Motor Oil Mid-Term Exam


1At normal operating temperature, 212°F, a straight 30 grade oil has a viscosity of how many centiStokes?

A. 3
B. 6
C. 10
D. 20
E. 30

Answer:

The correct answer is C- 10 cS.


2While 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 grade
E. They are all exactly the same

Answer:

The correct answer is E- They are all exactly the same.


3While starting up your car at 75°F, mid-winter in Florida, what is the approximate viscosity of a straight 10 (ten) grade motor oil?

A. 3 cS
B. 6 cS
C. 10 cS
D. 20 cS
E. 30 cS or higher

Answer:

The correct answer is E- 30 cS or higher.


4The 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

Answer:

The correct answer is B- Thickening


5Which of the following mineral based motor oils are still too thick at a 75°F startup temperature?

A. 20 grade
B. 10 grade
C. 5 grade
D. All of the above
E. None are too thick

Answer:

The correct answer is D- All of the above

 
 

Chapter Ten

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