The more viscous the oil, the more fuel it consumes?Xiaobian measured to help you solve your doubts

【The owner's family car knowledge】Recently, when Truth Man was on the forum, he found that a certain issue was discussed by netizens for a long time: the higher the oil viscosity, the more obvious the increase in fuel consumption, but the lower the engine noise. Although theoretically speaking, the use of high-viscosity oil in the engine will increase fuel consumption and noise will also change, but is there any significant difference in the actual situation as stated by netizens? It happens that the truth man has some brands of different viscosities on hand Engine oil, while the colleague is away, hand in his car key, so that you can have a real test. Without further ado, start immediately.

● A netizen appeared to say: After switching to high-viscosity oil, the car's fuel consumption increased and the noise changed

In the forum of a certain model of a certain brand, a netizen described the experience of "increasing fuel consumption" after switching to high-viscosity engine oil in his car:

In addition to fuel consumption, changes in engine noise are also a topic of discussion among netizens.

● What will Truth Man test this time?

How much does engine oil viscosity affect vehicle fuel consumption and engine noise? In order to see this gap clearly, Truthmaster found three different viscosity engine oils and a test car, and did a simple test.

● This test method and instrument tools

Test object: Truth Man reserves three types of engine oils with common viscosities of the same brand, namely 5W-30, 5W-40, and 5W-50. The car used by Truth Xia Shunlai is a Dongfeng Citroen New Sega, which has run for more than 10,000 kilometers, and the oil viscosity used is 5W-30, which is just right for the test car.

Test equipment: digital noise meter

Test method: We add the oil viscosity to the test vehicle in the order from low to high (5W-30→5W-40→5W-50), and replace the oil filter every time, as far as possible Reduce the residual amount of old engine oil.

After the car is warmed up, we drove the car to the gas station (in fact, the gas station is next to the oil change location), filled up the fuel tank (filled up to the extent that the oil level is visible), and then ran a circle according to the scheduled route and returned The gas station fills up the fuel tank again, and calculates the average fuel consumption value of the current test based on the fuel filling amount and the subtotal mileage. The noise test of the three engine oils is carried out in a fixed section of the road.