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Answers to the Oil Midterm Exam
I feel these were all difficult questions. You would be doing well to get 3 correct.
1- At normal operating temperature, 212 F, a straight 30 weight oil has a viscosity of how many centiStokes?
A- 3
B- 6
C- 10
D- 20
E- 30
The correct answer is C- 10 cS.
2- While racing at 95 F, mid-summer in Florida, which of these synthetic oils gives the best protection at 302 F oil temperature?
A- 0W-40
B- 5W-40
C- 10W-40
D- Straight 40 weight
E- They are all exactly the same
The correct answer is E- They are all exactly the same.
3- While starting up your car at 75 F, mid-winter in Florida, what is the approximate viscosity of a straight 10 (ten) weight motor oil?
A- 3 cS
B- 6 cS
C- 10 cS
D- 20 cS
E- 30 cS or higher
The correct answer is E- 30 cS or higher.
4- The biggest problem with mineral based motor oils with long tern use is:
A- Thinning
B- Thickening
C- Loss of VI (viscosity index) improvers
D- Both A and C
E- None of the above is correct
The correct answer is B- Thickening
5- Which of the following mineral based motor oils are still too thick at a 75 F startup temperature?
A- 20 weight
B- 10 weight
C- 5 weight
D- All of the above
E- None are too thick
The correct answer is D- All of the above
Motor Oil Final Examination
Answer questions without looking back. This is a closed book exam. Base your answers on the information provided in these past chapters.
1- While starting up your car at 75 F, mid-winter in Florida, which of these synthetic oils provides the least startup resistance, minimal battery and starter motor load?
A- 0W-20
B- 0W-30
C- 0W-40
D- 0W-50
E- They are all exactly the same
2- While vacationing in Orlando, it is 104 F mid-summer in Florida. The rental car company put a straight mineral based 30 weight oil in their car because they wanted the operating temperature viscosity to be at 10 cS. What will be the approximate viscosity of the oil when you start up your engine now? (Closest answer)
A- 10 cS
B- 20 cS
C- 30 cS
D- 100 cS
E- 400 cS
3- While vacationing in Florida you are able to race your car at the Sebring track. At an oil temperature of 302 F what is the approximate difference in viscosity between a 20 and 40 weight oil. (Pick the closest number)
A- 1
B- 10
C- 20
D- 40
E- 400
4- Assume there are no losses in the system and your oil pump is truly volume based. Also assume there is no cut off pressure valve and you are using a 40 weight motor oil. If at 1,000 RPM your pressure is 30 and your pump output is 1 (one), what will the pressure and output be at redline, 8,000 RPM?
A- 240 PSI, flow = 8
B- 180 PSI, flow = 8
C- 240 PSI, flow = 4
D- 180 PSI, flow = 4
E- 120 PSI, flow = 8
5- Water can be used as a lubricant.
A- True
B- False
6- If you increase the pressure in a bearing, all other things being constant, the force of separation between the parts increases.
A- True
B- False
7- The best weight oil for racing any Ferrari or Lamborghini is a 40 weight multigrade synthetic oil like Mobil One 0W-40.
A- True
B- False
8- For my Maranello 575 the 0W-20 weight Mobil 1 oil is actually too thick for my driving conditions.
A- True
B- False
9- The major problem with engine oil is that it thins with increasing temperature.
A- True
B- False
10- Your 1993 sports car manual states to use an API / SAE SH rated 10W-40 mineral based motor oil. Your engine has only 1,550 miles on the odometer. On your next oil change it would be better to use a SM rated 0W-40 synthetic oil.
A- True
B- False
11- According to SAE J300 a 30 weight oil has a viscosity of between 9.3 and 12.4 centiStokes at operating temperature (212 F).
A- True
B- False
12- In my list of recommended oils what did I list as the best mineral based motor oil in the 50 weight class?
A- Pennzoil multigrade 20W-50
B- Castrol GTX 15W-50
C- Red Line 10W-50
D- Valvoline Durablend 0W-50
E- No oil was recommended
13- You are running 5W-40 Shell Helix Ultra fully synthetic motor oil in your Mercedes Benz. You are in a K-Mart shopping center and checked your oil and it is 1 1/2 quarts low. You will need to add one can of oil. Which of the following is the best choice.
A- Mobil 1 - 0W-40
B- Pennzoil Synthetic 5W-40
C- Red Line Synthetic 5W-40
D- Castrol Syntec 0W-30
E- Shell mineral based 10W-40
14- Motor oils that are labeled “for racing only” should not be used for everyday driving because:
A- They do not have detergents
B- They may have harmful levels of some additives
C- They are generally unrated, there is no SJ, SL or SM approval
D- You would have to take your engine apart and clean it periodically
E- All of the above
15- ASTM stands for:
A- Automotive Standards and Test Methods
B- Automotive Society for Tooling and Machining
C- American Society for Testing and Materials
D- American Standards Trade and Manufacturing
E- Society for American Standard Testing Methods
16- If your engine is running too hot at higher RPM one thing you can try to bring the temperature down is to use a thinner oil.
A- True
B- False
17- Oil with a startup thickness of 100 (at 75 F) that becomes the appropriate thickness of 10 when fully warmed up (212 F) is called a 10W-30 weight motor oil.
A- True
B- False
18- A main advantage that the synthetic has over the mineral based oil of the same grade is the ability to lubricate better at startup.
A- True
B- False
19- In ASTM D 4485 3.1.4: Engine oil is defined as - - “a liquid that reduces friction and wear between moving parts within an engine, and also serves as a coolant.”
A- True
B- False
20- I am (single best answer):
A- Surgeon
B- Biochemist
C- ‘Halfass mechanic
D- Absurdly interested in motor oils
E- All of the above
I feel these were all difficult questions. You would be doing well to get 3 correct.
