It is important to have the well suited 5w40 synthetic diesel oil. Let’s take you step by step, type by type, and find the best 5w40 synthetic diesel oil for you.

Our review process: Show/Hide

Our Top Picks:

Best Overall: Buy: Shell Rotella 5W40 Synthetic Diesel Oil READ REVIEW

Best For Gasoline Engine: Buy: Valvoline 5W40 Synthetic Diesel Oil READ REVIEW

Best For Synthetic Oils: Buy: Schaeffer Manufacturing Co 5W40 Synthetic Diesel Oil READ REVIEW

Best For Universal Fit: Buy: Mobil 1 5W40 Synthetic Diesel Oil READ REVIEW

Best For High Performance: Buy: Royal Purple 5W40 Synthetic Diesel Oil READ REVIEW

Best For Turbo Car: Buy: Red Line 5W40 Synthetic Diesel Oil READ REVIEW

Best For Boat: Buy: Ford 5W40 Synthetic Diesel Oil READ REVIEW

Best For Cheap Price: Buy: Mobil 5W40 Synthetic Diesel Oil READ REVIEW

Best Overall: Shell Rotella 5W40 Synthetic Diesel Oil

Buy on Amazon

The look and feel of these oils are consistent with the high quality we're used to from the rest of Shell Rotella's lineup. The Shell Rotella 5W40 Synthetic Diesel Oil features exclusive triple protection plus technology, formulated with fully synthetic base oils plus advanced additives to protect against wear, deposits, and oil breakdown. This means that the oil reaches critical engine parts faster. Also, this is the best good deal, comes with the best deal and it is designed to be worth every penny.

The oil also produces more soot plus improves low-temperature flow. Further, it comes with its wide range of specifications and approvals from many of the world's leading engine makers, it is an excellent choice for on-highway fleets, general haul, construction, agriculture, public-transport operators, and diesel pick-up trucks. Most importantly, the shell rotella 5w40 synthetic diesel oil makes for a great buy, does the job and it is compatible with conventional oils.

Most buyers quickly discovered that the oil provides excellent protection against harmful engine wear and sludge. In addition, they strongly agree that the oil is one of the few approved easily available full synthetic oils. In addition, they strongly agree that oil is great for running the t6 5 40 in your power stroke. To sum up, buyers found this to be one of the best oils for daily purposes.

• This comes in a box with 3 bottles, 1 gallon each.
• This van has 467, 000 miles on it and uses no oil.
• This is best for Ram customers 6.7.
• This can be used in a 2003 ford excursion 6.0l diesel.

Best For Gasoline Engine: Valvoline 5W40 Synthetic Diesel Oil

Buy on Amazon

The Valvoline 5W40 Synthetic Diesel Oil is suitable and reliable and fits well with your daily uses. The valvoline 5w40 synthetic diesel oil is effective, allows for a great deal and it is safe. The Manufacturer says: From our flagship motor oils to antifreeze and gear oil, valvoline offers a full range of engine lubricants and cleaners to help keep your vehicle on the road and running at peak performance. Also, it worked fine and it runs great.

Most importantly, the valvoline 5w40 synthetic diesel oil is great with less smoke and it is very good.

Most customers agree that the oil is not compatible with the mb 229.51 engine oil specification. Further, they say that the oil is designed for a gasoline engine. Also, a few also found that the oil is the right oil in the open jug. With no doubts, this product passed the test and had very satisfied buyers eager to share their experience.

• The valvoline motorcycle or valvoline atv oil meet these two specifications.
• Outstanding oxidation resistance supports long oil life in heavy duty engines.
• Valvoline premium blue heavy duty full synthetic engine oil, How the tough get going.
• This is white and it is made with a friction modifier.

Best For Synthetic Oils: Schaeffer Manufacturing Co 5W40 Synthetic Diesel Oil

Buy on Amazon

If you often find yourself confused about appropriate and satisfactory oil, Schaeffer manufacturing co 5w40 synthetic diesel oil should be your first option for buying. The Schaeffer manufacturing co 5w40 syntheticdiesel oil is great for high mileage, protects against oil aeration and it is highly recommend. Manufacturer says: At Schaeffer’s oil, we’re passionate about providing specialized lubricants that allow your equipment and vehicles to last longer, and cost less to maintain. Further, it has excellent cold cranking startability, is made with low ash and it is technical.

Most importantly, the Schaeffer Manufacturing Co 5W40 Synthetic Diesel Oil maintains viscosity and performance in higher operating temperatures, allowing for longer oil life and durability.

Almost all customers opine that the oil is a top tier synthetic oil. In addition, they strongly agree that the oil is the same oil as the older label schaffer’s 9000. In addition, they say that this oil can take longer drain intervals. To sum up, the tone of buyers is very positive and we believe that oil suits the purpose.

• Maintains fuel economy without sacrificing engine durability.
• Superior cold weather startability and operating characteristics.
• Hasn't definitely improved oil consumption ?.
• This has excellent cold cranking, is green and it is compatible with conventional oils.

