Are Korean Cars Suitable for 5W40 Engine Oil?

1 Answers
StGiselle
07/30/25 10:20am
Korean cars are not suitable for 5W40 engine oil. Below are the reasons why 5W40 oil is not recommended for Korean cars and an introduction to the functions of engine oil: High viscosity of 5W40 oil: Korean cars' engines do not operate at high RPMs, and their working temperatures are relatively low, so there is no need to use engine oil with such high viscosity. If the oil viscosity is too high, it will increase the resistance during engine operation, leading to reduced engine performance and increased fuel consumption. Functions of engine oil: Engine oil is referred to as the lifeblood of the engine. It serves multiple purposes within the engine, including lubrication, cleaning, sealing, heat dissipation, cushioning, and rust prevention. Without engine oil, the engine would not be able to function properly.
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