20 Best 15w40 Oil Synthetic [2024]

Are you looking for the best 15w40 Oil Synthetic? Based on expert reviews, we ranked them. We've listed our top-ranked picks, including the top-selling 15w40 Oil Synthetic.

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# Preview Product
1 Valvoline Premium Blue SAE 15W-40 Diesel Engine Oil 1 GA, Case of 3 Valvoline Premium Blue SAE 15W-40 Diesel Engine Oil 1 GA, Case of 3
2 Lucas Oil 10299-PK4 Synthetic 15W-40 CJ-4 Truck Oil - 1 Gallon Jug, Pack of 4 Lucas Oil 10299-PK4 Synthetic 15W-40 CJ-4 Truck Oil - 1 Gallon Jug, Pack of 4
3 Schaeffer Manufacturing Co. 0700CK4-012 SynShield Durability Advantage 15W-40 Diesel Engine Oil,... Schaeffer Manufacturing Co. 0700CK4-012 SynShield Durability Advantage 15W-40 Diesel Engine Oil,...
4 Triax Fleet Supreme ESP 15W-40 API CK-4 Full Synthetic Diesel Engine Oil, Friction Optimized and... Triax Fleet Supreme ESP 15W-40 API CK-4 Full Synthetic Diesel Engine Oil, Friction Optimized and...
5 Shell Rotella T6 Full Synthetic 15W-40 Diesel Engine Oil (1-Gallon, Case of 3) Shell Rotella T6 Full Synthetic 15W-40 Diesel Engine Oil (1-Gallon, Case of 3)
6 Lucas Oil 10299 SAE 15W-40 CJ-4 Synthetic Motor Oil - 1 Gallon Lucas Oil 10299 SAE 15W-40 CJ-4 Synthetic Motor Oil - 1 Gallon
7 Mobil 1 112786 Delvac 1300 Super 15W-40 Diesel Engine Oil - 4 Gallon Pack Mobil 1 112786 Delvac 1300 Super 15W-40 Diesel Engine Oil - 4 Gallon Pack
8 Delo 400 SDE SAE Conventional Heavy Duty Diesel Engine Oil 15W-40,1 Gallon, Pack of 3 Delo 400 SDE SAE Conventional Heavy Duty Diesel Engine Oil 15W-40,1 Gallon, Pack of 3
9 Ford Oil - Engine Ford Oil - Engine
10 15W40 CK-4 Synthetic Diesel Engine Oil - 55 Gallon Drum 15W40 CK-4 Synthetic Diesel Engine Oil - 55 Gallon Drum
11 Royal Purple 06154 Motor Oil - 15W40 CJ-4-6 pack Royal Purple 06154 Motor Oil - 15W40 CJ-4-6 pack
12 TRUEGARD 15W-40 Motor Oil 55-Gallon Drum TRUEGARD 15W-40 Motor Oil 55-Gallon Drum
13 Ford Genuine XO-15W40-5QSD SAE 15W-40 Super Duty Diesel Motor Oil - 5 Quart Jug Ford Genuine XO-15W40-5QSD SAE 15W-40 Super Duty Diesel Motor Oil - 5 Quart Jug
14 Delo 222290428 400 SDE SAE 15W-40 Motor Oil - 5 Gallon Pail Delo 222290428 400 SDE SAE 15W-40 Motor Oil - 5 Gallon Pail
15 Lucas Oil 10076-PK4 15W-40 Magnum High TBN Truck Oil - 1 Gallon Jug (Pack of 4) Lucas Oil 10076-PK4 15W-40 Magnum High TBN Truck Oil - 1 Gallon Jug (Pack of 4)
16 Shell Rotella T6 Full Synthetic 5W-40 Diesel Engine Oil (1-Gallon, Case of 3) Shell Rotella T6 Full Synthetic 5W-40 Diesel Engine Oil (1-Gallon, Case of 3)
17 Mobil Super 96819 15W-40 Delvac 1300 Motor Oil - 1 Gallon (Pack of 4) Mobil Super 96819 15W-40 Delvac 1300 Motor Oil - 1 Gallon (Pack of 4)
18 Brad Penn009-7158-12PK 15W-40 Racing Oil - 1 Quart, (Case of 12) Brad Penn009-7158-12PK 15W-40 Racing Oil - 1 Quart, (Case of 12)
19 Shell Rotella T5 Synthetic Blend 15W-40 Diesel Engine Oil (1 Gallon, Case of 3) Shell Rotella T5 Synthetic Blend 15W-40 Diesel Engine Oil (1 Gallon, Case of 3)
20 Shell Rotella T6 Full Synthetic 15W-40 Diesel Engine Oil (2.5-Gallon, Case of 2) Shell Rotella T6 Full Synthetic 15W-40 Diesel Engine Oil (2.5-Gallon, Case of 2)
Bestseller No. 1
Valvoline Premium Blue SAE 15W-40 Diesel Engine Oil 1 GA, Case of 3
  • Valvoline Premium Blue Engine oil is The Only One exclusively endorsed and recommended by Cummins
  • Strong shear stability provides stay-in-grade performance
  • Outstanding wear protection
  • Superior deposit protection compared to industry requirements
Bestseller No. 2
Lucas Oil 10299-PK4 Synthetic 15W-40 CJ-4 Truck Oil - 1 Gallon Jug, Pack of 4
