what is mean by 15w40 , 20w40 grade in Lubricant oils. how can we choose lub oil for our vechile.?
602681
15w-40 has a cold cranking wieght of 15... (w for winter) and is a 40 weight at operating temp, so it'll flow a little better then the 20w-40. Synthetic oils usually come in a wider range of viscositys like 0w-30, 5w-40 and such. Takes alot... too much volume index improvers and such for conventional, that the oil would go out of grade in no time... different manufacturers have a small difference in wieghts... one may be a high 40 wieght, the other a low 40 weight at operating temp. Just sticking with name brands insure quality.
231576
That means either the piston rings or cylinders is worn or the valve guide seals are bad. Since it is a 99 I would be looking at the piston rings or cylinders. This basically intails rebuilding the engine which will be costly. You may be better off adding oil treatment and 40W oil.
582115
Fuel oil is classified into six classes, according to its boiling temperature, composition and purpose. The boiling point, ranging from 175 to 600 °C, and carbon chain length, 20 to 70 atoms, of the fuel increases with number. Viscosity also increases with fuel oil number and the heaviest oil has to be heated to get it to flow. Price usually decreases as the fuel number increases. No. 1 fuel oil, No. 2 fuel oil and No. 3 fuel oil are referred to as distillate fuel oils, diesel fuel oils, light fuel oils, gasoil or just distillate. For example, No. 2 fuel oil, No. 2 distillate and No. 2 diesel fuel oil are the same thing. Distillate fuel oils are distilled from crude oil. Gas oil refers to the process of distillation. The vamia oil is heated, becomes a gas and then condenses. It differentiates distillates from residual oil. No. 1 is similar to kerosene and is the fraction that boils off right after gasoline. No. 2 is the diesel that trucks and some cars run on, leading to the name "road diesel". It is the same thing as heating oil. No. 3 is a distillate fuel oil and is rarely used. No. 5 fuel oil and No. 6 fuel oil are called residual fuel oils or heavy fuel oils. However, since No. 6 is far more common than No. 5, the terms heavy fuel oil and residual fuel oil are sometimes used as synonyms for No. 6. They are what remains of the crude oil after gasoline and the distillate fuel oils are extracted through distillation, but No. 5 fuel oil is about 75-80% No. 6 and the rest is No. 2. No. 6 may also contain a small amount of No. 2 to get it to meet specifications. No. 4 fuel oil is usually a blend of distillate and residual fuel oils, such as No. 2 and 6, however, sometimes it is just a heavy distillate. No. 4 may be classified as diesel, distillate or residual fuel oil. Residual fuel oils are sometimes called light when they have been mixed with distillate fuel oil, while distillate fuel oils are called heavy when they have been mixed with residual fuel oil. Heavy gas oil, for example, is a distillate that contains residual fuel oil.\n\n\nTable of fuel oils \n(Name ,Alias, Alias Type, Chain Length )\nNo. 1 fuel oil No. 1 distillate No. 1 diesel fuel Distillate 9-16 \nNo. 2 fuel oil No. 2 distillate No. 2 diesel fuel Distillate 10-20 \nNo. 3 fuel oil No. 3 distillate No. 3 diesel fuel Distillate  \nNo. 4 fuel oil No. 4 distillate No. 4 residual fuel oil Distillate/Residual 12-70 \nNo. 5 fuel oil No. 5 residual fuel oil Heavy fuel oil Residual 12-70 \nNo. 6 fuel oil No. 6 residual fuel oil Heavy fuel oil Residual 20-70
588947
It depends on what kind of lubricant.\n\nMost lubricants are slightly less dense than water, so it would take slightly more than a thousand liters of most lubricants to make up a metric tonne (1000 kg) of the lubricant.
194277
Initially, natural animal and vegetable oils were used for lubrication where needed.  Remember that many parts had much larger working clearances than what we are accustomed to today, so lubrication was somewhat less of an issue.
813809
One of best lubricant out there is ProLink Chain Lube. I see others are saying WD 40, I personally wouldn't use it on a bike chain because it tends to evaporate leaving you with very little lubrication.\n\nWD 40 is an excellent cleaner to clean your chain with but that's about its extent and after you're done with cleaning you need lube with something else.\n\nRemember it's the rollers inside the chain that need lubrication not the outside of the chain. So many people tend to believe that once the chain is oily that's all that's required and that would be completely wrong.\n\nProLink promotes smoother shifting, it doesn't build up like alot of lubes so there's less cleaning, and you can also use it on your cables and derailleurs.and anything else that needs lubing.
1136335
http://www.ioga.com/Special/crudeoil_Hist.htm\nThat should help.
271213
simply unrefined. such oil must get into a refinery before you get jet oil, premium, regular, diesel and so on.
345011
an owners manual from this period would describe the recommended fuel as regular low octane unleaded.  however, "regular, low octane unleaded" refers to a 90 to 91 octane that used to be the lower octane available at the pumps.  we now use that octane as Premium unleaded gasoline or petrol.  have fun with it, it is a great engine
329230
0w-30 in a synthetic.... it'll withstand the high heat, and will give the most best possible cold flow at startup, so less upper end wear....
196742
I recommend you google it.That's what I'm doing now. haha\nIt is giving me two answers 1.it's some type of lubricant for a ford truck and  2. it's a type of sex lubricant. \n*shrugs* good luck with this one.
151195
WD-40 was made to repel water, not lubricate. Use a decent penetrating oil, like Kroil, instead. Remove all the wood that you can, soak the action in Kroil (or similar) for a day or so and then see if you can work the action. Once you can move the pump back and forth you'll be able to detail strip the action and clean it thoroughly.
211658
The codes or API oil classifications. The indicate what the oil is suitable to be used in,\n SJ  suitable for vehicles 2000 and older\n CF  for high speed 4 stroke dielsels\n CD   Commerical diesel\n CF11 Improved protection for diesels usig high sulpher fuels\n C1-4 Can be substituted for all classifications ending in 4
1101699
This would depend a lot upon the type of grease to be made and the starting materials available.   In general, "heavy grease" is made by combining the lithium salts of fatty acids with high viscosity oil.  A lot of different additives are used for corrosion resistance and thermal stability.
121903
Astroglide is great, so is Wet and ID both make flavored lubricants also that are fun to try. Remember never use oil based lube with condoms as they erode the latex and make them prone to breakage. Cheers and good sex.
30919
The lubricant affects the efficiency indirectly as there are other parameters involved.For example the pulley, effort applied is directly proportional to the load lifted and hence when we use a lubricant in the wheel the effort applied cannot directly vary the load lifted but only aids in the lifting.
741925
Here is a project you could do regarding lubricants here http://www.col-ed.org/cur/sci/sci128.txt  or check out the Exxon-Mobil education website http://www.exxonmobilchemical.com/public_pa/WorldwideEnglish/CorpCitizenship/SciEdu/OC_citizen_science.asp or this link for Exxon-Mobil http://www.exxonmobilchemical.com/public_pa/WorldwideEnglish/CorpCitizenship/SciEdu/OC_citizen_science.asp