Practice question

What is a key difference between mineral, semi-synthetic and fully synthetic engine oils?

  1. They are refined and formulated differently, generally trading off cost against performance and stability across temperature ranges
  2. Only fully synthetic oil can lubricate an engine; the others provide no lubrication
  3. Mineral oil is illegal to use in motorcycles
  4. Semi-synthetic oil is always more expensive than fully synthetic oil

Answer: A — They are refined and formulated differently, generally trading off cost against performance and stability across temperature ranges

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