PMMI Mechanical Practice Test 2025 – 400 Free Practice Questions to Pass the Exam

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What is an advantage of using synthetic oil over conventional oil?

It is cheaper than conventional oil

It requires more frequent changes

It has a longer oil change interval

The advantage of using synthetic oil over conventional oil is that it has a longer oil change interval. Synthetic oils are formulated to provide better performance and protection under a wider range of temperatures and conditions. This means that they maintain their protective properties longer than conventional oils, which can break down more quickly due to heat and stress during engine operation.

Because of their enhanced stability and resistance to oxidation, synthetic oils can often go longer between changes, reducing the frequency and costs associated with oil changes. This extended oil change interval is a key reason for the growing preference for synthetic oils among vehicle owners and mechanics, as it promotes better engine health and performance over time.

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It is thicker in consistency

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