When changing engine oil, which steps should be taken?

Changing engine oil is an essential maintenance task that ensures the engine runs smoothly and efficiently. To perform this task correctly, first warming the oil by running the engine is beneficial because it reduces the viscosity of the oil, making it much easier to drain completely. Warm oil flows out more quickly and thoroughly than cold oil, helping to remove contaminants and sludge that accumulate in the system.

After the engine has warmed up, it is crucial to stop the engine and disconnect the spark plug. Shutting off the engine prevents any accidental starts while you are working on it, which enhances safety. Disconnecting the spark plug also serves to eliminate the risk of ignition, ensuring that the engine cannot be started inadvertently. This step is particularly important during maintenance procedures, as it keeps the user safe.

Therefore, the combination of running the engine and then stopping it to disconnect the spark plug is critical in ensuring a proper and safe oil change. Using fresh oil immediately is also important but follows after the old oil has been fully drained and replaced. Thus, the combination of warming the oil and ensuring safety by disconnecting the spark plug outlines the correct and safe procedure for changing engine oil.