What type of oil should be used for the Cavalier 320?
2 Answers
The factory-recommended oil specification for the Cavalier is 5W-30 mineral oil. Engine oil is a critical factor affecting engine performance and service life. The Cavalier comes pre-filled with high-quality multi-viscosity oil at the factory, which can be used year-round except in extremely cold climates. Below are the primary functions of engine oil: Lubrication and wear reduction: There is rapid relative sliding between pistons and cylinders, as well as between crankshafts and bearing shells. To prevent excessive wear on components, an oil film must be established between these sliding surfaces. A sufficiently thick oil film separates the surfaces of relatively sliding parts, thereby reducing wear. Cooling: Engine oil carries heat back to the oil pan, where it is then dissipated into the air, assisting the radiator in cooling the engine. High-quality oil can transport carbon deposits, sludge, and worn metal particles from engine components back to the oil pan through circulation. The flow of lubricating oil also helps to clean contaminants generated on the surfaces of working parts.
For the oil selection of the Cavalier 320, I recommend referring to the owner's manual first. Chevrolet models typically recommend 5W-30 or 0W-20 full synthetic oil, preferably with API SN or higher standards. This type of oil has good fluidity at low temperatures for quick starts and maintains stable viscosity at high temperatures to protect engine components like pistons and bearings. Although full synthetic oil is more expensive, it has a longer replacement interval of 8,000-10,000 km, making it cost-effective in the long run. I've seen many owners use reliable brands like Mobil or Shell. If you frequently drive in congested urban areas, the oil can help reduce carbon buildup; during high-speed driving, ensure the viscosity is appropriate to avoid wear. Regularly checking the dipstick and replacing the oil filter is also crucial—don't wait until the oil turns black to change it. In short, the right oil extends engine life and enhances driving smoothness.
