how determination useful life of engine oil?
826388
Simple, get an engine and put fresh oil in it. Run the engine until it seizes up and stops running. The time the engine ran is the useful life of the oil. Seriously, engine oil life is calculated by subjecting engine oil to contolled tests, and then measuring breakdown byproducts and changes in mechanical/chemical makeup.  From this a life expectancy under these conditions can be calculated.
165642
power and lubrication
561119
- Test for fuel efficiency by burning different fuels by lighting the source and measuring how long it takes for water to reach a certain temperature.\n\n- temperature/conductivity experiments where you conduct electricity through different metals and measure Amps at different temperatures.\n\n- distill motol oil into all its components and talking about each and how it's really bad for the environment
275912
Sell it on ebay if its some major brand like quaker state, pennzoil, castrol, or mobil, etc. I wouldn't use it of course, or open it if its still sealed.
485181
http://en.wikipedia.org/wiki/Oil_refinery
551941
About 70% of your oil.
498504
Motor oil, olive oil and water.
236674
I would recommend you just put a trickle charger on the battery, change all the fluids, put some stabilizer in the gas, and leave it stored until you need it, by what your doing, you are causing more harm then good, if the oil doesn't get up to temp, it slowly collects moisture (not good) and not only that, since the oil doesn't get up to temp, the engine gets more wear.
280551
There is not sufficient information to calculate efficiency. \n\nFor an engine you need the energy input and the energy output. Energy output divided by energy input times 100 gives you the efficiency. \n\nThe amount of fuel and its energy content will take care of the input. The output requires a dynamometer or some other means of measuring the energy output at the engine shaft
236567
Mineral oil is used in AC power line step down transformers.\nLow frequency though.
632075
Heat\nOver current due to a winding failure. \nContamination of the rotating components causing friction.\nHigh freqency components producing harmonics.\nMetal fatigue, from mfg flaws.\nOver loading the turning shaft.\nStarting and stopping.\nAll the above will generate heat which will destroy a motor.\n\nActually, motors will run longer when they are always rotating at a constant speed and constant load within the design criteria.\n\nMaintain clean environment around it will be the easiest assurance for longevity.
87922
Probably not many uses. It has a half life of 58 minutes. You can read about it at the link.
1056101
Since it's a 2-stroke it actually lubricates the motor from the oil you mix in your gas. The oil your looking for is for the crankcase or transmission. Use a 80 to 90 wieght trans oil. Here is a link of what I used to run in my bike.\nhttp://www.denniskirk.com/jsp/product_catalog/Product.jsp?skuId=&store=Main&catId=120&productId=p30220&leafCatId=12004&mmyId=#altImages
69000
Answer is wear & tear... Old cars have engines which has undergone wear will have loses throgh pistons,valves, gears etc. Due to improper/inadequate maintenance, frictional losses will be higher with time. With proper maintenance of cars/equipments you can keep fuel consumption low.
886982
Motor oil has a higher viscosity than water, which allows it to maintain its lubricating abilities even at high temperatures.
779935
Use Good Engine oil for the Best Speed for your PC. HA HA HA dont mind.
130147
The liquid oil.  If you have capsules, you can cut off one end and smear on the oil.