Why isn’t all lubricant oil the same in function?
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There is always friction between two lubricated surfaces, the lubricants job is designed to minimise that friction as much as possible, but it is always there.
How well a lubricant performs compared to others is determined by its properties and how they are influenced by external forces such as heat, pressure, moisture, mating surfaces etc.
This is why an engine oil designed for warmer climates can result in engine failure when used in cold climates and vice versa.
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