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What causes the difference in quality between engine oil brands?

Discussion in 'Physics' started by James Wilson, Oct 8, 2018.

  1. James Wilson

    James Wilson Guest

    I notie that different engine oil brands give poor or better performance even when using the oil has the same viscosity. What is the cause of this and why should you buy better known brands?

    Also when you use good brands e.g. shell, castrol sometimes your manual will specifically state 'use shell helix 5w30'. Would there be a reason why they would recommend using that over an equally good brand e.g. castrol 5w30 or whatever?

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