Why does the host sound "cold" in winter?

Today, the host does not sound. The previous day, the host still had a sound of friction, but that's why I have a question today. It must be related to the temperature. What kind of host is related to the temperature? In addition, the relationship is between 18 degrees and 11 degrees. For such a small change, the sound source is probably near the CPU. It turns out to be a fan. Specifically, it is the fan lubricant, in the cold weather, the lubricating oil has been solidified, so the first boot is equivalent to the fan without lubricating oil rotating, the problem is found, although it will be good, but it is always so friction is not good, one method is to start the machine at noon, but this is extremely inflexible. Here we will introduce another method. The method here is for reference only. I have not conducted a "clinical trial" and you will be at your own risk.
Private lubricating oil for Fan Bearings in Winter Prepared by a netizen, now contributing formula for free: Mobil 1 No. Synthetic Oil 20% Very expensive. Ask the driver for a little bit. Refined white oil 70% , Very cheap, 1 $1 bottle. WD-40 10% , famous anti-friction detergent, strong cleaning bearings, known as fairy water. Effect: Make your fan work in a severe environment. oh, by the way, I have to explain it. At ordinary times, many people use the oil in the fan. The oil is a refined mineral oil with a certain amount of anti-rust agent, which is much better than the crude oil. But the oil is still too thin, the volatility is still too strong, it is used to dry up, is not conducive to the bearing for a long time to work. Therefore, the viscosity and volatile oil should be added. Modern automotive lubricants contain a variety of additives, heat resistance and acid resistance, and stable performance. This mixed oil has a moderate viscosity. It is more than enough for light-loaded Fan Bearings. Besides, WD-40 is a famous anti-wear cleaning lubricant, which can easily remove dirt from the bearing, and protect the metal surface. Originally, I wanted to find a car oil (it must be a new one). I did not expect to find the expensive full synthesis Mobil 1. WD-40 available for sale in the five gold store. The procedure is as follows: first single use WD-40 sprayed into the bearing, power the fan for several minutes, dissolve the solid dirt in the bearing, and then use a clean absorbent paper to suck out the oil stains in the bearing. Then add the special lubricating oil of your formula. Pack your fan in good status, haha. Note: This formula can be used for small fans. for heavy-duty large fans, you can add more motor oil to increase viscosity. In fact, it is easy to obtain various components. Japanese oil, grocery stores, or specialized stores that sell industrial sewing machines can be sold. WD - 40 , five gold stores are worth selling. It is not necessary to use Mobil 1, a good car oil, where it can be sold. If your company has a car and a driver, ask him if he wants something new.