20w50 meaning

17.12.2020 By Tak

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Oil Labelling Explained

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what stands 20W40 for oil quality

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English term or phrase: what stands 20W40 for oil quality. More info. Explanation: The viscosity grade for example, 5W tells you the oil's thickness, or viscosity.

20w50 meaning

A thin oil has a lower number and flows more easily, while thick oils have a higher number and are more resistant to flow. Water has a very low viscosity -- it is thin and flows easily. Honey has a very high viscosity -- it is thick and gooey. Viscosity is ordinarily expressed in terms of the time required for a standard quantity of the fluid at a certain temperature to flow through a standard orifice.The numbers 20W50 refer to the viscosity of the motor oil, set by the Society of American Engineers.

This refers to its fluidity or thickness. The "20W" indicates how quickly the engine will start when cold or in cold weather.

The "50" refers to the thickness of the oil when the motor has been running for a while. Most modern oils are 10W40 or even 5W It is also useful for vehicles subject to hot temperatures and for those used for high-stress activities such as hauling or pulling trailers.

It is also a more effective sealant than thinner oils. Both of these benefits extend engine life. Depending on the recommendations for the particular vehicle, 20W50 oil is suitable for large or small diesel engines, gasoline engines, motorcycles and aviation vehicles.

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It is also suitable for both air- and liquid-cooled engines. This article was written by the It Still Runs team, copy edited and fact checked through a multi-point auditing system, in efforts to ensure our readers only receive the best information. To submit your questions or ideas, or to simply learn more about It Still Runs, contact us.

Why Use 20W50 Motor Oil? Benefits 20W50 motor oil is a high viscosity oil that provides a cushioning and protects against metal-to-metal contact. Suitable Vehicles Depending on the recommendations for the particular vehicle, 20W50 oil is suitable for large or small diesel engines, gasoline engines, motorcycles and aviation vehicles.

About the Author This article was written by the It Still Runs team, copy edited and fact checked through a multi-point auditing system, in efforts to ensure our readers only receive the best information.

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Photo Credits car image by sasha from Fotolia.Since, we have been receiving a lot of queries on engine oils of late, we are bumping it up for all of you who have missed reading it. I have been encountering a lot of confusion among bikers with respect to the different engine oil recommendations from manufacturers for their respective vehicles.

This article is prepared to make a layman understand what does different grading signify and its implications on our engines in a very simple language. Now what is this xWy and what precautions should I take to ensure I am doing the right thing.

Let us understand letter by letter. Viscosity, simply put, is nothing but the thickness of a liquid. Higher this number, thicker is that liquid and obviously more resistant to flow across.

20w50 meaning

And thinner the liquid easier does it flow across. So ketchup would have a higher viscosity number or viscosity index and water would have a lower viscosity number.

When you put a drop of each on a table and try to slide, you would notice that water easily flows across whereas ketchup takes its own little time to slide down. The same principle is applicable to engine oils. As soon as we crank our engines, the internal temperature is generally cooler as compared to an instant when the engine is running and there are a lot of internal engine parts which move and rough up with each other.

Hence the oil is required to quickly move up to all those parts and clung on them for better protection. The lower the number, easier it would be for it to flow across and cover up the roughing engine parts. Hence a 5w50 engine oil would be better than a 20w50 engine oil here.

Consider an example when you have been riding for an hour continuously on your bike in scorching summer at stop and go city traffic. Do you understand the amount of heat generated and the temperature inside the engine at this instant?

And we all know that under higher temperature liquids have this property of becoming thinner. If this is not taken care of, engine oil would become thinner like water and would not clung to the walls of engine and loose its property of proper lubrication.

For better understanding, let us take an example: I and one of my friend start together on two Pulsar s.

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I am using xW50 oil and my friend is using xW40 oil forget about what the manufacturer has recommended for an instant. We ride on same roads and under similar conditions. After an hour, which engine oil do you think would be more effective? I hope you have understood till here. However, I have a few more pointers to make which even if you do not understand completely right now, you will gradually get them. We generally prefer and suggest Motul Engine Oils over other oils available in the market as we have had good experiences with them.

