Why warm up the car before driving? Do you still need a hot car in hot weather?

The correct way to warm up the car should be to go on the road 30 seconds after starting to 1 minute. But don't drive at high speed at this time, keep low speed, and the engine speed should not exceed 3000~3500 rpm. Generally keep 2000 rpm. Otherwise, the severe wear and tear suffered by the engine and gearbox is irreparable. After the engine temperature rises to the normal working temperature, the "personal habit" driving mode can be restored.

Hot cars are needed in summer and winter, and the preheating time in winter is longer than that in summer. After a night's rest, the lubricating oil on each friction surface has basically disappeared, losing the oil film protection; Low temperature increases the viscosity of lubricating oil, deteriorates its adhesiveness and fluidity, and increases the resistance when the engine starts. Driving at this time will increase the load of the engine and increase unnecessary wear. The research of authoritative organization shows that the wear of engine during cold start accounts for about half of the total wear. Normal idle warm-up can reduce this wear and thus prolong the service life of the engine. At low temperature, metals will show low elasticity and wear resistance. Only under the normal working temperature can the engine reach the normal fit clearance and keep the best working condition.