What type of engine oil does the BJ40 use?
1 Answers
BJ40 uses 5W-40 engine oil as specified by the manufacturer. The entire BJ40 series is equipped with turbocharged engines, so it is recommended to use full synthetic oil with a viscosity of 40. Turbocharged engines have higher requirements for engine oil. The BJ40 uses factory-recommended oil, but if you wish to change the oil during later maintenance, you can choose from brands such as Shell, Mobil, Castrol, or Total. The viscosity of engine oil changes with temperature, so it is important to pay attention to its performance under both low and high temperatures. For example, in 5W-30, the first number indicates low-temperature fluidity, where 5W means it can withstand temperatures as low as -30°C. The smaller this number, the better the low-temperature fluidity, ensuring smoother cold starts for the car. The second number represents the kinematic viscosity of the oil at 100°C. A higher number means the oil can maintain its viscosity better at high temperatures, which can also be understood as better lubrication performance under high-temperature conditions. The method for changing the oil in the BJ40 is as follows: Wait for the engine temperature to cool down, allowing the oil to flow back into the oil pan. Use a wrench to loosen the oil drain plug and place an oil pan underneath to catch the old oil until it stops flowing. Start the engine for about 30 seconds to allow the oil in the main oil passages to drain out. Use a specialized wrench to remove the oil filter. Apply oil to the gasket of the new oil filter and tighten it clockwise by hand. Add the new engine oil through the oil filler cap on the engine valve cover. Typically, fill about three-quarters of the oil container. Start the engine and let it run for 5 minutes, checking for any leaks around the oil drain plug and oil filter. If leaks are found, perform necessary repairs. After stopping the engine, pull out the dipstick to check that the oil level is within the standard range.
