Quiz #03: Engine Oil Selection

1. What does the API "S" classification in engine oils stand for?
A) Diesel engines
B) Gasoline engines
C) Hybrid engines
D) Two-stroke engines

2. What does the ACEA "C" classification indicate about engine oil?
A) High performance in petrol engines
B) Compatibility with after-treatment devices
C) Suited for high-mileage engines
D) Low ash content

3. What is the primary role of detergents in engine oil additives?
A) Reduce friction
B) Clean engine components by preventing deposits
C) Enhance viscosity
D) Improve fuel economy

4. Which viscosity grade would be most appropriate for an engine operating in a very cold environment?
A) 20W-50
B) 10W-40
C) 0W-20
D) 15W-40

5. What is the purpose of anti-wear additives in engine oil?
A) To reduce sludge formation
B) To improve oxidation stability
C) To form a protective layer on metal surfaces
D) To prevent oil foaming

6. What does a higher Total Base Number (TBN) in engine oil indicate?
A) Better fuel economy
B) Greater ability to neutralize acids
C) Lower oil consumption
D) Higher resistance to oxidation

7. Which type of engine oil is most suitable for high-performance engines operating under severe conditions?
A) Mineral oil
B) Synthetic oil
C) Semi-synthetic oil
D) Re-refined oil

8. What does the "W" in an engine oil's viscosity rating (e.g., 5W-30) stand for?
A) Weight
B) Winter
C) Water resistance
D) Wear protection

9. Which engine oil classification is designed specifically for older, high-mileage engines?
A) API SJ
B) API SN
C) API SP
D) API SM

10. Why are friction modifiers added to engine oils?
A) To increase viscosity
B) To enhance wear protection
C) To reduce internal friction for better fuel economy
D) To prevent oil oxidation