What brand is the original engine oil for the Buick Regal?

1 Answers
LaAnna
07/29/25 1:23pm
Mobil is the original engine oil brand for the Buick Regal. The oil specification is 5W-40, and it is a fully synthetic oil. The viscosity of engine oil changes with temperature, so special attention must be paid to its performance under both low and high temperatures. For example, in 5W-30, 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, ensuring smoother cold starts for the car. The second number represents the kinematic viscosity of the oil at 100°C. A higher number indicates better viscosity retention at 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 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 passages to drain out; Use a specialized wrench to remove the oil filter; Apply oil to the gasket of the new oil filter and tighten it clockwise by hand; Add the new engine oil through the oil filler cap on the engine valve cover. Typically, about three-quarters of a bottle of oil is sufficient; Start the engine and let it run for 5 minutes, checking for any leaks around the 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.
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