The Difference Between 5W and 10W Motor Oil

1 Answers
FaithAnn
07/29/25 4:46pm
5W motor oil and 10W motor oil differ in their fluidity at low temperatures. 5W oil has better fluidity at low temperatures compared to 10W oil. The number following the 'W' in motor oil grading indicates its viscosity specification. The smaller the number before the 'W', the better the oil's low-temperature fluidity, meaning it can be used in lower environmental temperatures and provides better engine protection during cold starts. Below is an introduction to several types of motor oil: 1. Mineral Oil: Mineral oil is the residue left after gasoline and heavy oil are extracted from petroleum. Although it is a natural oil, it contains more impurities. It is cheaper compared to semi-synthetic and full-synthetic oils but offers poorer lubrication for the engine and has a shorter service life. 2. Semi-Synthetic Oil: Semi-synthetic oil falls between mineral oil and full-synthetic oil. It contains a large amount of anti-corrosion additives to enhance the oil's stability and oxidation resistance. 3. Full-Synthetic Oil: Among these three types, full-synthetic oil is the highest in quality and durability, and it is also the most expensive. Typically, it can be used in passenger cars for 10,000 to 12,000 kilometers without deteriorating.
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