If you don't want to go to a 4S店 for your car's 20,000-mile maintenance, you can choose to go to an outside repair shop. In fact, the maintenance items in a repair shop are almost the same as those in a 4S店, but the price is about two-thirds cheaper.

There are many maintenance items that need to be done when a car has traveled 20,000 miles, including replacing oil, oil filter, air filter, and checking the brakes, tires, engine, and transmission.

If your car's engine oil has worn out a lot, you can replace it yourself. If you feel that the cooling effect of your air conditioning has become worse, you can also replace the air filter yourself. Generally, there are three places for the air filter in most cars on the market, including the glove box of the passenger seat, the central panel, and the engine compartment.

According to the type of car, the oil and air filter used will also vary.

There are pros and cons to having your car serviced at an outside repair shop. The biggest advantage is that the price is much cheaper than that of a 4S店, saving you about two-thirds of the cost. However, the disadvantage is that the quality of the parts cannot be guaranteed. If you encounter a bad shop, your car may encounter quality issues after the maintenance, causing unnecessary trouble.