What are the reasons for the decrease in power after the first maintenance of the Envision?

[Judah]

After the first maintenance of the Envision, the decrease in power may be due to the wrong viscosity of the selected engine oil or overfilling of the engine oil. Engine oil is known as the blood of the engine, as it plays roles in lubrication, cleaning, sealing, heat dissipation, buffering, and rust prevention within the engine. When adding engine oil, it is essential to ensure that the oil level is between the min and max marks on the dipstick. The Envision is equipped with Buick's eConnect 2.0 connectivity technology, supporting features such as SuperID personal accounts, remote upgrades, WeChat music and location sharing, cloud-based intelligent voice interaction, and fleet functions, providing consumers with a rich array of cloud applications.

[StephanieMarie]

As a car owner who frequently deals with repairs, I feel that the Envision's power drops after the first maintenance, and there are quite a few reasons for this. First is the engine oil issue—if the technician uses oil with too high viscosity during maintenance, the increased internal friction in the engine will naturally affect acceleration; too low viscosity is also problematic, as insufficient lubrication can cause component overload. Second, the ECU system resets after maintenance and relearns driving habits, but this process may temporarily reduce power, which typically recovers after driving a few hundred kilometers. Third, fuel system cleaning residue can clog the injectors, slightly lowering combustion efficiency. Fourth, an incorrectly installed or clogged air filter directly reduces air intake, affecting horsepower. Fifth, human errors like overfilling or underfilling oil can lead to abnormal oil pressure. I recommend first checking the oil dipstick to measure the oil level—if it exceeds the upper limit, drain some. If that doesn’t help, connect a diagnostic tool to read fault codes and check for sensor misreporting. Choosing the correct oil type during regular changes is crucial—don’t skimp by using non-genuine products.

[SanRosalie]

After all these years repairing cars, I've encountered many people complaining about reduced power after the first maintenance. Common factors include new engine oil not being properly broken in, resulting in increased resistance and a rough feeling during the first few hundred kilometers. Another possibility is the replacement of the filter with a cheaper one, where impurities block the oil passage and affect oil pumping. I remember a guy's Envision had slightly slower acceleration because the ECU reset and adaptive learning was slow, but it returned to normal after a couple of days of driving. Other situations include improper cleaning of spark plugs, leading to incorrect ignition timing, or mistakenly using the wrong type of transmission fluid, causing sluggish shifting. There are always minor adjustments after maintenance, but if the power issue persists for a long time, go to the 4S shop for a recheck—they can inspect oil pressure and computer data. Don't ignore safety; weak power at high speeds is dangerous. It's recommended to check the oil system every six months to prevent sudden issues.

[McAlaina]

After the oil change, the car feels sluggish. I suspect there might be issues with the maintenance details. For example, the oil grade might not match, and the 4S shop might have used high-viscosity oil by mistake. Or, after the ECU reset, it needs time to adapt, and the first tank of fuel might feel less responsive. Also, check the spark plugs or intake pipe, and clean them if there's too much dust. For daily driving, use diagnostic apps to monitor the engine RPM, which can help detect problems early.