Best For Universal Fit: Mobil 1 5W40 Synthetic Diesel Oil

Buy on Amazon

The Mobil 1 5W40 Synthetic Diesel Oil's material feels more premium than its price would suggest. The mobil 1 5w40 synthetic diesel oil is suitable for use with nearly all types of modern vehicle engines, from cars and trucks to motorcycles, atvs, farm equipment, and more. Include conventional, synthetic, diesel, bio - based, hybrid ( blends of conventional and synthetic ), and recycled oils. And, it runs smooth, has true synthetic and it is noticeable.

Lastly, the mobil 1 5w40synthetic dieseloil has lowered rpms, is made for good stuff and it is perfect for free delivery.

Almost all buyers quickly discovered that the oil is completely synthetic and always has been. Further, they strongly agree that the oil is a "group iii" defined as "highly refined conventional oil. And, they strongly agree that the oil is a very high quality oil designed for diesel. Overall, the tone of buyers is very positive and we believe that oil suits the purpose.

• This is a great price from Amazon.
• This works perfectly and it is designed for universal fit.
• Package dimensions: 7.63 l x 9.63 h x 8.13 w (inches).
• This is made from crude oil and is used to lubricate, clean, and cool engines.

Best For High Performance: Royal Purple 5W40 Synthetic Diesel Oil

Buy on Amazon

The Royal Purple 5W40 Synthetic Diesel Oil's material feels more premium than its price would suggest. The royal purple 5w40 synthetic diesel oil has increased fuel efficiency, is great for corrosion protection and it is more efficient. Make sure this fits by entering your model number. Further, it is great for fuel efficiency, has take care and it provides for better wear protection.

Lastly, the royal purple 5w40 synthetic diesel oil allows for a great deal, is reasonable and it is designed for better protection.

Almost all buyers opine that the oil provides excellent miles per gallon. Moreover, they say that oil is a great oil for better performance. In addition, they say that the filter and add then refill the oil level once or twice to save on the overall expense of a full oil change. With no doubts, this oil passed the test and had very satisfied buyers eager to share their experience.

• This can often cost more than conventional motor oil.
• This is used to lubricate, clean, and cool engines with the utmost efficiency.
• Meets ilsac gf-5 and dexos1 performance requirements.
• This is compatible with minerals or other synthetic oils.

Best For Turbo Car: Red Line 5W40 Synthetic Diesel Oil

Buy on Amazon

We would, of course, be remiss if we didn't mention Red Line 5W40 Synthetic Diesel Oil for daily purpose. The red line 5w40 syntheticdiesel oil is excessive, is used for high temperature stability and it is made for good stuff. Make sure this fits by entering your model number. Further, this is good for good quality and it is noticeable.

The oil allows extended drain intervals and provides increased cleanliness. Most importantly, the red line 5w40synthetic dieseloil feels better, is great for high quality brand and it is designed for light trucks.

Most buyers quickly discovered that the oil is definitely a long long way long, but the bottom line is this stuff is the hemi tic kyrptonite. Moreover, they strongly agree that the oil is a little pricey compared to others out there, but it is an actual full synthetic. And, a few strongly agree that this oil ( high performance 5w40 ) has a hths vis of 4.4 cp, which is a significant increase over the emissions compromised by synthetic oil. Obviously, this product passed the test and had very satisfied buyers eager to share their experience.

• This provides thicker oil film in bearings and cams.
• This has excellent wear protection, is robust and it provides for better gas mileage.
• This is compatible with other conventional and synthetic motor oils.
• This comes out looking like new.

Best For Boat: Ford 5W40 Synthetic Diesel Oil

Buy on Amazon

The Ford line of oil comes in a pretty wide variety of styles, so you can definitely find one that suits your individual preferences and needs. The Ford 5W40 Synthetic Diesel Oil is simply the best and it is strong. Make sure this fits by entering your model number. In addition, it is made for you right off the bat and it is durable.

Lastly, the ford 5w40 synthetic diesel oil is designed to right on time and it is affordable.

Almost all customers opine that the oil is easy to install, beats walking into any auto parts store. Also, they also found that the oil is the best oil for a ford power stroke diesel in winters. Furthermore, a few also found that the recommended oil for extreme use for the new ford diesels.

• This is made for ford superduty trucks.
• Item package dimension: 10.0" l x 11.0" w x 12.0" h.
• This is running strong and it is good for country of origin.
• This is ideal for service and over - worked diesel motors.

Best For Cheap Price: Mobil 5W40 Synthetic Diesel Oil

Buy on Amazon

The mobile 5w40 synthetic diesel oil's material feels more premium than its price would suggest. The mobile 5w40 synthetic diesel oil is professional, it is strong and has a great design. For best performance, follow the manufacturer's recommendations in your vehicle owner’s manual. This product meets or exceeds the requirements of the latest api, acea, and global industry specifications for diesel engine oils, as well as the requirements of virtually all major American and European engine manufacturers.

Above all, the Mobil 5W40 Synthetic Diesel Oil is suitable for gasoline engines and it is used for lawn mower.s.

Almost all buyers quickly discovered that the oil is easy to order, shows up as advertised. Moreover, a few also found that the oil was designed for DPF exhaust use. In addition, they also found that the oil is great oil for a dirt cheap price.

• This is the best oil you can buy for a diesel engine.
• This improves fuel mileage and quiets the engine.
• This is perfect for non - turbo and it allows for better fuel mileage.
• This is going strong and it is noticeable.