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

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Now, even though the 5.9 Cummins likes to note its territory by leaking oil means too often, it’s tho a good engine and also should outlive your truck’s frame and also body. Assuming that you act it properly with regular oil alters and an excellent quality fabricated motor oil, that is.

But i beg your pardon engine oil need to you use? Is there anything certain that you need to look out for when buying diesel engine oil?

Well, stick roughly because that’s specifically what fine be talking around in this article, but before we review the five best oils because that the 5.9 Cummins, here’s one oil viscosity chart to assist you made decision the ideal viscosity for her 5.9 Cummins:

5.9 Cummins Oil Capacity and 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 with high ash content could produce deposits on valves and ultimately lead to guttering and valve burning. The preferably sulfated ash contents of 1.85 fixed % is encourage for all 5.9 Cummins 12 and also 24 valve engines.

Make sure you gain the appropriate grade engine oil for her ambient temperature range:

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

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

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 to -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 come 10° F SAE 10W-30
0° F to -10° F (with block heater)SAE 10W-30
Below 0° F (without block heater)SAE 5W-30 Synthetic

Note: constantly consult her vehicles owners hand-operated for the ideal oil requirements and also recommendations.

The 5 ideal Oils because that 5.9 Cummins

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Lubrication & protection

Delvac 1300 supervisor 15W-40 is a high-performance fabricated blend diesel engine oil designed come be offered in every heavy-duty applications, consisting of marine. The meets or over the needs for API CK-4 and also older, an interpretation that it’s compatible and also recommended for use in diesel engines v the recent emissions manage systems and also older diesel engines, choose the 5.9 Cummins.

Its man-made composition offers outstanding oxidation stability, definition that it won’t thicken, type nasty deposits, and lose every one of its properties as quick as traditional diesel engine oils. The also means that the Delvac 1300 super 15W-40 is qualified of expanded oil drainpipe intervals that assist the setting and additionally your wallet because you won’t have actually to change the oil on her 5.9 Cummins together often.

Delvac 1300 at sight 15W-40 stays liquid in cold weather to offer your engine smooth starts and immediate protection to your valvetrain, bearings, and other an essential lubrication points.

Additive ingredient

The special base oil technology, through hydro-processed base stocks and an excellent additive package, allows the Delvac 1300 at sight 15W-40 come resist excessive oil consumption and also corrosive and also abrasive wear.

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

Compatibility

Delvac 1300 super 15W-40 was occurred in participation with the biggest engine manufacturers and also is as such approved for Volvo VDS-4.5 and 4, Renault RLD-3, MB 228.31, man 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 above the demands of Cummins CES 20086 and more.

Things to Consider before Buying Engine Oil because that the 5.9 Cummins

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

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

Viscosity has constantly been and also will proceed to be the most crucial factor when choosing motor oil. It affects heat generation and also wear, governs the sealing impact of engine oil, and determines exactly how much power it will require to start and also keep an engine running under assorted temperature conditions.

Viscosity is a measure of the oil’s resistance to flow and also it’s directly impacted by the temperature of the oil, whereby its viscosity to reduce with increasing temperature and vise versa. This is one of the reasons why engines room harder to start in freeze temperatures.

To make oil viscosity simpler to understand for the buyer, the culture of Automotive designers (SAE) occurred a scale for motor oil viscosity ratings referred to as oil grade. It’s explained in one easy-to-understand, but thorough way by The fix Specialist in this video:


The engineers at Cummins invested painstaking hrs testing different grade motor oils in order to discover what functions best. They took RPM, clearances between moving parts at various temperatures, and also countless other components into consideration, therefore, it’s extremely necessary to usage the ideal grade motor oil that they recommend.

Conventional vs man-made Oil

There room a number of reasons why artificial oil is much better than conventional however that doesn’t mean that you must only be using synthetic.

Synthetic motor oils have a natural capability to maintain similar viscosity throughout temperature changes. They nothing thicken as lot in freeze temperatures, thus they perform better in cold temperatures and also especially – the an initial seconds after ~ startup where many engine wear in reality occurs. Alongside far better protection against wear, synthetic oils mitigate the quantity of power that is needed to start the engine and also keep the running, which rises the effectiveness of the engine and also ultimately gives you better mileage.

And that doesn’t finish there – synthetic motor oil kicks standard oil’s ass in exceptionally high temperatures together well. One of the main disadvantages of standard motor oil is the high volatility.

Nowadays, pretty lot all diesel engines have actually a turbocharger the gets really hot under heavy loads, and also if you shut your engine down and stop the oil circulation while the turbo is pretty lot red hot, the leftover oil within the turbo will start boiling. Typical oil is quite volatile when compared to synthetic, meaning that typical oil “volatilizes” and also “evaporates” easier, leaving deposits that can reduce or fully block oil circulation to the turbo – this is referred to as “turbo coking” and also it’s something friend don’t want to happen to your 5.9 Cummins.

When should You Use traditional Oil?

If not particularly recommended or forced in your vehicle owner’s manual, using traditional motor oil would make sense if you’re brief on cash and your engine isn’t based on freezing temperatures, doesn’t have a turbo or is not operating in extreme conditions.

In the owners manual, extreme problems for the 5.9 Cummins are:

Frequent quick trips whereby your engine does not reach the operating temperature that 190° F.Excessive idling (over 10 minutes) in ~ ambient temperatures lower than 32° F.Frequent towing.Dusty driving conditions.Commercial organization – taxi, police, delivery, etc.Off-road or desert operation.Extensive procedure at high engine RPMs (greater 보다 2900 RPM) and also loads (70% throttle).

However, if your 5.9 Cummins is subjected to these extreme operating problems or if you don’t mind payment a little bit extra to rightfully preserve its longevity, climate full synthetic or semi-synthetic engine oil would absolutely be the best choice you deserve to make for her engine.

Low Ash Content

The only requirement apart native the exactly viscosity for the 5.9 Cummins is to usage low ash engine oil. Designers at Cummins have noticed in the past that high ash contents motor oils would create deposits top top valves come the suggest where valve burn occurs, therefore Cummins recommends utilizing motor oil that has maximum sulfated ash contents of 1.85 mass %. So, as long as you usage API CI-4 certified engine oil, you have to be good to go.

Do I need to include Oil Additives?

No, you need to never usage oil additives if she running an excellent quality engine oil. Many (if no all) API certified engine oils currently have every the additives her engine needs, because of this you would just make the additive ratio too high, which might only harm your engine.

You would certainly only benefit from oil additives if you’re buying the cheapest engine oil possible and don’t adjust it in time, however even if you would execute that, it would nearly be cheaper to buy much better quality engine oil in the an initial place.

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Conclusion

The 5.9 Cummins is a reputable engine the isn’t too picky top top engine oil, however, that doesn’t median that girlfriend can get away with buying the cheapest ingredient you can discover – it’s a heavy-duty workhorse after all.

The all at once best selection will always be what her truck’s designers recommend and also in this situation – it’s Valvoline’s Premium Blue. It’s a synthetic motor oil the has an extremely low volatility and low ash content, i m sorry is the most necessary requirement because that the 5.9 Cummins.

But if for some factor you don’t want to usage Valvoline’s Premium Blue, any kind of motor oil native this list would work really well too.