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“Which Engine Oil Shall I Use?” – Engine Oil Explained in Very Simple Terms

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Previously Viewed. Unanswered Questions. Harley-Davidson Motorcycles. Honda Motorcycles. Yamaha Motorcycles. Wiki User This weight of oil is thicker and tolerates higher engine temperatures. Harley Davidson motorcycles, turbocharged automobiles are two common uses. One additional consideration would be the use of synthetic motoroils as these oils do not suffer breakdown boiling off, burning, blackening at higher engine temperatures.

Examples: Mobil One Synthetic 20W Stay away from synthetics. I stuck with H-D 20w Good luck! Any motorcycle oil with the weight 20W I use Valvoline 4 stroke motorcycle oil 20W50 and it works fine! Asked in Harley-Davidson Motorcycles What kind of motor oil does a Harley-Davidson softail take - cc fuel-injected? Just about any quality 20W50 motor oil will work, but Harley recommends either their own 20W50 Syn3 or their fossil 20W50 oil, both made by Citgo.

The owners manual recommends 5w30 or 10w30 I would not use 20wMost of the time when viscosity is explained words are used that are too technical for the average person to quickly grasp. This leaves them still wondering what the viscosity numbers really mean on a bottle of motor oil.

Simply put, viscosity is the oil's resistance to flow or, for the layman, an oil's speed of flow as measured through a device known as a viscometer.

The thicker higher viscosity of an oil, the slower it will flow. You will see oil viscosity measurement in lube articles stated in kinematic kv and absolute cSt terms. These are translated into the easier to understand SAE viscosity numbers you see on an oil bottle. What does a 5W do that an SAE 30 won't?

When you see a W on a viscosity rating it means that this oil viscosity has been tested at a Colder temperature. The difference is when the viscosity is tested at a much colder temperature. This allows the engine to get quick oil flow when it is started cold verses dry running until lubricant either warms up sufficiently or is finally forced through the engine oil system.

The advantages of a low W viscosity number is obvious. The quicker the oil flows cold, the less dry running. Less dry running means much less engine wear. Obviously, cold temperature or W ratings are tested differently than regular SAE viscosity ratings. Simply put, these tests are done with a different temperature system.

There is a scale for the Wor winter viscosity grades and, depending on which grade is selected, testing is done at different temperatures. See the Tables to the right below for more information. Using a table they determine SAE viscosity based on different ranges. Thicker or heavy viscosity oils will take longer to flow through the orifice in the viscometer and end up in higher number ranges such as SAE 50 or SAE 60 for example. Occasionally it is possible for an oil to barely fall into one viscosity range.

For example, an oil is barely an SAE 30 having a time that puts it on the very low side. Technically speaking these oils will be close to the same viscosity even though one is an SAE 20 and the other an SAE But you have to draw the line somewhere and that's how the SAE system is designed.

Another system takes more accurate numbers into account known as cSt abbreviated for centistokes. You'll see these numbers used often for industrial lubricants such as compressor or hydraulic oils. You'll see the ranges for cSt compared to SAE numbers. An oil that is 9. This is why the cSt centistokes numbers more accurately show oil viscosity. Now if you look at the table labeled Winter or "W" Gradesyou can get valuable information on how the W or winter grade viscosities are measured.

Basically, as shown by the chart, when the oil is reduced to a colder temperature it is measured for performance factors. Consequently, if the motor oil performs like a SAE 20 motor oil at the reduced temperatures the scale varies - see the chartthen it will be a SAE 20W motor oil. Getting the picture? And so forth and so on! I can't tell you how many times I have heard someone, usually an auto mechanic, say that they wouldn't use a 5W motor oil because it is, "Too thin.

At engine operating temperatures these oils are the same. The only time the 5W oil is "thin" is at cold start up conditions where you need it to be "thin. The addition of Pour Point Depressant additives VI keep the paraffin in petroleum base oils from coalescing together when temperature drops. Pour Point Depressants can keep an oil fluid in extreme cold temperatures, such as in the arctic regions.The best oils for most cars will be a "0" grade oil is in 0W When you see a W on a viscosity rating it means that this oil viscosity has been tested at a Colder temperature.

