评一个产品好不好,看数据比较说明问题;打群架不管用,但很生动有趣。 1.The Thin-Film Oxygen Uptake Test (TFOUT) (ASTM D-4742) measures the oxidation stability of engine oils. Mobil 1 ------------------------469 min Motorcraft Synthetic Blend --------------277 min Castrol GTX ---------172 min 2. The High Temperature/High Shear Test (HTHS) (ASTM D-4683) measures a lubricant’s viscosity under severe operating conditions. Mobil 1 ---------------- 3.22 cP Motorcraft Synthetic Blend --------------- 3.05 cP Castrol GTX --------------- 3.19 cP 3. Evaporation Loss of Lubricating Oils Test (NOACK ) (ASTM D-5800) measures the evaporation loss of oils in high temperature service. Mobil 1 --------------- 7.49 % Motorcraft Synthetic Blend ----------------- 8.84 % Castrol GTX ------------- 6.77 % 4. Pour Point Test (ASTM D-97) indicates the lowest temperature at which a fluid will flow. Mobil 1 ------------ -57 F Motorcraft Synthetic Blend ----- -25 F Castrol GTX ------ -29 F 5. Total Base Number Test (TBN) (ASTM D-2896) is the measurement of a lubricant’s reserve alkalinity for combating acids. Mobil 1 ------------11.89 mg KOH/g Motorcraft Synthetic Blend -------- 8.00 mg KOH/g Castrol GTX --------- 8.52 mg KOH/g 6. The Cold Cranking Simulator Test (CCS) (ASTM D-5293) indicates the degree to which a lubricant can impact cold weather starting. -25 ▫C Viscosity (cP): Mobil 1 ---------- 4742 Motorcraft Synthetic Blend --------- 4021 Castrol GTX ------------ 6101 7. The Four-Ball Wear Test (ASTM D-4172) evaluates the protection provided by engine oil under conditions of pressure and sliding motion. Wear Scar Diameter (mm): Mobil 1 ---------- 0.55 Motorcraft Synthetic Blend ----------- 0.65 Castrol GTX ----------- 0.60 |