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  • #16
    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
    14 VW Jetta TDI
    05 Sentra SpecV - winter beater -
    95 240sx (RB25DET powered)
    95 240sx ( powered)
    89 GTR - Money Pit -

    Comment


    • #17
      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!

      Comment


      • #18
        For the love of god that is LONG! Excellent info though.. thanks for putting that up!

        Comment


        • #19
          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
          sigpic
          The Beaumont Connection

          Comment


          • #20
            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.
            Why don't you come over to MySpace and Twitter my Yahoo untill I Google all over your Facebook.

            1990 GTR Drag Special T88H34D 11.24 @ 127.55mph at only 1.2bar...... officially. SOLD

            Comment


            • #21
              Originally posted by Dragon Humper View Post
              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
              sigpic
              The Beaumont Connection

              Comment


              • #22
                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
                14 VW Jetta TDI
                05 Sentra SpecV - winter beater -
                95 240sx (RB25DET powered)
                95 240sx ( powered)
                89 GTR - Money Pit -

                Comment

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