Is 0w20 Oil Mandatory for Mazda?

[StJohn]

Mazda does not necessarily require the use of 0w20 oil; other oil grades can also be used. 0W-20 is typically only blended with synthetic or Group III base oils and can be used in both winter and summer. Here are several methods for selecting engine oil: Hand-Rubbing Method: Rub the lubricating oil repeatedly between your thumb and index finger. High-quality lubricating oil should feel smooth, produce minimal residue, and show no signs of friction. If you feel significant friction, such as sand-like particles between your fingers, it indicates the oil contains many impurities and should be replaced. Light Inspection Method: On a clear day, use a screwdriver to lift the oil at a 45-degree angle to the horizontal plane. Observe the oil droplets under sunlight. If no wear particles are visible, the oil is in good condition and can continue to be used. If excessive wear particles are present, the oil should be replaced. Oil Stain Method: Take a clean white filter paper and drop a few drops of oil onto it. After the oil has seeped through, if black powder appears on the surface and feels rough to the touch, it indicates the oil contains many impurities. Good oil will leave no powder, feel dry and smooth to the touch, and leave a yellow stain.