor; - Amostra fornecida: 1 x ¾ US gal (~ 2800 ml) amostra de óleo; - Principais Analítos: Shear Stability; Acid Number (potentiometric); Barium; Calcium; Magnesium; Molybdenum; Phosphorous; Potassium; Silicon; Sodium; Zinc; Ash; Ash Sulfated; Base Number; Density; Evaporation Loss (Noack); Flash Point (Open Cup); Flash Point (Closed Cup); HTHS Viscosity; Nitrogen; Pour Point; Saponification Number; Sulfur Content; Viscosity, Kinematic @40°C; Viscosity, Kinematic @100°C; Viscosity, Tapered Plug; Viscosity, Tapered Bearing; Viscosity, Low Temperature; Viscosity, Low Temperature @ 5000 mPa*s (cP); @ 10000 mPa*s (cP); @ 20000 mPa*s (cP); @ 30000 mPa*s (cP); @ 40000 mPa*s (cP); Gelation index; Gelation Index Temp; Volatility ? (GC); Water (Procedure A); Water (Procedure B); Water Content; Color.