What kind of engine oil does the Regal require?
3 Answers
Mobil is the original equipment manufacturer (OEM) engine oil for the Buick Regal. The recommended oil specification is 5W40, and it is advisable to use fully synthetic oil. The viscosity of engine oil changes with temperature variations, so special attention should be paid to its performance under both low and high-temperature conditions. For example, in 5W-30 oil, the first number indicates low-temperature fluidity. 5W means it can withstand temperatures as low as -30°C. The smaller this number, the better the low-temperature fluidity, resulting in smoother cold starts for the vehicle. The second number represents the oil's kinematic viscosity at 100°C. A higher value indicates better ability to maintain viscosity under high temperatures, which can also be understood as better lubrication performance under high-temperature conditions. The method for changing the engine oil in a Buick Regal is as follows: Wait for the engine temperature to cool down, allowing the oil to drain back into the oil pan. Use a wrench to loosen the oil drain plug and place an oil pan underneath to catch the old oil until it stops flowing. Start the engine and let it run for 30 seconds to allow the oil in the main oil gallery to drain out. Use a specialized wrench to remove the oil filter. Apply a small amount of new oil to the gasket of the new oil filter and hand-tighten it clockwise. Add the new engine oil through the oil filler cap on the engine valve cover. Typically, about three-quarters of a standard oil container is sufficient. Start the engine and let it run for 5 minutes, then check for any leaks around the oil drain plug and oil filter. If leaks are found, repairs should be made. After stopping the engine, pull out the dipstick to check that the oil level is within the standard range.
I've been driving a Buick Regal for several years, and choosing the right engine oil is something to be careful about. The official manual usually recommends using 5W-30 full synthetic oil. Why? The Regal's engine is designed with precision, and synthetic oil maintains stable performance at high temperatures while reducing wear, making long-distance driving more reliable. My neighbor owns an auto repair shop and often reminds me to check the oil level regularly to avoid issues like low oil or excessive impurities affecting engine life. The oil change interval should be kept between 5,000 to 8,000 kilometers—too long and carbon buildup becomes a risk. The model year also matters: newer Regals can use lower-viscosity oil, while older models might tolerate higher viscosity better. Maintenance shops often push universal oils, but I recommend sticking with big brands like Mobil or Shell for more reliable quality. Finally, don’t cheap out on low-quality oil—engine repairs cost way more in the long run.
When maintaining my Buick Regal, engine oil is the top priority. The owner's manual clearly specifies using 5W-30 full synthetic oil, a standard that General Motors emphasizes to ensure lubrication and thermal stability. I always check the dipstick before each oil change - if the oil color changes or has a burnt smell, it's time for an immediate replacement. The mechanic once told me that regular maintenance saves much more money than emergency repairs, and changing it every 10,000 kilometers is just right. Regarding oil selection, synthetic oil prevents oxidation and extends engine life. For daily commuters like me, the car runs much smoother. Also worth mentioning: in hot weather, oil with too high viscosity may cause startup hesitation, so don't randomly use other grades. It's best to follow the manual or get it tested at a professional shop.
