The definition of feline is an animal that belongs to the cat family, or has the characteristics of a cat. An example of feline is a Siamese cat. An example of feline is a woman house burglar who is stealth and supple. A feline is defined as an animal that belongs to the cat family.
Mobil One and other oil manufacturers recommend checking engine oil levels before driving your vehicle, when the oil is still cold. However, some manufacturers will recommend checking the oil after you've warmed up the engine, so check your owner's manual to find the specific recommendations for your vehicle.
changing the oil when it's warm (though only just warm!) - yes. checking the level - cold on a flat surface. Likewise changing the oil when warm just allows the sump to drain a little faster, it's a time saver. It doesnt get more from around the engine as some people believe (not suggesting you do CP). You should check engine oil level when warm-just after switching off. I always used to check when cold.