Ruifeng s3 cold car shifts gears, and it will be fine if you don't upgrade to second gear in hot weather. Is this bad transmission oil?

The fault of gearbox is mainly due to the dirty valve body, which will destroy the quality and friction characteristics of gearbox oil. Increase friction and wear, at the same time, sludge will also be produced in the gearbox, which will cause the valve body and pipeline to be blocked and the oil pressure cannot be adjusted in sequence, thus causing gearbox failure.

In this way, the solution can be found by searching for "no disassembly and no repair to solve the gearbox fault", without any damage to the car, and the oil change cycle of the gearbox can be extended by 3-5 times, effectively controlling the oil temperature of the gearbox.