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Looking for the best 15W40 diesel oil? Perfect! You’re in the right place!
In this Tooling Geek guide, you’ll learn:
- Top 10 best 15w40 diesel engine oil
- Comparison among them
- Review & buying guide
- And much more!
|★ Our No #1 Choice ★|
1. Shell Rotella T4 Triple Protection 15W-40
|● Exceptional wear protection for longer engine life.|
● Improved oil aeration.
● Heightened emission control system durability.
● Enhanced protection against oxidation for more efficient operation.
|2. Valvoline Premium SAE 15W40 engine oil||● Superior deposit protection compared to industry requirements.|
● Strong shear stability provides stay-in-grade performance.
● Excellent oxidation resistance and TBN retention support long oil life.
|3. Royal Purple 15W-40 Diesel engine oil||● Superior corrosion protection.|
● Universal fit.
● Provides excellent cold flow and protection at all operating temperatures.
|4. Delo 400 XLE SAE 15W-40 Diesel engine oil||● Exceptional deposit control.|
● Better low-temperature pump ability.
● Superb long drain performance.
|5. Mobil 1 Delvac 1300 15W-40 Diesel oil||● Up to 50 percent more wear protection than required in API engine tests.|
● Outstanding oxidation stability.
● Excellent soot and viscosity control.
|6. Lucas Oil CJ-4 15W-40 Diesel engine oil||● Less oil consumption.|
● Reduces engine wear.
● Compatible with both synthetic and conventional oils.
|7. Schaeffer 15W-40 Diesel engine oil||● 85% less wear than conventional CJ-4 oils.|
● Excellent protection against oil aeration and foaming.
● 77% greater soot handling than conventional CJ-4 oils.
|8. Liqui Moly Touring 15W-40 Diesel engine oil||● Outstanding cold start lubrication.|
● Aging and viscosity stability.
● High lubricating film stability and reliable wear protection.
|9. Castrol GTX 15W-40 Diesel engine oil||● Exceptional protection from piston deposits, oil thickening, and valve train wear.|
● Anti-wear, anti-oxidant, and detergent additives protect.
● Minimizes engine sludge formulation.
|10. Amsoil SAE 15W-40 Marine engine oil||● Heavy duty.|
● Extended drain capabilities reduce downtime and motor oil expenses.
● Exceptional wear protection.
Best 15w40 Diesel Oil Review
1. Shell Rotella T4 Triple Protection 15W-40
Shell Rotella T4 triple protection 15W-40 is configured to provide damn difficult security to accommodate your road performance. It has been tested in thousand miles real-life experiment, Shella Rotella T4 triple protection 15W-40 uses a shell-exclusive patented formula.
Its innovative manufacturing formula protects the engine in the most severe conditions found in modern low-emission engines and older hard-working diesel engines. It shows significantly improved resistance to oil breakdown under high temperatures.
It is proven that Shella Rotella T4 triple safety is known to prevent accumulation up to 50% higher than its existing version. It helps keep the engine running long, clean, and operating efficiently.
Besides, Shell Rotella T4 triple protection 15W-40 provides enhanced protection against viscosity loss due to shear and improved oil aeration. Its decent low ash structure helps to protect the combustion adsorbents and particulate diesel filters used on the new low emission vehicles.
Moreover, it effectively sustains the emissions control system durability where diesel particulate filters and after-treatment systems are used also.
Read More: Shell Rotella gas truck reviews
2. Valvoline Premium Blue SAE 15w40 Diesel Engine Oil
Valvoline premium blue SAE 15W-40 is the only one exclusively endorsed and recommended by Cummins. It is intended to maximize output and safety for modern diesel engines fitted with exhaust control, including those with EGR (exhaust gas recirculation), DPF (Diesel particulate filters), and other modern diesel engine technology.
If you use Valvoline premium blue 8600 ES with Cummins X15 engines, you can enable an exclusive oil drain interval extension of 10,000 miles when operating at an average fuel economy of 7.0 mpg or higher. A 5000-mile engine oil duration expansion is allowed for more extreme service cycles.
However, Valvoline premium blue SAE 15W-40 is a one solution technology for a wide range of heavy-duty engines including diesel, gas, and natural gas applications. Its outstanding oxidation resistance supports long oil life in heavy-duty engines. It also includes superior wear protection for hardworking heavy-duty trucks and equipment.
3. Royal Purple 04154 15w40 Diesel Engine Oil 1 Gallon
Royal Purple 04154 15W-40 diesel engine oil is a highly mentionable 15W-40 diesel engine oil. To make it high-performance moto oil, premium base oils are combined with patented additive technology.
Royal purple 04154 15W-40 diesel engine oil offers superior safety and engine efficiency and it is fully compatible with mineral or other synthetic oils. Royal Purple provides superior corrosion protection and its top-quality synthetic-based oils provide excellent cold flow and protection at all operating temperatures.
Royal Purple comes with robust detergents that remove deposits and maintain engine cleanliness. You can be sure that there will be no rust at all if you use to put this diesel engine on the tank of your vehicle as it has enhanced rust resistance properties.
The patented additive technology also prevents the lubrication starvation and white sludge that is evident in fuel with 20% ethanol or higher. However, before using Royal Purple on your engine you should have to wait until the period of the first oil change given by manufacturers.
