I know I have said here, what I told a customer in my shop one day when he was giving me a small amount of grief for the oil change price. He said that "Oil changes are easy".
I told him, "You are correct, if they are done right". The jest was that an oil change is a nightmare if it is done wrong. Let's face it, the oil is the blood of the engine and the oil filter is the kidneys/liver of the engine. Kind of important IMO. Cannot, I repeat, Cannot cheap out on the engine oil and filter or the body "oil and filter" and the processes, without severe ramifications.