## What do the numbers for engine oil mean

Feb 14, 2019 Your car's owner's manual will list the recommended oil weight, of Automotive Engineers) viscosity number and tells you if the oil has Does that mean an oil with just 70 percent base oils is better than one with 95 percent? 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  Two of the most common oils you'll encounter are 5w30 and 10w30. What Do the Numbers Mean? Multi-grade oils are designed to be thin in cold weather so your engine gets the protection it needs while the engine is still warming up.

When you see an oil that’s rated SAE 30, this translates into an engine oil that has a viscosity between 9.3 cSt and 12.5 cSt at 212 degrees F. Multigrade Oils Sometimes it gets much colder than room temperature — particularly during the winter months when the thermometer can plunge well below freezing. During normal driving today the average car can stop and start as many as 18,000 times a year, and all that idling in traffic or waiting at junctions causes microscopic wear in your engine. The lower the “W” number the better the oils cold temperature/cold start performance. The 40 in a 10w-40 simply means that the oil must fall within certain viscosity limits at 100 degC. This is a fixed limit and all oils that end in 40 must achieve these limits. 5w30 is for cold weather, the letters and number mean the weight of the oil 5 is lighter than 10 therefore 5w30 should be ran in weather below 30 degrees it can circulate better and your car will start better. 10w30 is for hotter weather so it keeps the engine cooler.

## There are two numbers that define the viscosity of an oil. The first number ends with the letter 'W', which stands for Winter. This measurement is related to how an oil flows when it is cold, such as at engine start-up. The second number is defined by how an oil flows at normal engine operating temperatures.

I've read that the first number is the viscosity when the engine is cold and the second is the viscosity once the engine is warmed up. Why does  Apr 18, 2015 What are the different types and what do the numbers mean on the bottles? There are tons of myths and facts about motor oil and hopefully we  What do these numbers mean? In a nutshell, the numbers before and after the W represent viscosity. The letter “W” itself stands for Winter. As you may know, viscosity means the thickness of a fluid. In the case of motor oil, it is the thickness of the oil under certain temperature conditions. The number to the left of the W refers to the Automotive oil comes labeled with letters and numbers coding oil weight and additives. The different characters stand for engine-cleaning protection, what type of engine to use the oil on and the viscosity of the oil at different temperatures. Viscosity is the stickiness or thickness of the oil. It affects the

### With the introduction of new oil additives starting in the 1940s, the compound viscosities replaced single-viscosity motor oil. The "W" refers to "winter." The first

Two of the most common oils you'll encounter are 5w30 and 10w30. What Do the Numbers Mean? Multi-grade oils are designed to be thin in cold weather so your engine gets the protection it needs while the engine is still warming up. Feb 21, 2019 What do these viscosity grades mean? As with monograde oils, the 'W' still means 'winter'. The number before this 'W' represents the winter  Feb 20, 2020 The suffix W indicates that the oil is suitable for winter use. W oils are rated according to their flow rates at 0° F (-17.8° C); other types are tested at  The 'W' rating can be 5, 10, 15 or {20;} lower numbers mean the oil is thinner in cold temperatures, necessary for icy climates. The second  What Do Oil Numbers Mean? A key characteristic of how oil does its job is viscosity – the thicker the oil, the higher the viscosity number. Thinner is oils move  Aug 23, 2012 So, what do these numbers mean? Engine oil grade. Photo credit: Thinkstock. Choosing the right grade of motor oil

### Apr 18, 2014 When comparing multi-grade oils, the lower number represents the oil's viscosity at the lowest recommended temperature, the higher number

Feb 14, 2019 Your car's owner's manual will list the recommended oil weight, of Automotive Engineers) viscosity number and tells you if the oil has Does that mean an oil with just 70 percent base oils is better than one with 95 percent? 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  Two of the most common oils you'll encounter are 5w30 and 10w30. What Do the Numbers Mean? Multi-grade oils are designed to be thin in cold weather so your engine gets the protection it needs while the engine is still warming up.

## The first number in the oil classification refers to a cold weather viscosity. The lower this number is, the less viscous your oil will be at low temperatures. For example, a 5W- motor oil will flow better at lower temperatures than a 15W- motor oil.

Nov 18, 2015 There will be two numbers, a low number and high number. The low number indicates how thin the oil is rated to be, while the larger number is  Dec 10, 2014 That designates the oil as a winter grade. Those numbers that don't have the W were tested at 210°F, the approximate temperature of an engine  Jul 29, 2016 Using the correct oil will prolong the life of the engine and can Multigrade oils span a wide viscosity range and consist of two numbers on the  I've read that the first number is the viscosity when the engine is cold and the second is the viscosity once the engine is warmed up. Why does  Apr 18, 2015 What are the different types and what do the numbers mean on the bottles? There are tons of myths and facts about motor oil and hopefully we

"What base number should oil have?" The base number (BN) is a property that is more associated with engine oils rather than industrial oils. It can be defined as  Apr 18, 2014 When comparing multi-grade oils, the lower number represents the oil's viscosity at the lowest recommended temperature, the higher number  encourage a structure where a small number of global engine oil specifications replace  Nov 5, 2014 And why two numbers are there 20 & 40? Surprisingly! W = #WINTER, not weight or watt or anything else for that matter) and engine oils use a  Aug 4, 2019 The SAE Viscosity Number did not in any way imply suitability for any NO IDEA what the SAE Numbers on Motor Oil Labels really mean. Base numbers generally apply to diesel engine crankcase oils. Base number represents the level of alkalinity reserve available for neutralizing acids formed  Oct 1, 2019 What do these numbers mean and why do they matter? These oil “weights” are not weights at all, but a measure of the motor oil viscosity.