In addition, this synthetic blend includes great adhesive innovations that resist friction from metal to metal. Fewer friction results in optimized fuel efficiency.
4. Delo 400 XLE SAE 15W-40 Synthetic Blend Diesel Oil
Delo 400 XLE SAE 15W-40 is an API CK-4 formulated for on-highway application and it is designed specifically to provide support for heavy-duty engines. Including 2017 greenhouse gas (GHG17) compliant diesel engines with lower CO2 emissions.
In addition to 2010 compliant low emission diesel engines with selective catalytic reduction (SCR), diesel particulate filter (DPF), and exhaust gas recirculation (EGR) systems calling for SAE 15W-40 premium heavy-duty motor oil. Delo 400 XLE SAE 15W-40 comes with the next generation massive fuel injection technology and is built to have longer oil life, enhanced wear defense.
This authorized sterile engine oil guarantees that your lubricating oil meets the criteria of OEM cleanliness to help reduce maintenance. It also reduces maintenance costs and extends equipment life.
Due to its superb oxidation efficiency, it provides excellent piston deposit management and internal combustion engine safety. You don’t have to worry about cylinders, pistons, rings, and valve train components because all of them are well protected against wear and corrosion.
5. Mobil 1 Delvac 1300 SAE 15W-40 Diesel Engine Oil
Mobil Delvac 1300 super 15W-40 is a synthetic blend diesel engine oil that helps extend engine life, allowing you to turn your business with confidence. This engine oil meets or exceeds original equipment manufacturer (OEM) requirements and delivers high performance in both on- and off-highway applications.
It also delivers high performance in both newer and older heavy-duty engines. Mobil Delvac 1300 super 15W-40 is recommended to use in a wide range of heavy-duty applications and operating environments in the trucking, mining, construction, agricultural, and marine industries.
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, greater engine efficiency, long engine life, and long oil life, all you have to get with this super motor oil.
6. Lucas Oil 10299 PK4 Synthetic CJ-4 15W40 Truck Oil
Lucas Magnum CJ-4 Oils is the combined version that is blended with premium Lucas additives to help preserve the life of the pollution control system. This oil has been checked up to 30000 miles in semi’s and still meets requirements.
With less oil consumption facility and reduced engine wear in new and older engines. it also avoids deterioration and temperature degradation for complete safety.
Its primary application is heavy-duty but can also be used in automotive diesel and gasoline engines. Compatible for both traditional and synthetic oils and accredited by the API to meet the required industry standards.
7. SynShield Durability Advantage 15W-40 Diesel Oil
Synshield ultra-performance 10W-30 diesel engine oil is a premium synthetic plus, massive diesel engine oil engineered to provide optimum corrosion, degradation, and coating accumulation.
Synshield ultra-performance 10W-30 diesel engine oil is designed for on-highway and off-highway operations that are subject to extreme stop and go unnecessary breaking.
Using proprietary friction modifiers, Micron moly, and penetration, Synshield ultra-performance 10W-30 diesel engine oil creates a slippery, tenacious shield that prevents metal to metal contact for increased engine durability and efficiency.
8. Liqui Moly Touring High SAE 15w40 Diesel Engine Oil
The lubro-Moly touring high tech 15W-40 diesel oil is an all year round, modern, high-performance engine oil specially formulated for aspirated and turbocharged diesel engines with and without charge air coolers.
The lubro-Moly touring high tech 15W-40 diesel oil is popular for both gas and diesel engines even without turbocharged engines for exhaust gas. It has excellent cold-start stimulation, aging and conductivity strength.
With optimal cleanliness of the engine and very excellent dispersant properties, Liqui Moly is Germany’s most popular motor oil brand.
9. Castrol 03849-3PK GTX 15W-40 Diesel Engine Oil
Castrol diesel oil helps to protect engines that can endure extreme weather, rough roads and severe hauls wearing and tearing. Castrol GTX is designed to make the engine work more effectively and prolong its life of it.
It has special viscosity, anti-wear, anti-oxidant, and detergent additives to protect your engine and maintain cleanliness. It includes the highest level of detergent to neutralize acids generated by working diesel engines. Castrol GTX is applicable for gasoline and diesel light trucks and passenger cars.
10. Amsoil SAE 15W-40 Diesel And Marine Engine Oil
Amsoil heavy-duty diesel and marine motor oil is a premium diesel oil that provides excellent performance in all types of diesel engines where highly effective control of wear and deposit is vital.
Engineered with heavy-duty dispersant/detergent additives, its total base number of 12 neutralizes acids and controls soot thickening from exhaust gas recirculation and blow-by to protect against corrosion.
Amsoil heavy-duty diesel oil resists heat and breakdown better than conventional petroleum oils for long-lasting performance and protection.
***The list given above is created based on experiment, demand, and popularity all over the world. The rank shows how familiar they are in the field of the best 15w40 diesel engine oils.
The 15w40 diesel oil is a great choice for your engine because it has the best viscosity. With this type of oil, you can get better fuel economy and make sure that there are fewer deposits in your car’s engine.
The 15w40 grade offers the best performance when combined with fuel injection systems and turbochargers as well as providing excellent protection against wear-related damage during start-ups. It also helps protect engines from rusting due to water condensation which improves their longevity while reducing operating costs at the same time!