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 - __
2. what is the standard of oil used for gm vehicles? __
3. what is the european oil standard for gdi engines? __
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. 0w - 20 can be used instead of 5w - 20 as it has similar properties and using 5w - 30 doesn't directly cause the check - engine light to come on for this reason, so Technician A is correct.
2. The lower the number before 'w' and the number after 'w', the lower the viscosity at operating temperature. So 0w20 has the lowest viscosity among the options.
3. The higher the number before 'w', the higher the viscosity when the engine is cold. So 15w40 has the highest cold - viscosity.
4. SAE (Society of Automotive Engineers), API (American Petroleum Institute), and ACEA (European Automobile Manufacturers' Association) set engine - oil standards. ASE (Automotive Service Excellence) is for technician certification, not setting oil standards.
5. As of common knowledge, the latest API engine - oil standard may change over time, but a common one is API - SP.
6. GM has its own Dexos standards for engine oil.
7. For GDI engines in Europe, ACEA standards are relevant, such as ACEA C5 for some applications.
8. The first number with a 'W' in SAE oil specifications indicates the oil's viscosity at low temperatures (winter - grade viscosity).
9. GM's standard for engine oil and coolant is called Dexos.
10. True. Synthetic oils generally have better properties and allow for longer change intervals.
11. True. GM has its Dexos standards for engine oil in its vehicles.
12. True. In colder climates or seasons, a lower - viscosity oil may be needed for better cold - start performance.
13. False. Synthetic and conventional oils can be mixed, although it's not always recommended for best performance.
14. True. Synthetic oil has better cold - flow properties compared to conventional oil.

Answer:

1. a. Technician A
2. a. 0w20
3. d. 15w40
4. d. ASE
5. SP
6. Dexos
7. ACEA C5 (for example)
8. Viscosity at low temperatures (winter - grade viscosity)
9. Dexos
10. T
11. T
12. T
13. F
14. T