Motor oil is the lifeblood of her engine, giving lubrication and also cooling to a facility system of quick moving mechanical parts under far-ranging load. Routine oil changes ensure that old, damaged down engine oil is replaced before it loser its chemical and mechanical properties, for this reason maximizing protection against wear. Company intervals vary between 12v, 24v, and also 24v usual rail Cummins engines (see schedule below). Always follow the manufacturers said oil readjust interval and adhere to the different "severe duty" schedule if you accomplish 1 or more of the requirements.

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5.9L Cummins Engine Oil

All 5.9L Cummins turbodiesels (6BT and also ISB) attribute a 12 quart oil capacity (with filter change) and also share the exact same oil filter. Engine oil have to be changed per the oil change interval chart listed below using the proper viscosity noted in the applicable chart below. Overfilling or underfilling the crankcase may an outcome in oil aeration and also compromised oil pressure. Constantly verify oil level on dipstick after running engine and allowing to cool because that 15 minutes (oil in the peak of the engine should drain ago into the crankcase prior to checking oil to fill level). Neither Cummins no one Chrysler introduce the usage of a supplemental oil additive in 5.9L diesel engines. A high quality, synthetic engine oil is encourage for all engines. Constantly fill the oil filter with around 1 quart of clean engine oil prior to installing, i m sorry will assist prevent dry starts and also ensure oil press builds easily after an altering the oil.

5.9L Cummins Oil readjust Intervals

Severe company conditions incorporate towing, hauling, steering in stop-and-go traffic, taking frequent short trips, operating in warm weather, operating in exceptionally cold weather, and frequent durations of extreme idling; constantly following the service interval that uses to your operation conditions. Most vehicles will fall under the severe service category, unless your van is provided for the sole function of commuting and your path sees limited city driving.

Model Years

Normal business Interval

Severe business Interval

1989 - 1998 (6BT, 5.9L Cummins 12v)

6,000 miles/6 months

3,000 miles/3 months

1998.5 - 2002 (ISB, 5.9L Cummins 24v)

7,500 miles/6 months

3,750 miles

2003 - 2007 (ISB, 5.9L Cummins 24v)

15,000 miles/6 months

7,500 miles/6 months

5.9L Cummins Oil readjust Parts list

Fleetguard is Cummins" service parts brand and also is the encourage replacement oil filter for every Cummins turbodiesels; prevent cheap aftermarket filters. Replace the engine oil pan drain plug as soon as the edges of the head start to show signs the wear or the gasket creates a leak. Change the oil fill cap as soon as it starts to show signs of destruction to stop particles/pieces native dislodging and also falling into the crankcase.


Part Number

Engine oil filter

Fleetguard FL16035 (all 5.9L Cummins)

Oil pan drain plug

1989 - 1993

MOPAR 4293859

1994 - 2002

MOPAR 4778578

2003 - 2007

MOPAR 05080631AB

Engine oil fill cap

1989 - 1998

Cummins 4962608

1998.5 - 2007

Cummins 3973511

1989 - 1998 5.9L Cummins Oil Viscosity graph (12 valve)

Ambient Temperature Range

Oil Viscosity

Greater 보다 10° F

SAE 15W-40

0 - 30° F (w/ out utilizing engine block heater)

SAE 10W-30

Less 보다 0° F (must usage engine block heater)

SAE 10W-30

Less than 0° F (w/ out utilizing engine block heater)

SAE 5W-30

1998.5 - 2002 5.9L Cummins ISB Oil Viscosity graph (24 valve)

Ambient Temperature Range

Oil Viscosity

Greater 보다 10° F

SAE 15W-40

0 to 30° F (w/ out making use of engine block heater)

SAE 10W-30

-10° F come 30° F (must usage engine block heater)

SAE 10W-30

-10 to 0° F (must usage engine block heater)

SAE 5W-30

2003 - 2007 5.9L Cummins ISB Oil Viscosity chart (24 valve, usual rail)

Ambient Temperature Range

Oil Viscosity

Greater than 0° F

SAE 15W-40

All temperatures

SAE 5W-40 complete synthetic


Diesel Hub recommends the following Amsoil assets for Dodge ram models equipped v the 5.9L Cummins turbodiesel:

Amsoil Max Duty Signature series 5W-40 diesel oil Premium cold weather oil for maximum engine protection

Amsoil fabricated engine oil offer:

• exceptional protection versus fuel dilution and also oil consumption

• remarkable resilience versus thermal, mechanical, and chemical breakdown of engine oil

• improved oil flow and also engine protection in sub-zero temperatures and also during cold starts

Amsoil is a leading manufacturer of synthetic oils and also lubricants, consisting of a line of engine oils engineered to fulfill the stringent demands details to diesel engines.

Synthetic engine oil is premium in every way, shape, and form than typical petroleum based engine oils. Fabricated motor oil attributes a significantly greater resistance to thermal breakdown, chemical breakdown (contamination indigenous fuel dilution and also exhaust soot), and also mechanical break down (shear). The is backwards compatible through ALL engines nevertheless of age and also type.

5.9L Cummins Engine Oil adjust Procedures

Note: 1994-1998 design year Cummins 6BT featured in steps below

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• Park the vehicle, collection the parking brake, and allow the engine to cool because that ~ 1 hour before changing the motor oil.

• place a suitable drain pan (minimum 12 quart capacity) below the engine oil pan drainpipe plug.

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• eliminate the drain plug and enable the oil to drain. As soon as the engine oil has actually drained completely, reinstall the drainpipe plug. Install drainpipe plug snug; perform not overtighten. If the drainpipe plug seal is jeopardized it should be replaced.