New car first maintenance trap

The first maintenance of a new car is usually free, mainly to replace the oil filter and check the condition of the car, but other items still need to be charged. The maintenance trap is that some stores will fool car owners into adding money for unnecessary maintenance and replacement. For example, the oil change was free, but some shops would persuade car owners to add money to replace the whole synthetic engine oil or clean up the carbon deposit in the accelerator, or to replace the air filter or air conditioning filter element at an extra charge. But in fact, when the car is newly insured, it usually doesn't run for a long time, and there are few problems such as serious carbon deposition, so there is no need to clean the throttle or replace the air conditioner filter, just take it out and clean it.