Oil is the lifeblood of her truck’s engine – the tasked v reducing friction, cooling, cleaning, sealing, shock dampening, power transferring and also corrosion protection.

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Now, also though the 5.9 Cummins likes to note its region by leaking oil way too often, it’s still a an excellent engine and also should outlive her truck’s frame and body. Assuming the you law it effectively with regular oil changes and good quality man-made motor oil, the is.

But i m sorry engine oil have to you use? Is there anything details that you need to look the end for once buying diesel engine oil?

Well, stick roughly because that’s specifically what fine be talking about in this article, but before we review the five best oils because that the 5.9 Cummins, here’s an oil viscosity graph to help you made decision the best viscosity for your 5.9 Cummins:

5.9 Cummins Oil Capacity and also Oil Viscosity Chart

All 5.9 Cummins versions have actually a 12-quart oil capacity consisting of the oil filter.

Low ash oil is recommended. Engine oils v high ash content might produce shop on valves and ultimately result in guttering and also valve burning. The best sulfated ash content of 1.85 massive % is recommended for all 5.9 Cummins 12 and 24 valve engines.

Make sure you obtain the ideal grade motor oil for your ambient temperature range:

2003 – 2007 5.9L CUMMINS ISB (24 VALVE, typical RAIL)

Ambient Temperature RangeRecommended Oil Viscosity
Above 0° FSAE 15W-40
All temperatures SAE 5W-40 synthetic

1998.5 – 2002 5.9L CUMMINS ISB (24 VALVE)

Ambient Temperature RangeRecommended Oil Viscosity
Above 10° FSAE 15W-40
10° F to 30° FSAE 10W-30
0° F come -10° F (with block heater)SAE 10W-30
Below 0° F (without block heater)SAE 5W-30 Synthetic

1989 – 1998 5.9L CUMMINS (12 VALVE)

Ambient Temperature RangeRecommended Oil Viscosity
Above 10° FSAE 15W-40
0° F to 10° F SAE 10W-30
0° F come -10° F (with block heater)SAE 10W-30
Below 0° F (without block heater)SAE 5W-30 Synthetic

Note: constantly consult your vehicles owners manual for the right oil requirements and recommendations.

The 5 best Oils for 5.9 Cummins

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Lubrication & security

Delvac 1300 supervisor 15W-40 is a high-performance fabricated blend diesel engine oil designed come be used in all heavy-duty applications, including marine. That meets or above the needs for API CK-4 and older, definition that that compatible and also recommended for usage in diesel engines with the recent emissions regulate systems and also older diesel engines, like the 5.9 Cummins.

Its fabricated composition gives outstanding oxidation stability, definition that it won’t thicken, kind nasty deposits, and lose all of its properties as quick as standard diesel engine oils. The also way that the Delvac 1300 super 15W-40 is capable of expanded oil drainpipe intervals that assist the atmosphere and also your wallet since you won’t have to adjust the oil on your 5.9 Cummins as often.

Delvac 1300 supervisor 15W-40 stays fluid in cold weather to offer your engine smooth starts and also immediate security to your valvetrain, bearings, and also other an important lubrication points.

Additive ingredient

The special base oil technology, with hydro-processed base stocks and an outstanding additive package, allows the Delvac 1300 supervisor 15W-40 come resist too much oil consumption and corrosive and also abrasive wear.

It promotes lengthy gasket and seal life and also controls soot buildup yes, really well. Due to the fact that of its good soot and also acid corrosion regulate additives, the Delvac 1300 supervisor 15W-40 allows your engine to keep its fuel efficiency throughout the extended drainpipe intervals.

Compatibility

Delvac 1300 super 15W-40 was occurred in teamwork with the biggest engine manufacturers and also is as such approved for Volvo VDS-4.5 and also 4, Renault RLD-3, MB 228.31, male M 3575, Mack EOS-4.5, Mack EO-O Premium Plus, Deutz DQC II-10 LA, Detroit Fluids Specification 93K218 and also 93K222 and meets or over the requirements of Cummins CES 20086 and more.

Things come Consider prior to Buying Engine Oil for the 5.9 Cummins

Even though the 5.9 Cummins is no that picky as soon as it concerns motor oil, there space a few things you must consider before you go out and make her purchase.

Make sure You gain the appropriate Grade (Viscosity) engine Oil

Viscosity has always been and also will continue to be the most essential factor when choosing motor oil. That affects heat generation and wear, governs the sealing effect of engine oil, and determines how much power it will take to start and also keep an engine to run under assorted temperature conditions.

