Which winter car maintenance knowledge is more important? Should low viscosity engine oil be changed in cold weather?

Hello, first of all, seasonal maintenance

Cars are as reasonable as people, and corresponding measures should be taken in the cold winter.

First of all, winter preparation:

1. Before entering winter, it should be maintained once. The main purpose is to carry out preventive maintenance in addition to the necessary routine maintenance. The main projects are:

(1) To change the engine oil, change the engine oil of the corresponding brand according to the local minimum temperature. At present, domestic brands and foreign brands are mixed in the market, and the space is limited, so I won't introduce them here. The purpose is to keep the viscosity of engine oil constant (relative) at low and high ambient temperatures. On the one hand, it can make the engine of the car have lower resistance when starting and maintain a higher starting speed. On the other hand, it has better lubrication effect at low temperature. Third, the oil should have normal viscosity and normal fluidity under the normal temperature of the automobile engine, which is the most basic requirement for the oil to be changed. For the same purpose, the rear axle of the automobile "drives the gearbox and reducer", and the gearbox and other places that need lubrication should be replaced in time to adapt to the influence of increased viscosity, poor lubrication and increased resistance of lubricating oil on the automobile in winter.

⑵ Check and replace the coolant, and replace the corresponding coolant according to the local climate conditions to ensure that it does not freeze at the local minimum temperature. It should be noted that water expands below MINUS 4 degrees after freezing. It is not uncommon for the engine to freeze and crack in winter, so be careful. There are a lot of fake antifreeze now, so be careful. Remember the manufacturer and keep the evidence. In the event of freezing injury, huge losses are inevitable.

(3) Maintain its motive and battery to ensure the necessary starting speed. If it is necessary to repair the starter in advance, don't think about repairing the starter when there is no money to start. Of course, in the end, it is necessary to determine according to the use of your car and repair the starting battery. In cold winter, due to the characteristics of the starting battery, its power can be reduced by at least half, which greatly affects the starting speed and running time of the car and directly reflects the starting performance of the car. As for how to maintain a professional, I won't say it here. The most important thing is to adjust the electro-hydraulic ratio of the car battery to not less than 1.29. To ensure that the battery itself will not freeze. Check the spark plug, adjust the gap and replace it if necessary.

(4) If the car is carburetor type, it is best to maintain it, dredge the oil-gas passage, ensure a good oil-gas mixing ratio, and the starting device should be good and effective. For example, the choke valve should be good and easy to operate, and the automatic inspection should be flexible and effective, because this relationship has good starting performance in winter and cannot be ignored. Also check the air filter, which is very important for starting the oil-gas mixture ratio. The main content of EFI is to adjust the service time and clean the throttle assembly, low temperature enrichment device and air flow sensor, which have great influence on the engine, especially on the starting performance. The diesel engine should be replaced with corresponding low-temperature diesel oil, and the diesel circuit should be overhauled.

5] The maintenance of the chassis requires replacing the lubricating oil of the walking part, and replacing the appropriate lubricating oil with higher temperature, instead of replacing the low-quality calcium-based grease. Check the brake oil, because the temperature has an important influence on the brake oil, causing viscosity change, which affects the performance of the brake.

2. Winter begins

Don't start in a hurry. First detour from the left front of the car to the right side and then return to the left front door to make a surface inspection of the whole car. The main items are: visual inspection, tire pressure, accessories and chassis for external abnormalities. Then, open the door, open the front cover, check whether the oil quantity and engine surface are abnormal, and then prepare to start. When starting, you must step on the clutch pedal to separate the gearbox from the engine and reduce the engine load. Gently step on the accelerator pedal several times to start the oil on the accelerator pump, close the air door and start the motor. After you start, don't slam on the accelerator, and don't adjust the speed too low. Keep the medium speed slightly lower, keep running and pre-start.

Warm up the engine, gradually open the air door during the warm-up process, and observe the instruments such as engine oil. In winter, the viscosity of engine oil is high, which makes the pressure of engine oil rise instantly and damages parts and seals. This is very dangerous. Be sure to pay attention to the oil pressure when starting, and solve any abnormality in time.

(2) Pay attention to open the door a little, so as to avoid the fog making the front block invisible, and don't turn on the warm air before the temperature comes up, so as to avoid the engine preheating time is too long.

(3) Check whether all kinds of light signals and brakes are effective, start from the lowest gear and gradually accelerate, so that the car has an adaptation process.

(4) In addition to the above points, the EFI truck should first step on the accelerator pedal and then release it, so that the engine can be restored to the original starting state, that is, the cold start state, and the starting enrichment device can work. Preheating is automatic, and it can be started slowly with a little preheating, which saves fuel and does not affect the start-up, but the principle of slow start-up should be followed. Winter maintenance is to pay attention to cleaning the throttle, because it is easy to get greasy and lose flexibility and accuracy.

5] Some cars have high temperature in summer, so the thermostat has been removed and must be installed in winter. Of course, it doesn't have to be installed in individual vehicles using general cooling water, but heat preservation measures should be taken to avoid freezing the water tank.