What does 0-20w mean in engine oil?
1 Answers
The numbers and letters in 0-20w represent viscosity indicators, which are internationally recognized under the SAE (Society of Automotive Engineers) classification. In the SAE classification, the smaller the number, the better the performance at low temperatures. Methods to check engine oil quality include: 1. After pulling out the dipstick, smell it closely. If there is a strong sour odor, it indicates the oil has deteriorated. 2. Rub the old oil between your thumb and forefinger repeatedly. If you feel impurities, poor viscosity, or even a rough texture, it should be replaced promptly. 3. Hold the dipstick at a 45-degree angle under light to observe the oil droplets. If no wear particles are visible, the oil is in good condition. 4. Place a few drops of old oil on a clean white filter paper. After the oil seeps through, high-quality oil will leave no powder residue.