  • For best performance, follow the manufacturer's recommendations in your vehicle owner’s manual.
Bestseller No. 3
Schaeffer Manufacturing Co. 0700CK4-012 SynShield Durability Advantage 15W-40 Diesel Engine Oil,...
  • Excellent wear protection during severe operating conditions
  • Oil durability: strong oxidation and viscosity control with less oil consumption
  • Better contamination control with superior soot-busting, deposit-dispersing capability
  • Strong stay-in-grade performance throughout the life of the oil
  • Friction modified with micron moly and penetrate
Bestseller No. 4
Triax Fleet Supreme ESP 15W-40 API CK-4 Full Synthetic Diesel Engine Oil, Friction Optimized and...
  • CRP organic, metallic, Moly plating technology for unsurpassed wear protection, oxidation, and high temp stability
  • Friction modified and VI stabilizer pre-boosted; un-rivaled turbo-charger protection; will not create deposits and ash on turbo bearings (will not fry...
  • Contains state-of-the-art dispersal and ash control systems to keep your engine extremely clean
  • Extreme drain intervals capabilities; 25,000-mile drain interval for pickups and 80,000 for class 8 semi-trucks
  • Eliminates the need to clean diesel particulate filters and is for use in virtually all diesel-powered pickups and heavy-duty trucks, both pre 2007...
Bestseller No. 5
Shell Rotella T6 Full Synthetic 15W-40 Diesel Engine Oil (1-Gallon, Case of 3)
  • Full synthetic 15W-40 diesel engine oil with Triple Protection Plus technology protects against wear, deposits, oil breakdown, and improves...
  • Exceptional wear protection for longer life in a wide range of heavy-duty engine applications — from pickup trucks to tractors to semi rigs
  • Enhanced fuel economy capability of 1.5 percent without compromising engine protection or durability (compared to 15W-40 oils)
  • Multi-functional dispersant additives provide an enhanced level of protection against the effects of soot, dirt, and other contaminants (compared to...
  • Increased shear stability for better viscosity control and optimal engine oil pressure
Bestseller No. 6
Lucas Oil 10299 SAE 15W-40 CJ-4 Synthetic Motor Oil - 1 Gallon
  • Package Dimensions: 8.38 L x 12 H x 3.5 W (inches)
  • Package Weight : 7.8 pounds
  • Country of Origin : United States
  • Fit type: Vehicle Specific
Bestseller No. 7
Mobil 1 112786 Delvac 1300 Super 15W-40 Diesel Engine Oil - 4 Gallon Pack
  • Size: 1 Gallon
  • Type: 15w - 40
  • For usediesel engines requiring 15w-40 engine oil (referbottle for specifications)
  • Extends engine life with its unique additive system
Bestseller No. 8
Delo 400 SDE SAE Conventional Heavy Duty Diesel Engine Oil 15W-40,1 Gallon, Pack of 3
  • Premium quality heavy duty motor oil manufactured in the USA
  • Formulated to meet the requirements of post-2007 low emission engines
  • Provides outstanding performance with ultra-low sulfur diesel and also with normal and low sulfur diesel fuels
  • May be used in older conventional engines and gasoline engines
  • Formulated with ISOSYN technology
Bestseller No. 9
Ford Oil - Engine
  • Country Of Origin: United States
  • Model Number: XO-5W40-5Q3SD
  • Item Package Dimension: 10.0" L x 11.0" W x 12.0" H
  • Item Package Weight: 12.0 lb
Bestseller No. 13
Ford Genuine XO-15W40-5QSD SAE 15W-40 Super Duty Diesel Motor Oil - 5 Quart Jug
  • High-quality diesel engine oil formulated with premium hydro processed base oils and unique additive technology
  • Package Dimensions: 11.176 L x 28.447 H x 23.114 W (centimeters)
  • Package Weight : 4.263 kilograms
