Info on oil

[collector240sx]

Answers to the Oil Final Exam
I feel these were all very difficult questions. You would be doing well to get
10 correct.

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
The correct answer is A- 0W-20.

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?
A- 10 cS
B- 20 cS
C- 30 cS
D- 100 cS
E- 400 cS
The correct answer is D- 100 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
The correct answer is A- 1

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
The correct answer is A- 240 PSI, flow = 8

5- Water can be used as a lubricant.
A- True
B- False
The correct answer is A- True

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
The correct answer is 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
The correct answer is B- False. It can best be determined by driving the car
with one type of oil and see what happens.

8- For my Maranello 575 the 0W-20 weight Mobil 1 oil is actually too thick for
my driving conditions.
A- True
B- False
The correct answer is A- True

9- The major problem with engine oil is that it thins with increasing
temperature.
A- True
B- False
The correct answer is B- False. The problem is thickening when the engine is
turned off. With long term use the problem is also thickening.

10- Your 1993 sports car manual states to use an API / SAE SH rated 10W-40
mineral based motor oil. Your engine has only 4,550 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
The correct answer is A- True

11- According to SAE J300 a 0W-30 and a straight 30 weight oil must have a
viscosity of between 9.3 and 12.4 centiStokes at operating temperature (212 F).
A- True
B- False
The correct answer is A- True

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 20W-50
C- Red Line 15W-50
D- Valvoline Durablend 20W-50
E- No oil was recommended
The correct answer is E- No oil was recommended. They all are too thick at
startup for daily use.

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 now. 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
The correct answer is E- Shell mineral based 10W-40. You can mix any SM
rated oil in there but this is my first choice based on my research.

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
The correct answer is 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
The correct answer is C- American Society for Testing and Materials

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
The correct answer is A- True

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
The correct answer is A- True

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
The correct answer is A- True

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
The correct answer is A- True

20- I am (single best answer):
A- Surgeon
B- Biochemist
C- ‘Halfass mechanic
D- Absurdly interested in motor oils
E- All of the above
The correct answer is E- All of the above

[M13]

Yeah I found this on a porsche forum, his logic on oil makes perfect sense to me.

I'm trying it out right now and no complaints!

[bobbo]

For the love of god that is LONG! Excellent info though.. thanks for putting that up!

[GTR-Dad]

Stickied!

I've read enough to know this is info worth keeping around. Thx for posting.
I found one technical error regarding the general relationship for flow and pressure in a turbulent system (P is proportional to Q², not Q), but it doesn't really matter in this context.

Can't wait to get a bit of time to read the 'book' thoroughly.

Dan

[Dragon Humper]

Interesting but by no means the gospel. He made another glaring error in saying that pistons and blocks would expand at the same rate. That's not quite true for alluminum blocks and not even in the ball park for cast iron. Like all Americans that live in the south though he hasn't got a sniff about what life is like in a cold climate. His cold start horror stories aren't nearly as bad as he surmises.

Cars that wouldn't start at 0deg F because the oil was too thick........c'mon.




Jon.

[GTR-Dad]

He made another glaring error in saying that pistons and blocks would expand at the same rate.

Even when materials are have identical thermal expansion coefficients the conductivity of the block sucks heat away from the cylinder bore quickly and the piston heats up faster. Sled guys actually have a term for when you load the engine too hard cold and end up welding the piston to the block.

Dan

[collector240sx]

He obiously had to cut a couple of corners, and for most application
the info is acceptable. But feal free to correct any misleading info.

I choose not to change anything in the original text, by respect
to the original author. It might not be perfect, but he's the one
who wrote the whole thing, and I have to give him credit.

I might be adding some info next summer,depending how things go,
I want to do some test on a couple of brand of oil. Since all the info
I have are from a study in australia, and there is actually some
difference in oil depending the region of the world it's made for.
For exemple, if you look at some bottle intended for the north
american market, on some bottle you can read in the fine print,
that it's sale is prohibited in all other part of the world. Now I
can't say what or if there is a real difference, but I can at
the very least take actual test of the oil available here in canada.
I don't understand why I'm having so much difficulty finding
actual test data, it's so easy to do, and suprisingly not that
expensive. If you compare it to the test oil compagny use. lol

Please feel free to had any info, don't be shy to go in more detail.

Thanks
J-F