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Question 8270

Is it advisable to use a lubricating oil with such a low viscosity index that it becomes excessively fluid when the engine heats up?

  1. Only if the engine overheats, since it lubricates better and helps lower its temperature.
  2. Yes; the more fluid it is, the better it lubricates, and it also carries away residues deposited in the engine.
  3. No, because the oil does not properly lubricate the engine parts.
Show answer and explanation

Correct answer: No, because the oil does not properly lubricate the engine parts.

No. Oil gets thinner as it heats up. If it becomes too thin to maintain a thin film between the parts, they rub against each other, wear down, and can cause the engine to seize. Oil that is too thin does not lubricate better or help cool an overheated engine.

Manual VIII. Mecánica y entretenimiento simple del automóvil