Question

1. two technicians are discussing which oil to use for an oil change. technician a says that if a cars oil cap calls for 5w - 20 a 0w - 20 engine oil may be used. technician b says that if 5w - 30 is used in a car that is designed for 5w - 20 the check engine light may come on. who is correct?

a. technician a
b. technician b
c. both technicians
d. neither technician

1. which oil has a lower viscosity when the engine is at operating temperature?

a. 0w20
b. 5w30
c. 10w30
d. 5w40

1. which oil has the highest viscosity when the engine is cold?

a. 0w30
b. 5w30
c. 10w30
d. 15w40

1. all of the following are organizations that issues standards for engine oil except.

a. sae
b. api
c. acea
d. ase
section two: short response

1. the latest engine oil standard set by api is api - sm
2. what is the standard of oil used for gm vehicles? synthetic oil
3. what is the european oil standard for gdi engines? acea a4
4. what does the first number with a w mean when looking at sae oil specifications?
5. the gm standard for engine oil and coolant is called __________.

section three: true or false - indicate with a t if the statement is true or an f if the statement is false.

1. most manufacturers allow a longer oil change interval if a synthetic oil is used.
2. general motors has its own standards for engine oil in gm vehicles.
3. the climate and season may dictate the viscosity of oil you should use.
4. synthetic oil cannot be mixed with conventional oil.
5. a primary advantage of synthetic oil is better cold flow

Explanation:

1. Using a different - viscosity oil than recommended can cause issues like the check - engine light coming on. Technician B is correct.
2. Lower numbers in the oil - viscosity grade mean lower viscosity at operating temperature. 0w20 has a lower viscosity.
3. The first number before 'W' indicates cold - temperature viscosity. Higher the number, higher the cold - temperature viscosity. 15w40 has the highest cold - temperature viscosity.
4. SAE, API, and ACEA set engine - oil standards, while ASE is for automotive technician certification.
5. API - SM is not the latest API engine - oil standard.
6. GM vehicles often use synthetic oil as a standard, but it's more complex in reality with specific GM - approved oils.
7. ACEA A4 is a European oil standard for some engines including GDI.
8. The first number with 'W' in SAE oil specifications indicates the oil's viscosity at low temperatures.
9. GM has its own standards for engine oil and coolant.
10. True. Synthetic oil generally allows for longer oil - change intervals.
11. True. GM has specific standards for engine oil in its vehicles.
12. True. Climate and season affect the required oil viscosity.
13. False. In some cases, synthetic and conventional oil can be mixed, but it's not ideal.
14. True. Synthetic oil has better cold - flow properties.

Answer:

1. b. Technician B
2. a. 0w20
3. d. 15w40
4. d. ASE
5. False
6. Synthetic oil (but more complex in reality)
7. ACEA A4
8. Oil's viscosity at low temperatures
9. GM - specific standards
10. T
11. T
12. T
13. F
14. T