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 stand for?

"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 W in oil stand for?

The short answer:The numbers represent the viscosity of the oil and the W stands for WINTER. The long answer:The Society of Automotive Engineers (SAE) has established a numerical code system for grading motor oils according to their viscosity characteristics.

What is 15W-40 oil used for?

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.

What is the difference between 15W-40 and 20W 40?

Originally Answered: What is the difference between 15w 40 and 20w 40? 40 is viscosity at 100°C , that means both have around same viscosity at 100°C but viscosity of 15w40 at 40°C is at 109 and 20w40 at 40°C has 121, 20w40 is thicker than 15w40 and and it is not recommended for cold climates.

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Which is thicker 15w-40 or 20w50?

The higher the number the thicker the oil so in this case 15w40 oil will be a thinner oil. When you say which is better it depends on what the oil is for if it is for a car engine a oil which is 30 or 40 will better to use than a 50.

Can I use 15w-40 oil in my petrol car?

Semi Synthetic 15W-40 is suitable for use in passenger cars, 4WDs & light commercial vehicles and is compatible with Petrol/LPG (Dual Fuel), E10, Diesel (without DPF) and most other conventional fuels.

What does the W in 15W-40 mean?

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).

Is 15W-40 good for winter?

Even without a block heater, our recommendation is to stay with 15W40. The oils are very well formulated and flow at very low temperatures. If running short-haul, say in the Dakotas, you might want to switch to 10W30 year-round.

Which is better 10W30 or 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 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 does 5W 20 mean?

5W20 Meaning

The term 5W20 describes the SAE class according to which the engine oils were specified. They are multigrade oils with very good flow properties at low temperatures. 5W means that the oil is suitable for winter temperatures down to -35 °C.

What does the W stand for on a quart of oil?

The “w” stands for winter and indicates that the lubricant in question has a different viscosity, or different flow characteristics, based on temperature. For example, a 5w30 oil weight rating means that on cold start-up — even at subzero temperatures — the oil flows like a 5 weight oil.

What is 15W engine oil?

THE RIGHT 15W-40 OIL FOR YOUR ENGINE

As a 15W-40 viscosity grade, it flows like a 15 weight oil from start up in Winter, but provides the protection of a 40 weight once the engine reaches full operating temperature.

What does 15W-50 mean in oil?

"15W" refers to the flowability at cold temperatures (W=winter). The oil is still pumpable down to -25 °C, i.e. liquid enough to distribute in the engine. The number "50" describes the flowability of the engine oil at an operating temperature of 100 °C.

Can I use 10W 30 instead of 15W-40?

Since 10W-30 is thinner than 15W-40, 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 10W-30 to protect as well and last as long as 15W-40.

Is 15w40 good for hot weather?

In tropical weather, most OEMs still recommend multi-grade products, such as SAE 15W-40, because the lubricant flows faster through the engine than a pure SAE 40 even at higher ambient temperatures.

Is 5w30 better than 15w40?

Probably not. 15w40 is usually used in diesel engines and has a much different additives profile. 5w30 is usually used in gasoline engines. Diesel oil is designed with high antiwear additives such a ZDDP.

Is 15w40 flammable?

FLAMMABLE PROPERTIES: Flammable FLASH POINT / METHOD USED: 419 ºF (215 ºC) AUTOIGNITION: N/A FLAMMABILITY LIMITS (% by volume in air): LEL: N/A UEL: N/A EXTINGUISHING MEDIA: Dry chemical, carbon dioxide (CO2), halon, foam or water spray is recommended NFPA RATINGS: Health 1; Flammability 1; Reactivity 0.

Is 15W-40 oil thicker than 30 weight?

Next, while hot, 15w40 will be thicker or have a higher viscosity than SAE 30. This is shown by the rating of 40 versus 30 between the two oils. When the engine is warmed up, SAE 30 will flow more easily than 15w40 would.

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.

Which oil is better 5w40 or 15W-40?

This is the lowest temp that it will flow at. 5w40 Is at 5 degrees it will flow and anything colder will make it flow less. Likewise 15w40 is at 15 degrees is the lowest it will flow at.

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.

Is 15W-40 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.

Will diesel oil hurt a gasoline engine?

Yes, you can use diesel oil in a gas engine, provided the diesel oil meets the appropriate specifications and viscosity requirements of your engine.