If your truck has an automatic transmission, checking the oil level is usually done:

While the engine is idling.. Section 2.1: Automatic transmission fluid is typically checked with the engine idling (consult vehicle manual).

If your truck has an automatic transmission, checking the oil level is usually done:

ANSWER BREAKDOWN
  • A. Correct. Automatic transmission fluid is typically checked with the engine idling (consult vehicle manual).
  • B. Incorrect. "With the engine off." is not correct. Automatic transmission fluid is typically checked with the engine idling (consult vehicle manual).
  • C. Incorrect. "While driving." is not correct. Automatic transmission fluid is typically checked with the engine idling (consult vehicle manual).
  • D. Incorrect. "Only when cold." is not correct. Automatic transmission fluid is typically checked with the engine idling (consult vehicle manual).