  • Country of Origin : United States
SaleBestseller No. 14
Delo 222290428 400 SDE SAE 15W-40 Motor Oil - 5 Gallon Pail
  • Premium quality, heavy duty motor oil manufactured in the USA
  • Formulated to meet the requirements of post-2007 low emission engines
  • Provides outstanding performance with ultra-low sulfur diesel and also with normal and low sulfur diesel fuels
  • May be used in older, conventional engines and gasoline engines
  • Formulated with ISOSYN technology
SaleBestseller No. 15
Lucas Oil 10076-PK4 15W-40 Magnum High TBN Truck Oil - 1 Gallon Jug (Pack of 4)
  • Package Dimensions: 12.75 L x 12.5 H x 12.75 W (inches)
  • Package Weight : 33 pounds
  • Country of Origin : United States
  • Part number: 10076PK4
SaleBestseller No. 16
Shell Rotella T6 Full Synthetic 5W-40 Diesel Engine Oil (1-Gallon, Case of 3)
  • Full synthetic 5W-40 diesel engine oil with Triple Protection Plus technology protects against wear, deposits, oil breakdown, and improves...
  • Exceptional wear protection for longer life in a wide range of heavy-duty engine applications — from pickup trucks to tractors to semi rigs
  • Enhanced fuel economy capability of 1.5 percent without compromising engine protection or durability (compared to 15W-40 oils)
  • Multi-functional dispersant additives provide an enhanced level of protection against the effects of soot, dirt, and other contaminants (compared to...
  • Increased shear stability for better viscosity control and optimal engine oil pressure
SaleBestseller No. 17
Mobil Super 96819 15W-40 Delvac 1300 Motor Oil - 1 Gallon (Pack of 4)
  • Reduced oil consumption
  • Superior low-temperature sludge control in stop-and-go service
  • Outstanding control of high-temperature deposits and oil oxidation
  • Reduced low temperature sludge build-up and high temperature deposits
Bestseller No. 18
Brad Penn009-7158-12PK 15W-40 Racing Oil - 1 Quart, (Case of 12)
  • Product Type :Auto Accessory
  • Package Dimensions: 33.274 H x 25.146 L x 25.908 W (centimeters)
  • Package Weight: 10.659 kilograms
  • Country of Origin : China
SaleBestseller No. 19
Shell Rotella T5 Synthetic Blend 15W-40 Diesel Engine Oil (1 Gallon, Case of 3)
  • Synthetic blend 15W-40 diesel engine oil with Triple Protection Plus technology protects against wear, deposits, and oil breakdown
  • Ideal for on-highway fleets, construction, and agricultural machinery, and diesel pickup trucks — including high-power vehicles that require...
  • Improves low-temperature flow (compared to conventional 15W-40 oils)
  • Helps control engine deposits for reliability at extended oil drain intervals (always follow the OEM recommended oil drain interval)
  • Controls engine wear 37 percent better than the maximum wear requirements in API CK-4 engine wear tests
Bestseller No. 20
Shell Rotella T6 Full Synthetic 15W-40 Diesel Engine Oil (2.5-Gallon, Case of 2)
  • Full synthetic 15W-40 diesel engine oil with Triple Protection Plus technology protects against wear, deposits, oil breakdown, and improves...
  • Exceptional wear protection for longer life in a wide range of heavy-duty engine applications — from pickup trucks to tractors to semi rigs
  • Enhanced fuel economy capability of 1.5 percent without compromising engine protection or durability (compared to 15W-40 oils)
  • Multi-functional dispersant additives provide an enhanced level of protection against the effects of soot, dirt, and other contaminants (compared to...
  • Increased shear stability for better viscosity control and optimal engine oil pressure

