What does the 15W-40 mean on engine oil?

What does 15W-40 mean? 15W-40 viscosity grade means 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 is the meaning of 15W-40 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.

When should I use 15W-40 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.

Is 15W-40 engine oil good?

ADVANTAGE 15W-40 HEAVY DUTY DIESEL ENGINE OIL has excellent soot dispersancy and wear control while providing outstanding protection against wear and corrosion. Its superior formula reduces sludge, protects against varnish formation and has superior anti-oxidation characteristics and high temperature stability.

What happens if I use 15W-40 instead of 10w30?

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.

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

Which is better 10W 30 or 15W-40?

High quality 10W-30 oils can perform as well, and better than industry-standard 15W-40 oils. The stated viscosity of a HDEO does not represent an exact viscosity, but rather a viscosity within a range on the SAE viscosity scale.

Which engine oil viscosity is best?

The smaller the number, the better it will flow. A 5W-30 will flow easier than a 10W-30 at start-up temperatures and a 10W-30 will flow more easily than a 10W-40 at normal engine operating temperatures. Engine oil viscosity is important. Engine oils naturally thicken as they cool and thin as they are heated.

How cold is 15W-40 good for?

“Its starting temperature range is down to minus 22 F (compared with 15-plus with 15W40) up to 122 degrees F (same as 15W40). That tells you a couple things: There's a 37-degree cold cranking advantage (from minus 22 to plus 15) to a 5W40 and the same benefit on the high end.”

Which is better 5w30 or 15W-40?

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 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 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.

What is better 5w 40 or 15W-40?

5w-40 has a broader operating range than 15w-40. Unless you're penny pinching or you're misinformed about synthetic oils, it's stupid to pick the 15w-40 option. There is a single benefit to 15w-40 oils though, they will maintain their 40 weight operating viscosity longer than an oil that starts at 5w.

Is 15w40 good for gas engines?

Mobil Gas Engine Oil 15W-40 is a premium fleet engine oil specifically formulated to provide reliable protection for trucks and buses using Compressed Natural Gas (CNG) or Liquefied Natural Gas (LNG). Mobil Gas Engine Oil 15W-40 is formulated from high quality base stocks and a balanced additive system.

Can we use 15W-40 instead of 5w30?

5w30 flows better than 15w40. 5w30 provides best cold start properties. Using 15w40 instead of 5w30 will increase your fuel consumption because of more load on your engine's crank. No it won't blow off,you will just wear your engine out quicker because the oil won't flow to the moving parts as quickly !

Which is thicker 15W-40 or SAE 30?

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's the difference between 15W 30 and 15W-40 oil?

In flat conditions, a 15W-40 oil performed nearly 0.8 percent worse than the base 15W-30. The 10W-30 performed nearly 0.2 percent better than the 15W-30. That's close to a 1 percent difference between the 15W-40 and the 10W-30.

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.

How do I choose the right engine oil?

It's best to follow the recommended oil grade, as an engine oil with '40' grade is thicker. That said, it can survive better in higher temperatures. ACEA Rating – The ACEA Rating of engine oil is its lubricant ratings. Some examples of ACEA Rating include A5/B5, A3/B4, etc.

Is 15W-40 OK for diesel engines?

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.

Can you run 15w40 in winter?

If you had an oil pan heater you most likely will get away with it, I used to work a guy that run 15w40 in a 6.2 all winter with a pan heater and doesn't have problems at temps colder than you described.

Is all 15w40 oil the same?

No. Oils carry a certification and must be selected to meet or exceed the recommendations in your engine manual. Oil standards are normally backwards compatible, but the base oils are different.

Is 15W 40 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.

What does the W mean 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.

Is Thicker oil better for older engines?

A: Yes. This is a practical method to improve oil pressure in an older, high-mileage engine. The slightly thicker oil film from the heavier base weight oil - 10W - can help protect worn engine bearings as well.

Will thinner oils damage your engine?

Just like using an oil with too high a viscosity may lead to problems in Brad's engine, using a thinner oil can have the same result. Oil that's too thin can fail to develop a consistent lubricating film, inviting metal-to-metal contact that causes wear. Extreme stress and heat add to the challenge.