The original factory oil is the recommended engine oil for the Crown V6, with a viscosity grade of 5W-40. While the factory oil is well-suited for the engine, different oils offer additional benefits such as noise reduction, fuel efficiency, and enhanced performance. Therefore, you may also consider oils from brands like Mobil, Shell, or Castrol. Engine oil viscosity changes with temperature, so it's 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—5W means it can withstand temperatures as low as -30°C. A smaller number here indicates better low-temperature fluidity, ensuring smoother cold starts. The second number represents the oil's kinematic viscosity at 100°C. A higher number means the oil maintains its viscosity better at high temperatures, which can be interpreted as providing superior lubrication under high-temperature conditions. The steps for changing the oil in a Crown V6 are as follows: Wait for the engine to cool down, allowing the oil to drain back into the oil pan. Use a wrench to loosen the drain plug and place an oil pan underneath to catch the old oil until it stops flowing. Start the engine and let it run 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 a small amount of new oil to the gasket of the new oil filter and hand-tighten it clockwise. Add the new oil through the oil filler cap on the engine's valve cover, typically filling about three-quarters of the oil container. Start the engine and let it run for 5 minutes, checking for any leaks around the drain plug and oil filter. If leaks are found, inspect and repair as necessary. After turning off the engine, pull out the dipstick to ensure the oil level is within the standard range.
