Transmission is an important component in vehicle movement. Without the transmission, more unnecessary stress will be imposed on the vehicle engine. Why Need Transmission (Gearing) System This was because more torque is required when the vehicle at standstill, thus require high torque gearing. While, during vehicle movement, less torque is needed, thus less torque require, On the other hand, during high-speed movement, the higher gear ratio is needed (less rpm to the engine) to reduce stress to the engine. While, at a lower speed, low gear ratio (high rpm engine) to cater to high torque requirement. How Often Need to Service? In the case of my Mercedes W203 C180K, it got 5-speed auto transmission with a 722.6 series transmission system. Mercedes auto transmission requires a 40000 km service interval of changing gearbox oil and filter. Total auto transmission oil capacity in W203 C180K is 8 liter with a service interval of 80000 km. However, during auto oil replacement, o
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