Viscosity is a measure of the oil’s resistance to flow and it’s directly influenced by the temperature of the oil, where its viscosity to reduce with raising temperature and vise versa. This is one of the reasons why engines space harder to start in freezing temperatures.

To make oil viscosity simpler to know for the buyer, the society of Automotive designers (SAE) emerged a range for motor oil viscosity ratings referred to as oil grade. It’s explained in an easy-to-understand, but thorough method by The fix Specialist in this video:


The engineers at Cummins spent painstaking hours testing different grade motor oil in bespeak to discover what functions best. They take it RPM, clearances in between moving parts at various temperatures, and also countless other components into consideration, therefore, it’s extremely crucial to usage the best grade engine oil that they recommend.

Conventional vs man-made Oil

There are a variety of reasons why man-made oil is better than conventional however that doesn’t mean that you must only be making use of synthetic.

Synthetic motor oils have a natural capability to maintain comparable viscosity throughout temperature changes. They don’t thicken as lot in freezing temperatures, thus they perform better in cold temperatures and especially – the very first seconds after startup where most engine wear actually occurs. Alongside far better protection against wear, fabricated oils mitigate the quantity of energy that is needed to start the engine and also keep the running, which rises the effectiveness of the engine and also ultimately offers you better mileage.

And that doesn’t end there – synthetic engine oil kicks conventional oil’s ass in exceptionally high temperatures as well. Among the key disadvantages of standard motor oil is its high volatility.

Nowadays, pretty lot all diesel engines have actually a turbocharger the gets really warm under heavy loads, and if girlfriend shut her engine down and also stop the oil flow while the turbo is pretty much red hot, the leftover oil inside the turbo will begin boiling. Standard oil is rather volatile when compared to synthetic, meaning that standard oil “volatilizes” and “evaporates” easier, leave deposits that could reduce or completely block oil circulation to the turbo – this is dubbed “turbo coking” and also it’s something girlfriend don’t desire to happen to your 5.9 Cummins.

When have to You Use standard Oil?

If not specifically recommended or required in your auto owner’s manual, using typical motor oil would certainly make feeling if you’re short on cash and your engine isn’t subjected to freezing temperatures, doesn’t have actually a turbo or is no operating in too much conditions.

In the owner manual, extreme conditions for the 5.9 Cummins are:

Frequent brief trips where your engine does no reach the operating temperature of 190° F.Excessive idling (over 10 minutes) at ambient temperatures reduced than 32° F.Frequent towing.Dusty control conditions.Commercial organization – taxi, police, delivery, etc.Off-road or desert operation.Extensive operation at high engine RPMs (greater 보다 2900 RPM) and also loads (70% throttle).

However, if her 5.9 Cummins is based on these extreme operating conditions or if you nothing mind payment a little bit extra to rightfully preserve its longevity, then full man-made or semi-synthetic engine oil would definitely be the best an option you deserve to make for her engine.

Low Ash Content

The only necessity apart native the exactly viscosity for the 5.9 Cummins is to use low ash engine oil. Designers at Cummins have noticed in the past that high ash content motor oil would create deposits on valves to the point where valve burn occurs, thus Cummins recommends utilizing motor oil that has actually maximum sulfated ash contents of 1.85 fixed %. So, as lengthy as you use API CI-4 certified engine oil, you should be good to go.

Do I need to include Oil Additives?

No, you must never use oil additives if you’re running good quality engine oil. Most (if not all) API certified engine oils currently have every the additives your engine needs, as such you would just make the additive ratio too high, which could only injury your engine.

You would only advantage from oil additives if you buying the cheapest engine oil possible and don’t change it in time, yet even if you would do that, it would virtually be cheaper come buy better quality engine oil in the an initial place.

See more: Name The Noble Gas Which Noble Gas Has The Highest First Ionization Energy ?

Conclusion

The 5.9 Cummins is a trusted engine that isn’t also picky on engine oil, however, that doesn’t typical that you can obtain away through buying the cheapest ingredient you can discover – it’s a heavy-duty workhorse ~ all.

The all at once best an option will constantly be what her truck’s designers recommend and in this case – it’s Valvoline’s Premium Blue. It’s a artificial motor oil that has very low volatility and low ash content, i beg your pardon is the most important requirement because that the 5.9 Cummins.

But if for some factor you don’t desire to use Valvoline’s Premium Blue, any type of motor oil from this list would work an extremely well too.