My car is loosing engine oil and so every once in a while I need to add anywhere between a liter and two liters to it.
So far, I've done it with the engine warm, and I'm only careful not to let the oil level reach the maximum mark, since after the oil settles the level would raise a little bit more.
So my question is, should I let the engine cool to ambient temperature before adding oil, and is there anything else I should be careful with in regards to my safety and also the cars safety and engine health?