What does 15W-40 stand for?

The first number 15W is the viscosity of the oil at cold temperature, and the second number 40 is the viscosity at 100 °C. The 15W40 designation means that the oil is a multigrade oil. It has the viscosity of 15W when cold and the viscosity of SAE 40 when hot. This means that one type of oil works in all temperatures.

What does 15W-40 mean with engine oil?

"15W" refers to the flowability at cold temperatures (W=winter). It is still pumpable down to -25 °C, i.e. liquid enough to disperse in the engine. The number "40" describes the flowability of the engine oil at an operating temperature of 100 °C.

What is the difference between 10W 30 and 15W-40?

Because 10W-30 is thinner than 15W-40 oil, its film strength can be weaker and it can be more prone to oxidation. Therefore, high quality additives are needed to compensate for those weaknesses in order for a 10W-30 engine oil to protect as well and last as long as a 15W-40.

What does W means in SAE 15W-40?

Since most heavy-duty oil is multi viscosity, we will concentrate on the two-number system. In 15W-40, the first number on the left (15 here) represents the cold temperature viscosity and contains the letter “W” (which stands for winter, engineers are so creative).

What does the W stand for in oil?

The “W” that you see on oil labels stands for the word "Winter" because this portion of the label shows the viscosity level of oil when an engine is cold. Motor oil that is thinner can flow more easily and faster. This is important because when you start a cold engine, the oil needs to lubricate the equipment quickly.

Engine Oil Rating System - WHAT DOES 15W-40 MEAN?

What does 75W140 mean?

SAE 75W140 meaning

The value before the "W" (W=winter suitability) indicates the flowability of the oil at cold temperatures. Transmission oils with 75W remain flowable up to -40°C. The number "140" refers to the kinematic viscosity of the transmission oil at 100 °C. This has a range of 24.0 and 32.4 mm²/s.

What does the W stand for in 10W 40 oil?

Oils have a specified maximum viscosity at a cold temperature. The lower the W number is (“W” stands for Winter), the thinner the oil will be. In this case, a 10W rated oil will be thicker in winter than a 5W oil. The 40 rating: The 40 represents the oil's viscosity at hot temperatures.

What do SAE oil numbers mean?

SAE number, code for specifying the viscosity of lubricating oil, established by the U.S. Society of Automotive Engineers. The numbers for crankcase lubricants range from 5 to 50, for transmission and axle lubricants they range from 75 to 250; the lower the number, the more readily the oil flows.

What does SAE stand for oil?

A letter for every lubricant type

Therefore the first three letters you need to know are SAE, the acronym of the Society of Automotive Engineers. This society is responsible for establishing a classification system based solely on oil viscosity.

What does the numbers and letters mean on oil?

You might be familiar with terms such as “30-weight” or “10W-30” oil. Those numbers refer to the grade. The higher the number, the thicker the oil. The lower the number, the thinner. Thinner oils flow faster than thicker oils, and engineers design engines to work with a certain grade of oil.

When should I use 15W40 oil?

ADVANTAGE 15W-40 HEAVY DUTY DIESEL ENGINE OIL can be used with complete success in over-the-road diesel trucks, off-highway diesel equipment, farm tractors, and passenger cars and light trucks with diesel, turbo-charged diesel engines, or gasoline engines and is backward compatible with previous API Oil Categories.

Can you run 15W40 in a gas engine?

Others lean toward higher-viscosity oils to protect against wear. Some want to run a 15W-40 oil in their gas engine, and it's often easier to find a 15W-40 or similar viscosity of diesel oil than a gasoline motor oil. Others favor the increased detergency of diesel oils.

Can you use 15W40 as hydraulic oil?

Mobil Agri Super™ 15W-40 is a high performance, multi-functional lubricant for most farm equipment applications. This STOU lubricant provides good performance in diesel and gasoline engines, transmissions, hydraulics, final drives and oil-immersed brakes operating in agricultural service.

Is 15W-40 oil for diesel?

15W-40 is a very common viscosity grade for diesel engine oil. GTX Diesel is a 15W-40 diesel engine oil formulated to help extend engine life.

Which oil viscosity is best?

When driving in temperatures running from 0 to 60 degrees Fahrenheit, a rating of 10W-30 offers excellent all around protection. For driving in extremely hot conditions, 20W-50 oil offers the best protection.

Is 15W-40 oil fully synthetic?

Mobil Delvac™ Extreme 15W-40 is a synthetic, high-performance diesel engine oil that helps extend engine life while providing long drain capability for modern diesel engines operating in extreme conditions.

Is it OK to mix synthetic oil with regular oil?

So, in the end, conventional and synthetic oils are comprised of the same, compatible components – it's just that the components in synthetics are much higher quality. While you can safely mix synthetic and conventional oils, you're doing nothing more than diluting the performance of the synthetic oil.

Is synthetic oil Better?

Synthetic oil is by far better for performance. It protects the engine due to lower levels of friction. Additives help clean the engine of deposits. And, fewer impurities mean it burns cleaner, thickens far more slowly, and has fewer deposits to start.

Is there a difference between SAE oil and regular oil?

Is SAE The Same As Regular Oil? An SAE oil can be regular oil (conventional oil) or other types of engine oil (like synthetic motor oil). An SAE prefix simply means that the oil meets the SAE standard.

Whats the difference between SAE and synthetic oil?

Synthetic oil molecules are more uniform in shape with fewer impurities and better properties than conventional oil molecules. In most cases, synthetic oil has better extreme high temperature and low temperature performance. Synthetic oils are generally formulated with higher performing additives.

Is Mobil 1 a SAE?

Mobil 1™ 0W‐20 Advanced Fuel Economy meets or exceeds many new car warranty requirements where SAE 0W‐20 or 5W‐20 oil is recommended. Mobil 1™ 0W‐20 Advanced Fuel Economy provides the high temperature protection of 5W‐20 oils while offering improved fuel economy.

What do the 2 numbers on oil mean?

As you've probably noticed, most automobile motor oils have two numbers. These are multi-grade oils, which means they are non-Newtonian fluids. The first number describes viscosity at low temperatures. The second number refers to viscosity at normal engine operating temperatures.

What is the best engine oil for hot weather?

There are a few ways to get your car prepared for summer with synthetic oils. If you're capable of changing your oil, you can find synthetics at auto retailers. Look for containers with codes such as 0W-20, 5W-20, and 5W-30. These correspond to specific synthetic oil mixtures approved for standard vehicles.

What happens if you put 10W40 instead of 10W30?

10W40 has a higher viscosity than 10W30. This means that when you pour 10W40 into your engine, it will have a harder time flowing through the engine and moving around the parts. However, if you use 10W40 instead of 10W30, the oil will stay in place better without leaking out or dispersing throughout your engine.

What does 20w50 mean?

SAE 20W-50 is a thicker oil with high viscosity at hot temperatures and is highly resistant to oil thinning. Despite being one of the less popular oil viscosity grades, it's still recommended for a lot of automobile vehicles.