I always threw away the oil plug: a colleague told me what it was really needed for

The asymmetrical design of the plug leaves a small gap when properly inserted. This gap serves a crucial function—it helps to dose the oil, allowing it to be poured in a controlled, steady stream. Gone are the days of messy oil changes and wasted lubricant.

In conclusion, the oil plug is not just another nuisance to be discarded. It plays a vital role in the oil-changing process, facilitating the controlled dispensing of oil. By understanding its purpose and proper usage, we can make the task of changing oil a smoother and more efficient process.