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Heavy Duty Equipment Technician Red Seal Exam Prep · Question

A heavy-duty truck operating in a dusty gravel pit accumulates 500 engine operating hours. The manufacturer's recommended engine oil and filter change interval for normal use is 250 hours or 6 months, whichever comes first. For severe service conditions, the interval is reduced by 50%. What is the appropriate interval for the next oil and filter change?

For severe service conditions, the normal interval is reduced by 50%. A normal interval of 250 hours is reduced by 50% to 125 hours, and 6 months is reduced to

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Question: A heavy-duty truck operating in a dusty gravel pit accumulates 500 engine operating hours. The manufacturer's recommended engine oil and filter change interval for normal use is 250 hours or 6 months, whichever comes first. For severe service conditions, the interval is reduced by 50%. What is the appropriate interval for the next oil and filter change?

Answer options: ✅ Every 125 hours or 3 months

  • Every 250 hours or 6 months
  • Every 500 hours or 12 months
  • Every 750 hours or 18 months

Correct answer: Every 125 hours or 3 months

Explanation: For severe service conditions, the normal interval is reduced by 50%. A normal interval of 250 hours is reduced by 50% to 125 hours, and 6 months is reduced to 3 months. Therefore, the appropriate interval is every 125 hours or 3 months.

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