What type of engine oil is suitable for the Regal?
2 Answers
The Regal uses 5W30 engine oil. Compared to 5W40 and 5W30, the low-temperature fluidity performance is the same, but the difference lies in the high-temperature performance. 5W40 has higher viscosity, providing better high-temperature protection and sealing performance. However, the increased viscosity results in greater engine running resistance and higher fuel consumption. For the Regal engine, 5W30 engine oil is more suitable. 1. Different Models For the Regal, depending on the vehicle configuration, the factory-fill engine oil is either dexos™ engine oil or engine oil that meets GM6094M or GM4718M standards. When changing the engine oil, if the engine oil filler cap has a dexos logo, it is recommended to use engine oil with the dexos™ certification mark. The Regal is suitable for engine oil identified by the dexos™ certification mark. Look for and use engine oil that displays the dexos™ certification mark with the correct viscosity grade, or engine oil that meets General Motors GM6094M standard and is certified by the American Petroleum Institute (API), with a viscosity grade of SAE5W-30. For vehicles equipped with a Turbo engine, use engine oil that meets General Motors GM4718M standard and is certified by the American Petroleum Institute (API), with a viscosity grade of SAE5W-30. 2. Different Engines Naturally aspirated engines have lower requirements for engine oil and can use mineral oil or semi-synthetic oil. If the consumer's budget allows, fully synthetic oil can be used. Compared to naturally aspirated engines, turbocharged engines have a more compact structure and operate in more complex conditions, requiring higher-quality engine oil with better fluidity. It is best to use fully synthetic oil.
As someone who frequently maintains vehicles, I believe the choice of engine oil for the Buick Regal should follow the manual's recommendations. Generally, the Buick Regal requires synthetic oil with dexos certification, commonly with viscosities of 5W-30 or 0W-20, depending on the model year. Older models may use 5W-30, while newer models post-2018 tend to favor 0W-20 to improve fuel efficiency and cold-start performance. Opting for full synthetic oils, such as Mobil 1 or Shell's Ultra series, offers numerous benefits—reducing engine wear, extending service life, and minimizing carbon buildup, especially in city traffic. Avoid randomly selecting viscosity; higher viscosity increases fuel consumption, while lower viscosity may lead to insufficient lubrication. Oil changes are recommended every 5,000 to 8,000 kilometers, adjusted based on driving conditions. In regions with significant seasonal temperature variations, using lower viscosity oil in winter provides better protection. Don’t forget to replace the oil filter simultaneously to ensure the overall health of the lubrication system.
