Mazda3 Axela's original factory oil specification is 0W-20, and the brand is Idemitsu from Japan. If you want to change the oil during later maintenance, you can choose brands such as Mobil or Castrol. The viscosity of engine oil changes with temperature, so special attention should be paid to its performance under both low and high temperatures. For example, in 5W-30, the first number indicates low-temperature fluidity. 5W means it can withstand temperatures as low as -30°C. The smaller this number, the better the low-temperature fluidity, making cold starts smoother. The second number represents the kinematic viscosity of the oil at 100°C. A higher value means the oil can maintain its viscosity index better at high temperatures, which can also be understood as better lubrication performance under high temperatures. The method for changing the oil in a Mazda3 Axela is as follows: Wait for the engine temperature to drop, allowing the oil to flow back into the oil pan. Use a wrench to loosen the oil drain plug and place 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 drain. Use a specialized wrench to remove the oil filter. Apply oil to the seal of the new oil filter and tighten it clockwise by hand. Add new oil through the engine valve cover filler port. Generally, fill up to three-quarters of a standard oil container. Start the engine and let it run for 5 minutes. Check for oil leaks around the drain plug and oil filter. If any leaks are found, perform necessary repairs. After stopping the engine, pull out the dipstick to check if the oil level is within the standard range.
