How often does Buick LaCrosse clean the throttle?

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Buick LaCrosse cleans the throttle every 20,000 kilometers. Throttle is a controllable valve that controls air to enter the engine. There are two types: traditional cable type and electronic throttle. After the gas enters the intake pipe, it will be mixed with gasoline to form a combustible mixture, which will be burned to do work. It connects the air filter at the top and the engine cylinder at the bottom, and is called the throat of the automobile engine. Take the LaCrosse 202 1 552T luxury model as an example: it is a medium-sized 4-door 5-seat car with a 9-speed automatic manual transmission, with a top speed of 205km, a length, width and height of 5026mm, 1866mm and 1459mm respectively, a wheelbase of 2905mm and a fuel tank volume of 55L.