Having trouble finding a great 15w40 Oil Synthetic?

This problem is well understood by us because we have gone through the entire 15w40 Oil Synthetic research process ourselves, which is why we have put together a comprehensive list of the best 15w40 Oil Synthetics available in the market today.

After hours of searching and using all the models on the market, we have found the best 15w40 Oil Synthetic for 2023. See our ranking below!

How Do You Buy The Best 15w40 Oil Synthetic?

Do you get stressed out thinking about shopping for a great 15w40 Oil Synthetic? Do doubts keep creeping into your mind?

We understand, because we’ve already gone through the whole process of researching 15w40 Oil Synthetic, which is why we have assembled a comprehensive list of the greatest 15w40 Oil Synthetic available in the current market. We’ve also come up with a list of questions that you probably have yourself.

John Harvards has done the best we can with our thoughts and recommendations, but it’s still crucial that you do thorough research on your own for 15w40 Oil Synthetic that you consider buying. Your questions might include the following:

  • Is it worth buying an 15w40 Oil Synthetic?
  • What benefits are there with buying an 15w40 Oil Synthetic?
  • What factors deserve consideration when shopping for an effective 15w40 Oil Synthetic?
  • Why is it crucial to invest in any 15w40 Oil Synthetic, much less the best one?
  • Which 15w40 Oil Synthetic are good in the current market?
  • Where can you find information like this about 15w40 Oil Synthetic?

We’re convinced that you likely have far more questions than just these regarding 15w40 Oil Synthetic, and the only real way to satisfy your need for knowledge is to get information from as many reputable online sources as you possibly can.

Potential sources can include buying guides for 15w40 Oil Synthetic, rating websites, word-of-mouth testimonials, online forums, and product reviews. Thorough and mindful research is crucial to making sure you get your hands on the best-possible 15w40 Oil Synthetic. Make sure that you are only using trustworthy and credible websites and sources.

John Harvards provides an 15w40 Oil Synthetic buying guide, and the information is totally objective and authentic. We employ both AI and big data in proofreading the collected information.

How did we create this buying guide? We did it using a custom-created selection of algorithms that lets us manifest a top-10 list of the best available 15w40 Oil Synthetic currently available on the market.

This technology we use to assemble our list depends on a variety of factors, including but not limited to the following:

  1. Brand Value: Every brand of 15w40 Oil Synthetic has a value all its own. Most brands offer some sort of unique selling proposition that’s supposed to bring something different to the table than their competitors.
  2. Features: What bells and whistles matter for an 15w40 Oil Synthetic?
  3. Specifications: How powerful they are can be measured.
  4. Product Value: This simply is how much bang for the buck you get from your 15w40 Oil Synthetic.
  5. Customer Ratings: Number ratings grade 15w40 Oil Synthetic objectively.
  6. Customer Reviews: Closely related to ratings, these paragraphs give you first-hand and detailed information from real-world users about their 15w40 Oil Synthetic.
  7. Product Quality: You don’t always get what you pay for with an 15w40 Oil Synthetic, sometimes less, and sometimes more.
  8. Product Reliability: How sturdy and durable an 15w40 Oil Synthetic is should be an indication of how long it will work out for you.

John Harvards always remembers that maintaining 15w40 Oil Synthetic information to stay current is a top priority, which is why we are constantly updating our websites. Learn more about us using online sources.

If you think that anything we present here regarding 15w40 Oil Synthetic is irrelevant, incorrect, misleading, or erroneous, then please let us know promptly!

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FAQ:

Q: What is the different between 15w40 and 15w50?

A: thus for your question, 15W40 and 15W50 are equally viscous, but the ..50 will have more thickening polymers in it than the ..40. the 15W40 is more viscous than the 10W40. 0

Q: Who makes the best synthetic motor oil?

A: Castrol 03084 Edge. After years of research and experimentation,in 2019,Castrol discovered a groundbreaking new fluid titanium technology. Castrol 03087 Edge. Most premium synthetic motor oils become impure or contaminated after 6-7 months of use. … Valvoline – 881147. … Pennzoil Ultra Platinum. … AmazonBasics High Mileage. … Royal Purple 51530. …

Q: What is meant by 15w40 for generator?

A: For a gas generator, most people use plain SAE 30 because they don’t ever run in cold weather (below freezing) and SAE 30 is optimum for warmer weather (per the Onan Handbook). 10W30 or 15W40 is optimum if you want to cover sub-freezing temperature operation as well.

Q: What is the best synthetic oil?

A: The best synthetic motor oil is Mobil 1 94001 5W-30 with its outstanding wear protection due to superior lubrication in high to low temperatures. The reason car oil is so important is due to the fact it lubricates the engine to reduce wear and friction as well as protecting the break down of components from engine heat.