汽车设计者和生产厂家一般都要求使用者按说明书上的规定合理地使用汽车,以保证使用寿命。但实际情况并非如此,驾修人员在使用和修理汽车时,往往会有以下几个误区。1 部分驾修人员认为,在发动机起动前,冬天应该摇转曲轴发动机10～20转后再行起动,而夏天则没有这个必要。他们认为,冬天发动.机油粘稠,起动时机油不容易润滑到各运动摩擦副的表面;夏天发动机机油较稀,起动时机油容易到达各运动摩擦副表面。实际上,汽车 Car designers and manufacturers generally require users to use the car according to the instructions on the reasonable use of vehicles to ensure that the service life. However, the actual situation is not the case, the driver training and maintenance of vehicles often have the following errors. Some drivers think that before starting the engine, the crankshaft crankshaft should be cranked 10 to 20 rpm before starting in winter, and not necessary in summer. They think that the winter start. The oil viscosity, the start of the oil is not easy to lubricate the surface of the friction pair; the summer engine oil is rare, start the oil easily reach the surface of the sports friction. In fact, the car