🔍 Key Concepts

• Use the legend at the bottom to identify which shading pattern corresponds to the ideal operating range (100–300 SUS) for each oil. • Carefully compare the temperature scale along the top (°F) with the synthetic oils row (Amsoil 10W40, All Proof 10W50, Mobil 1, DN 600). • Remember that the required governor oil temperature range 130°F to 205°F must fall entirely inside the ideal operating band for the oil you choose.

💭 Think About

• For each synthetic oil, between which temperatures does its ideal operating band (not just acceptable range) extend? • Which oil’s ideal band covers both 130°F and 205°F, without dropping into the limited‑operation or high‑temperature zones? • Are there any oils whose ideal band either starts above 130°F or ends below 205°F, making them unsuitable for the full required range?

✅ Before You Answer

• Verify the shading pattern: only use the section that matches the legend’s ‘Ideal Operating Range’ symbol when reading each oil’s temperature span. • Double‑check the temperature endpoints where the ideal band changes to limited or high‑temperature operation for each synthetic oil. • Confirm that your chosen oil is labeled as Synthetic Oil in the chart (not petroleum or automatic transmission fluid).