I have been using these for years and think they are great! the reason I use them is so that it prevents any chance of over tightening the drain plug and stretching or stripping the threads. Years ago I had a Saturn that the place that changed my oil over tightened and the bolt fell out, lost all the oil and the engine seized, they did pay for another engine , but it was inconvenient. I even run these on my motorcycle. It makes changing the oil a breeze and mess free in addition to not having to worry about your oil pan.