What kind of engine oil should be used for Buick Regal maintenance?

[DeJake]

For the Buick Regal's engine oil, fully synthetic oil is the best choice. Brands such as Shell, Castrol, and Mobil are recommended. The Regal uses engine oil with a viscosity grade of 5W30, which is suitable for all seasons. During maintenance, the Regal typically requires about 4L of engine oil, which is the standard size available in the market. It's important to note that neither overfilling nor underfilling the engine oil is advisable. Additional relevant information is as follows: 1. Engine Oil Quantity: Both excessive and insufficient engine oil can adversely affect engine performance. Too much oil can increase engine load, reducing power output. Over time, it can also damage the engine's exhaust ventilation system, increase carbon deposits, and create the illusion of oil burning. Insufficient oil, on the other hand, can impair the overall lubrication of the engine, particularly for components lubricated by crankshaft splash, leading to increased wear or even damage. 2. Engine Type: Naturally aspirated engines have lower requirements for engine oil and can use mineral or semi-synthetic oils. If the consumer's budget allows, fully synthetic oil can also be used. Compared to naturally aspirated engines, turbocharged engines have more precise internal components and operate under harsher conditions, requiring higher-performance engine oil with better fluidity. Fully synthetic oil is the best choice for turbocharged engines.