The new car just bought is mainly based on the maintenance cycle recommended by the maintenance manual, the quality warranty period has come out, and the car that has replaced the oil itself should decide the replacement cycle according to the type of oil used. It's easy to change the oil, and a little better oil won't go anywhere. Adding a little good oil doesn't cost much. However, sometimes car owners spend money to add good oil, but some repairmen exchange full synthetic oil for semi-synthetic oil, or for mineral oil. For repair workers, such a secondary charge is not harmful to cars that can increase profits. However, there is a problem without all the owners knowing. The original fully compound oil change cycle was about 10,000 km/12 months. If it is switched to mineral oil, the exchange period will be shortened to 5000 km/6 months. Therefore, the artificial replacement of the oil will be delayed, exceeding the oil life is easy to generate impurities, affecting the lubrication and wear reduction, cooling and heat dissipation assistance, sealing leakage, anti-corrosion and rust, cleaning and other effects of the effect, affecting the life of the car.
Second, the cost can not be replaced by a good mechanical filter, the oil filter is generally replaced every 5000-6000 km or half a year. The main role is the oil filter filters the impurities in the oil, keeping the oil clean, so that the oil can provide sufficient lubrication for the engine. If mineral oil or semi-synthetic oil is used, the filter machine can be changed by the time the oil is changed. If you use a fully synthetic oil, you need to change the machine twice, and the oil needs to be changed once. The role of the mechanical filter is very important, if it is not replaced for a long time, it will lose the role of the "filter" and worsen the wear of the engine. Oil filters are usually 10 to 100 yuan, and there are also mechanical filters of more than 200 yuan. Although many owners will be reluctant to spend money on a better mechanical filter, it is not willing to spend money to change a good mechanical filter. The owners said, "If I exchange the filter for 50 yuan, I am afraid to change the filter for 10 yuan." It's not that you're reluctant to spend money, it's that you can pay but you can't use things."
There is a difference between the good mechanical filter and the next mechanical filter in use, but it is difficult to see the difference in appearance, so many owners cannot judge what quality mechanical filter they use. Car owners can't tell the difference, let some maintenance personnel dig holes, charge one by one, simply do not directly replace the machine and filter, invisibly damage the car. Therefore, just in case, the best way is to buy a better mechanical filter online yourself and watch the repairman replace it. In that case, there will be almost no problems. Third, when the oil is not fully added for maintenance, the number of liters of oil added at a time varies depending on the type of engine. Generally, small displacement vehicles add 3.2 to 3.6 liters of oil each time they are repaired, and about 4.5 liters are added when the exhaust volume is large. From the workshop manual, you can see the amount of oil that needs to be added at one time.
The oil currently sold on the market, plastic bottles are usually divided into 1 liter, and large bottles are usually divided into 3.5L, 4L, 5L. Basically, a 3.5L bottle of oil for a small-displacement car is enough, and some large SUVs are enough for a 5L bottle of oil. If we use the oil of the repair shop and the 4S shop, it is possible to miss one pound or two pounds. One car saves 1 L of oil, five cars save a large bottle of oil. Doing so is a great way to save costs, but it's the owners who suffer. Faced with such a problem, we can choose to bring our own oil and pay the processing fee to the repair shop. The problem of not adding oil can be cleverly avoided. Fourth, without adding clean oil, adding new oil, now, many consumers are beginning to choose to maintain their own cars. Oil and triple filter are easy to buy and easy to install, but the only difficulty is to change the oil, if there is no professional tool, it is difficult to discharge the old oil. The market has demand, and naturally there are people who meet the demand, which produces the pump. Old oil can be removed directly with an oil pump. The oil pump was originally a tool for the owners to change the oil themselves, but for ease of use, some auto repair shops also began to use the oil pump. Using an oil pump is convenient, but not the same as direct refueling. Maintenance personnel can artificially control the amount of old oil left.
If the old oil is intentionally retained, it can be reduced when new oil is added, and for the repair shop, it can invisibly reduce the cost. For cars, it will affect the quality of the oil and affect the life of the car. Why don't you leave the car when you change the oil? When changing oil, you can't stay away from the car, mainly because the repair workers are afraid of charging and cutting corners next time, which will affect the life of the car. With the advent of the Internet era, the speed of information dissemination is getting faster and faster, and repair shops and 4S stores rarely obtain high profits by recharging and cutting corners. I can't be 100 percent sure that this won't happen again, but basically repair shops of a certain size, repair shops with a little professional style will work hard. I wouldn't damage my big reputation because of such a small failure. Recommended here to everyone, maintenance can go to the maintenance shop downstairs in the community. Such repair shops are completely word of mouth. Repair workers are people in the neighborhood, value reputation, and there are almost no maintenance problems.