Practice question

A school bus diesel oil cooler is suspected of leaking internally. Which symptom would BEST support that diagnosis?

  1. A blown headlight
  2. Engine oil and coolant cross-contamination (oil in coolant or coolant in oil) without combustion gases present
  3. A worn tire
  4. A noisy door hinge

Answer: B — Engine oil and coolant cross-contamination (oil in coolant or coolant in oil) without combustion gases present

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