Multiple choice general knowledge

How do you know that, the engine oil needs a change?

  1. Car is not starting

  2. Gear is not changing

  3. Engine oil turned to thick black in color

  4. Car is giving extra noise

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

When engine oil degrades from use, it accumulates contaminants and oxidation products that turn it dark or thick black. This color change is a clear visual indicator that the oil has lost its effectiveness and needs replacement. While the other options (car not starting, gear issues, extra noise) can signal various problems, they are not specific indicators of oil condition.