It's so cold that the car won't start. What seems to be the reason for the shortage of oil supply?

As we all know, starting a car for the first time in the morning after the cold weather is not easy to ignite, or it is on fire but the idle speed is unstable, and it will turn off after a little step on the accelerator, or even if it is serious, it will not ignite at all, even if the battery is dead! There is a fire, and the idle speed is good. The throttle is about to start, one meal at a time, and there is no oil at all, but just run for a few hundred meters! And only in the morning, the whole day will be relaxed! Even if the car stops for a little longer during the day, it can catch fire several times! This kind of fault cannot be detected by the computer! (If it can be detected, it will be repaired according to the test results) There are several reasons, so I won't sort it out. Let me talk about them: oil pump, oil pump assembly, nozzle, throttle, idle motor, spark plug, ignition coil, high voltage line, water temperature sensor, and finally battery.