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.
If it has coolant in it when your car is completely cold, like after sitting all night, then your cooling system should be full and free of air. If you check the reservoir and find it empty, it is an indication that you have a low coolant level, even if it has some coolant in it when your car is warm. If you find an empty coolant reservoir it is an indication that you have a leak in your cooling system. If this is the case, add BlueDevil Radiator and Block Sealer before you top off your cooling system with new coolant.