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.
One thing you can do is on a cold morning when the car is cold, start the car and listen for the whine of the air injection pump. It should be on for 30-45 seconds and then shut off. If you can't hear it, tell your mechanic that. You can trace at least the lines to see if there is an obvious loose line or an air leak.