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In general, there is a significant difference in chassis structure among different price levels of car models, and you get what you pay for. Accustomed to the chassis of 100000 level car models, this time let's take a look at the chassis structure of a car that was once priced at 400000 level. What are the special features of its chassis structure! Two days ago, a 2019 facelifted BMW 525Li arrived at the store. The new car was priced at over 400000 yuan at the time. The driver said that during engine maintenance a few days ago, they found that one of the radiator pipes of the turbocharger was leaking antifreeze and needed to be replaced with a new pipe. It has now been replaced and is located below the orange arrow in the following picture. The master took out the old water pipe that had been replaced and showed it to me, as shown in the picture below. The left part of this pipe is made of rubber and plastic material, and the right part is made of metal material. The location where the antifreeze leaked is their joint point, with a lot of antifreeze scale. The master said that this type of water pipe can also be repaired, but the difficulty is relatively high and there are certain risks. It is better to replace the water pipe with a new one. After replacing the water pipe, the master lifted the car and observed the water pipe from the bottom. At this point, the protective plates at the bottom of the engine and gearbox had been removed. As shown in the picture below, aluminum alloy material was everywhere. The front suspension is a double wishbone independent suspension, both made of aluminum alloy material. The master said that for models in this price range, the majority of chassis materials are aluminum alloy. The steering knuckle is made of aluminum alloy material, and the two support arms connected at the lower part are similar to the fork arms connected at the upper part, so this type of suspension is also called a double fork arm. Audi and Mercedes Benz in the same price range are basically constructed in this way. Looking at the rear, the rear wheels are the driving wheels, and the differential is installed on the subframe. It is a five link independent suspension type, of which four are made of steel and the top one is made of aluminum alloy. Looking at the rear subframe, it is made of all aluminum alloy material, which looks quite thick. As shown in the figure below, this is a removed lower protective plate made of aluminum alloy, which protects the lower part of the bumper from the engine position. This smaller guard plate is installed under the engine, with the plastic guard plate in the middle facing the oil drain screw position of the engine. These two original car protective panels are quite thick, which to some extent reduces the weight of the entire vehicle. After installing the protective plate, as shown in the figure below, we can see that the protection of the protective plate is quite comprehensive, and the overall chassis is ...

Approaching noon, I entered the store with a Buick Verano, a 2015 three box 15S automatic drive model. The owner purchased it in 2016 and it has been a full 10 years since then, but the total mileage is not much, just 40000 kilometers, averaging only about 4000 kilometers per year. The car owner said he doesn't usually drive very much, and after this maintenance, he will have to leave it at home for at least half a month before driving again. This time, we will take photos taken during the inspection by the master to see what the condition of this car, which has been around for 40000 kilometers for 10 years, looks like. Open the engine hood, the overall condition is good. The technician pulled out the oil dipstick to measure, and the oil level was at the middle scale, which is considered normal. As for brake fluid and antifreeze, the car owner himself understands the car and says he doesn't care for them temporarily. Lift up the car. The original car had a plastic protective plate, which was not fully protected. The owner installed an iron protective plate themselves, and reserved holes for the oil drain screw and oil filter. The car owner said that the car was already priced at 150000 yuan when it landed, and now it's not very valuable. The master said that the prices of joint venture cars ten years ago were indeed not cheap, but the materials used were decent. Look at the subframe, which is made of aluminum alloy material. The car owner said that the chassis has not been touched and is basically in its original state, with only two front tires replaced. Check the front suspension, the front steering knuckle is also made of aluminum alloy material, and there are no problems with the lower arm ball joint, tie rod ball joint, small connecting rod, and shock absorber. Looking at the middle part of the chassis, it is very in line with the style of American cars, quite bold, without protective plates. The owner said that the chassis armor was sprayed after buying the car. Looking at the rear suspension, the torsion beam non independent suspension with Watt linkage was checked for the status of all components and there were no issues. The master said that the two rear tires are still the original car tires, and the number 1316 indicated by the arrow indicates that they were produced in the 13th week of 2016, a full 10 years ago, with many side aging cracks. The tread pattern is still very obvious, as shown in the following picture, and the grooves are relatively deep. The master said that the depth of the tire pattern is closely related to the mileage. The mileage of the car is only 40000 kilometers, but due to the long time, it is still recommended that the owner replace it. When checking the tires, the owner asked why the tire pressure is so high now? The master said that the reason for thermal expansion and contraction is that when the temperature is high, the air pressure inside the tire will naturally increase. I can let it go for you. The above ...

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