What are the viscosity grades of Castrol engine oil?
2 Answers
Castrol engine oil includes Edge Full Synthetic, Magnetec Synthetic, GTX Gold, GTX Silver, and GTX. Below is the relevant information: 1. The functions of engine oil are as follows: (1) To separate the surfaces of relatively sliding parts, thereby reducing wear. (2) To carry heat back to the oil tank and dissipate it into the air, helping the radiator cool the engine. (3) To circulate carbon deposits, sludge, and metal wear particles from engine parts back to the oil tank, flushing away contaminants generated on the working surfaces of parts through the flow of the lubricating oil. 2. The characteristics indicating the need for an oil change are: (1) Check the oil viscosity; if there is no viscosity, the oil needs to be changed. (2) The oil color turns black. (3) Excessive black particles, metal shavings, or carbon deposits in the oil. (4) The oil has an unusual smell.
The grade types of Castrol engine oil are mainly determined by viscosity ratings, such as SAE grades like 5W-30, 10W-40, or 0W-20. The first number indicates winter viscosity—the lower, the better (e.g., 0W-20 starts easily in cold weather). The second number represents high-temperature protection, with 30 or 40 preventing leaks in hot conditions. Choose based on climate: 0W-20 for northern regions, 10W-40 for southern stability. Castrol's full-synthetic EDGE series offers multiple grades for high-performance cars, while semi-synthetic MAGNATEC suits daily driving. Incorrect grades can damage the engine or increase fuel consumption, so always refer to the manual—don’t compromise for cheaper options. Consult professionals during maintenance to avoid issues.
