🔍 Key Concepts

• Engine lubrication system requirements for diesel engines • Difference between fuel properties (like cetane number) and lubricating oil properties • Importance of oil temperature control for viscosity and film strength

💭 Think About

• Which option relates directly to how well the oil can form and maintain a lubricating film between moving parts during operation? • Which properties listed are mainly important for fuel performance rather than lubrication performance? • How does temperature affect an oil’s viscosity and its ability to flow and protect engine components?

✅ Before You Answer

• Identify which choices describe fuel characteristics rather than lubrication characteristics • Consider how oil viscosity changes with temperature and what the engine system must do to keep lubrication effective • Ask yourself which factor the engineer can actively control during operation to ensure proper lubrication