Using the oil chart provided in the...

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Question 1 of 2066636eef28f7522a1c520462

Using the oil chart provided in the illustration for guidance, which of the oils listed below would provide the best protection against high governor oil operating temperatures for speed control applications for fishing industry main propulsion diesel engines? Illustration MO-0161

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Question 1 of 20

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🔍 Key Concepts

• Study the temperature range bars for each synthetic oil on Illustration MO-0161, paying attention to how far each bar extends into the high‑temperature side. • Note the legend at the bottom showing where oil is in the ideal operating range versus limited operation at high temperature, and the recommended upper temperature limits for petroleum vs. synthetic oils. • Compare only the four listed answer oils (All Proof 10W50, DN600, Mobil 1, Delvac I) and focus on which one maintains an acceptable viscosity range furthest into the high‑temperature region.

💭 Think About

• Which of the four listed oils has its acceptable (shaded) operating band reaching the highest governor oil operating temperature on the chart? • Among the synthetics, do any of the oils remain in the ideal operating range at temperatures where others have already moved into the limited or upper‑limit region? • Does the chart show any difference between the oils that stop near the 200°F mark and those that continue toward the 250°F mark?

✅ Before You Answer

• Verify the right‑hand end of each oil’s bar on the temperature scale and note the maximum temperature each one reaches. • Check where each oil transitions from ideal operating range (dotted) to limited high‑temperature operation (cross‑hatched), and see which oil stays in the dotted region the longest. • Confirm you are comparing only the synthetic oils section of the chart and not the petroleum or automatic transmission fluid lines.

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