Finding a diesel engine oil 15w40 that suits your need and does its job well can be challenging. Overall, our tester reviews these diesel engine oil 15w40 with giving ratings and marks for its durability, ease of setup and use. Also the diesel engine oil 15w40 price will be fairly matched the product’s performance, plus with the attractive and sturdy design etc that comes with the product. We conducted hands-on testing for diesel engine oil 15w40 and have the details guide and list provided below.
In this in-depth review guide, we will discuss about the best diesel engine oil 15w40.
Our Top Picks
The Best diesel engine oil 15w40
Delo 400 SDE SAE Conventional Heavy Duty Diesel Engine Oil 15W-40,1 Gallon, Pack of 3
$75.99
in stock
7 new from $75.99
Amazon.com
as of June 23, 2025 2:49 pm
Features
- 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
Shell Rotella T5 Synthetic Blend 15W-40 Diesel Engine Oil (1 Gallon, Case of 3)
$59.19
in stock
8 new from $59.19
Free shipping
Amazon.com
as of June 23, 2025 2:49 pm
Features
- 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 resistance to heat and stress
- Triple Protection Plus technology offers better low-temperature flow, which delivers excellent equipment protection, long engine life, and maintains viscosity control under high temperatures
- Delivers good engine cleanliness and protection against piston deposits, ensuring engine and component reliability at extended oil drain intervals
- Advanced low-ash formulation helps control the blocking or poisoning of exhaust after-treatment devices, helping maintain vehicle emission compliance and engine fuel efficiency
Shell Rotella T4 Triple Protection Conventional 15W-40 Diesel Engine Oil (1-Gallon, Case of 3)
$42.99
in stock
10 new from $42.99
Amazon.com
as of June 23, 2025 2:49 pm
Features
- 15W-40 diesel engine oil with Triple Protection technology protects against wear, deposits, and oil breakdown
- Provides significantly better wear protection than previous generation oils to maximize engine efficiency and prolong engine life
- Formulated with advanced additive technology plus synthetic base oil for enhanced deposit control and superior engine cleanliness throughout the oil drain interval
- Enhanced shear stability for better viscosity control and optimal engine oil pressure
- Outstanding protection for heavy-duty diesel engines, including the latest emission-controlled engines using EGR and containing a diesel particulate filter
Tulux T500 15W40 Classic Diesel Engine Oil - 275 Gallon IBC Tote (1)
$3,272.50
in stock
2 new from $3,272.50
Amazon.com
as of June 23, 2025 2:49 pm
Features
| Part Number | T500 - Tote - 15W40 |
| Size | 275 Gallon Tote (1,000L) |
Shell Rotella T6 Full Synthetic 15W-40 Diesel Engine Oil (1-Gallon, Case of 3)
$67.48
in stock
4 new from $67.48
3 used from $66.81
3 used from $66.81
Free shipping
Amazon.com
as of June 23, 2025 2:49 pm
Features
- Full synthetic 15W-40 diesel engine oil with Triple Protection Plus technology protects against wear, deposits, and oil breakdown
- Formulated to deliver increased protection against oxidation and enhanced deposit control/cleanliness
- Better cold cranking properties and low-temperature pumpability (compared to conventional and synthetic blend 15W-40 motor oil)
- Improved wear performance versus API CJ-4 technology
- Compatibility with exhaust emissions control systems
TRUEGARD 15W-40 Motor Oil 55-Gallon Drum
$706.11
in stock
2 new from $706.11
Amazon.com
as of June 23, 2025 2:49 pm
Features
- API CJ-4 APPROVED
Mobil 1 112786 Delvac 1300 Super 15W-40 Diesel Engine Oil - 4 Gallon Pack
$81.45
in stock
12 new from $81.45
Amazon.com
as of June 23, 2025 2:49 pm
Features
- 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
Valvoline Premium Blue SAE 15W-40 Diesel Engine Oil 1 GA, Case of 3
$76.87
in stock
26 new from $76.87
Amazon.com
as of June 23, 2025 2:49 pm
Features
- 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
Triax Fleet Supreme ESP 15W-40 API CK-4 Full Synthetic Diesel Engine Oil, Friction Optimized and Boosted with Molybdenum and Nano-Boron, Superb Powerstroke Performance (5 Gallon Pail)
$134.49
in stock
2 new from $134.49
Free shipping
Amazon.com
as of June 23, 2025 2:49 pm
Features
- WHY TRIAX: Quieter engine operation, lower operating temperature, 4-6% MPG Improvement, faster and smoother turbo spooling, exceptional cold start properties down to -45 F. Outperforms leading brand motor oils by a wide margin.
- FRICTION MODIFIED: Boosted with Nano-Boron and Moly friction modifiers for significantly improved wear protection over any other diesel engine oils. EXTREME WEAR Protection - Up to 48% lower wear than learning OEM and industry standards due to a much lower friction coefficient (50% lower or better) than the competition.
- IDEAL FOR DIESEL PICK-UP TRUCKS: Full compatibility with any heavy duty diesel trucks from Ford Powerstroke, Chevy Silverado, Dodge RAM, GMC Sierra, and many others.
- LONGEST DRAIN INTERVALS: Capable of drain intervals exceeding 100,000 miles for highway trucks (semis) and 30,000 miles Super Duty Pickups.
- IMPROVED DURABILITY: Very high shear stability and film strength. Maintains its viscosity better than other diesel oils. Protects your engine in severe service conditions such as towing or hauling, without compromising drain intervals.
15W40 CK-4 Synthetic Diesel Engine Oil - 55 Gallon Drum
$873.40
in stock
Amazon.com
as of June 23, 2025 2:49 pm
Features
| Part Number | T700 - Drum - 15W40 |
| Size | Pack Size: 55 Gallon Drum (200L Volume) |
The Video Review of Best diesel engine oil 15w40
Final thoughts
When you’re looking for diesel engine oil 15w40, you’ll want to keep a few things in mind. First, decide what you want to use the diesel engine oil 15w40 for. Next, check the product reviews with comparision which we have listed as well. Once you’ve decided on diesel engine oil 15w40 you want to buy diesel engine oil 15w40, look at the reputation of the manufacturer as well. You can compare prices and quality together before you make your purchase.