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.
The contaminates in the oil settle when the engine is cold. By running a 1/2 quart into the engine and out the pan, the oil is mearly running over the conaminated oil and out the drain hole without takeing any contaminated oil with it. Best thing to do is change oil when engine is at or near opperating temp.