What is the engine oil specification for the old Mazda 6?

[LaMia]

The old Mazda 6 requires fully synthetic engine oil with specification SM 0W-20. For subsequent maintenance oil changes, you may choose brands such as Mobil, Shell, Castrol, or Total. Engine oil viscosity changes with temperature variations, so special attention should be paid to its performance under both low and high temperatures. For example, in 5W-30 oil: the first number indicates low-temperature fluidity (5W means it can withstand -30°C, with smaller numbers indicating better cold-weather performance and easier cold starts), while the second number represents kinematic viscosity at 100°C (higher values maintain better viscosity and lubrication under high temperatures). The oil change procedure for the old Mazda 6 is as follows: Wait for the engine to cool down, allowing oil to drain back to the oil pan; Loosen the drain plug with a wrench, collecting old oil in a container until flow stops. Start the engine briefly (30 seconds) to drain remaining oil from main galleries; Remove the oil filter using a special wrench; Apply oil to the new filter's gasket and hand-tighten it clockwise; Add new oil through the valve cover filler port (typically filling 3/4 of a standard oil container); Run the engine for 5 minutes, checking for leaks at the drain plug and filter; After stopping the engine, verify oil level using the dipstick, ensuring it falls within the standard range.