Which brand of engine oil is best for Santana?

[OMiguel]

Volkswagen Santana uses Volkswagen's original engine oil with the specification of 5w40, which is synthetic oil. If you want to change the oil during later maintenance, you can choose international brands such as Shell, Mobil, and Castrol, or domestic brands like Great Wall, Tongyi, and Kunlun. The viscosity of engine oil changes with temperature, so special attention should be paid to its performance under low and high temperatures. For example, in 5W-30, the first number indicates low-temperature fluidity. 5W means it can withstand low temperatures of -30°C. The smaller this number, the better the low-temperature fluidity, and the smoother the cold start of the car will be. The latter number represents the kinematic viscosity of the oil at 100°C. The higher the value, the better it can maintain viscosity at high temperatures, which can also be understood as better lubrication performance under high temperatures. The method for changing the engine oil of Volkswagen Santana is as follows: Wait for the engine temperature to drop, and also allow the oil to flow back to the oil pan; Use a wrench to loosen the oil drain plug and use an oil pan to catch the old oil until no more oil flows out. Start the engine and let it run for 30 seconds to allow the oil in the main oil passage to flow out; Use a special wrench to remove the oil filter; Apply oil to the oil seal of the new oil filter and tighten it clockwise by hand; Add the new oil through the oil filler cap on the engine valve cover. Generally, three-quarters of a barrel of oil is sufficient; Start the engine and let it run for 5 minutes, then check for oil leaks at the oil drain plug and oil filter. If there are any, repairs should be made; After stopping the engine, pull out the oil dipstick and check that the engine oil level is within the standard range.