The difference is when the viscosity is tested at a much colder temperature. The viscosity grade for example, 20W tells you the oil's thickness, or viscosity. A thin oil has a lower number and flows more easily, while thick oils have a higher number and are more resistant to flow.

SAE viscosity gradings include the following, from low to high viscosity: 0, 5, 10, 15, 20, 25, 30, 40, 50 or The numbers 0, 5, 10, 15 and 25 are suffixed with the letter W, designating they are "winter" not "weight" or cold-start viscosity, at lower temperature. The number 20 comes with or without a W, depending on whether it is being used to denote a cold or hot viscosity grade.

W is for winter you are correct. The SAE designation on motor oil refers to the viscosity standards set by the Society of Automotive Engineers The first number rates the viscosity of the oil at a temperature of 0 degrees F, The second number repeats the test at degrees F. Lower first number mean the oil is thinner in cold temperatures. The W designator was added in due to new formulations of oil. It classifies motor oils according to certain viscosities and very general temperature ranges at which they can be used.

The acronym appears on the back bottle labels above the UPC universal product code. Diablo's answer is right on. The "W" used to stand for "winter" but not so much anymore. But the oil does indeed behave as if it is a thinner oil at low temperatures, but the behavior cold vs. I don't remember what the differences are. Not trying to gainsay Diablo's answer at all, he's right. But for more meat on the matter, check www. You will learn waaaay more than you ever thought there was to know about motor oil.

Engine oil. Answer Save. Robert M Lv 7. This Site Might Help You. RE: what does SAE 20w engine oil mean? How do you think about the answers? You can sign in to vote the answer. Barbara Lv 4. Still have questions? Get your answers by asking now.View Full Version : Oil Viscosity Please explain 5W, 10W, what does each number mean?

Hi all, i have tried to do a search on oil viscosity but can't seem to get the info i want. If you take an oil like 5W, does this mean that at cold 5W the oil is thiner, but at operating temperature the oil gets thicker Each person i spoke to gives me a different answer. I was also told that it is impossible for a thin oil to get thicker when it is hot. I can't seem to find the answer i my previous searchs.

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Can anyone help. Its quite simple the oil is behaves like a less viscous liquid 5 when cold but behaves like a higher viscousity liquid 30 when warm this doesn't mean that when the oil is warm, it is thicker than when it is cold. Think about how most standards are set. Generally, for colder climates, the thinner oils lower 'W' rating are more suitable for max engine protection. It's the other way around for warmer climates. Not that long ago, both Ford and Holden recommended owners use a 20W oil.

It wasn't until the introduction of the AU that Ford claimed better fuel economy because of the switch to 10W oil from the factory.

Holden were less than impressed with Ford's claims and decided to follow suit. The lower the 1st number, the quicker an oil pumps up when starting, the higher the 2nd number, the thicker an oil is at operating temperature. Though this is not always the case when looking at the specs of an oil. When selecting an oil, take into account: 1.

Engine Oil Grades Explained

Season - Winter, Summer etc 2. Driving habit - Cruising around, flatchanging and redlining The following should explain. You also have to cosider the engine power when selecting oil. The more power you have the higher you want the second number because of bearing loads.

Motor Oil Viscosity Grades

Thats why the Castrol Formula R 10W is rated for extreme engines. The 10 gets it around the engine fast, the 60 protects it under high loads. That fuel economy stuff is good marketing for Joe public, but us high performance modifiers have a different set of requirements. To that guy that told you oils can't get thicker when there temperature increase, its true but then how do they control viscosity as it gets so hot?

20w50 meaning

If your handbook reccomends say 5W oil normal mineral and you want to run synthetic do you use the same grade? As a guess I would say yes. I went from a mineral oil to a Synthetic with lighter figures and it blew clowds of smoke.

I think on a worn engine you need to use the same or thicker.