1- At normal operating temperature, 212 F, a straight 30 weight oil has a viscosity of how many centiStokes?
A- 3
B- 6
C- 10
D- 20
E- 30
The correct answer is C- 10 cS.
2- While racing at 95 F, mid-summer in Florida, which of these synthetic oils gives the best protection at 302 F oil temperature?
A- 0W-40
B- 5W-40
C- 10W-40
D- Straight 40 weight
E- They are all exactly the same
The correct answer is E- They are all exactly the same.
3- While starting up your car at 75 F, mid-winter in Florida, what is the approximate viscosity of a straight 10 (ten) weight motor oil?
A- 3 cS
B- 6 cS
C- 10 cS
D- 20 cS
E- 30 cS or higher
The correct answer is E- 30 cS or higher.
4- The biggest problem with mineral based motor oils with long tern use is:
A- Thinning
B- Thickening
C- Loss of VI (viscosity index) improvers
D- Both A and C
E- None of the above is correct
The correct answer is B- Thickening
5- Which of the following mineral based motor oils are still too thick at a 75 F startup temperature?
A- 20 weight
B- 10 weight
C- 5 weight
D- All of the above
E- None are too thick
The correct answer is D- All of the above
Motor Oil Final Examination
Answer questions without looking back. This is a closed book exam. Base your answers on the information provided in these past chapters.
1- While starting up your car at 75 F, mid-winter in Florida, which of these synthetic oils provides the least startup resistance, minimal battery and starter motor load?
A- 0W-20
B- 0W-30
C- 0W-40
D- 0W-50
E- They are all exactly the same
2- While vacationing in Orlando, it is 104 F mid-summer in Florida. The rental car company put a straight mineral based 30 weight oil in their car because they wanted the operating temperature viscosity to be at 10 cS. What will be the approximate viscosity of the oil when you start up your engine now? (Closest answer)
A- 10 cS
B- 20 cS
C- 30 cS
D- 100 cS
E- 400 cS
3- While vacationing in Florida you are able to race your car at the Sebring track. At an oil temperature of 302 F what is the approximate difference in viscosity between a 20 and 40 weight oil. (Pick the closest number)
A- 1
B- 10
C- 20
D- 40
E- 400
4- Assume there are no losses in the system and your oil pump is truly volume based. Also assume there is no cut off pressure valve and you are using a 40 weight motor oil. If at 1,000 RPM your pressure is 30 and your pump output is 1 (one), what will the pressure and output be at redline, 8,000 RPM?
A- 240 PSI, flow = 8
B- 180 PSI, flow = 8
C- 240 PSI, flow = 4
D- 180 PSI, flow = 4
E- 120 PSI, flow = 8
5- Water can be used as a lubricant.
A- True
B- False
6- If you increase the pressure in a bearing, all other things being constant, the force of separation between the parts increases.
A- True
B- False
7- The best weight oil for racing any Ferrari or Lamborghini is a 40 weight multigrade synthetic oil like Mobil One 0W-40.
A- True
B- False
8- For my Maranello 575 the 0W-20 weight Mobil 1 oil is actually too thick for my driving conditions.
A- True
B- False
9- The major problem with engine oil is that it thins with increasing temperature.
A- True
B- False
10- Your 1993 sports car manual states to use an API / SAE SH rated 10W-40 mineral based motor oil. Your engine has only 1,550 miles on the odometer. On your next oil change it would be better to use a SM rated 0W-40 synthetic oil.
A- True
B- False
11- According to SAE J300 a 30 weight oil has a viscosity of between 9.3 and 12.4 centiStokes at operating temperature (212 F).
A- True
B- False
12- In my list of recommended oils what did I list as the best mineral based motor oil in the 50 weight class?
A- Pennzoil multigrade 20W-50
B- Castrol GTX 15W-50
C- Red Line 10W-50
D- Valvoline Durablend 0W-50
E- No oil was recommended
13- You are running 5W-40 Shell Helix Ultra fully synthetic motor oil in your Mercedes Benz. You are in a K-Mart shopping center and checked your oil and it is 1 1/2 quarts low. You will need to add one can of oil. Which of the following is the best choice.
A- Mobil 1 - 0W-40
B- Pennzoil Synthetic 5W-40
C- Red Line Synthetic 5W-40
D- Castrol Syntec 0W-30
E- Shell mineral based 10W-40
14- Motor oils that are labeled “for racing only” should not be used for everyday driving because:
A- They do not have detergents
B- They may have harmful levels of some additives
C- They are generally unrated, there is no SJ, SL or SM approval
D- You would have to take your engine apart and clean it periodically
E- All of the above
15- ASTM stands for:
A- Automotive Standards and Test Methods
B- Automotive Society for Tooling and Machining
C- American Society for Testing and Materials
D- American Standards Trade and Manufacturing
E- Society for American Standard Testing Methods
16- If your engine is running too hot at higher RPM one thing you can try to bring the temperature down is to use a thinner oil.
A- True
B- False
17- Oil with a startup thickness of 100 (at 75 F) that becomes the appropriate thickness of 10 when fully warmed up (212 F) is called a 10W-30 weight motor oil.
A- True
B- False
18- A main advantage that the synthetic has over the mineral based oil of the same grade is the ability to lubricate better at startup.
A- True
B- False
19- In ASTM D 4485 3.1.4: Engine oil is defined as - - “a liquid that reduces friction and wear between moving parts within an engine, and also serves as a coolant.”
A- True
B- False
20- I am (single best answer):
A- Surgeon
B- Biochemist
C- ‘Halfass mechanic
D- Absurdly interested in motor oils
E- All of the above
