Audi Q7 originally uses 0W30 fully synthetic engine oil. For later maintenance, you can also use Castrol EDGE 0W30. The viscosity of engine oil changes with temperature, so special attention should be paid to its performance under low and high temperature conditions. 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, resulting in smoother cold starts for the car. The latter number represents the kinematic viscosity of the oil at 100°C. The higher this value, the better the oil can maintain its viscosity index at high temperatures, which can also be understood as better lubrication performance under high-temperature conditions. The method for changing the engine oil in an Audi Q7 is as follows: Wait for the engine temperature to drop, and also allow the oil to flow back into 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 drain out; Use a special wrench to remove the oil filter; Apply some oil to the oil seal 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, usually filling about three-quarters of the oil container; Start the engine and let it run for 5 minutes, then check for any leaks around the oil drain plug and oil filter. If there are leaks, perform necessary repairs; After stopping the engine, pull out the oil dipstick to check if the engine oil level is within the standard range.
