RAM 6.7 Cummins Engine Oil
CES 20081 / CES 20086 Spec, Viscosity & Drain Intervals
The RAM 6.7 Cummins requires CK-4 oil meeting Cummins CES 20081 (older) or CES 20086 (current). Primary viscosity: 15W-40 or 10W-30. FA-4 not approved. The 6.7 Cummins in RAM 2500/3500/4500/5500 trucks uses the same Cummins B6.7 engine as many medium-duty commercial trucks. AMSOIL Signature Series Max-Duty (DME) and Heavy-Duty (ADP) both carry CES 20086 approval.
Displacement
6.7L
Horsepower
370–420 hp
Torque
800–1,075 lb-ft
Oil Capacity
~12 qt / 12.3 qt
OEM Spec
CES 20081 / 20086
Primary Grade
15W-40
Generation Overview
The 6.7 Cummins B6.7 has been in RAM trucks since 2007 across multiple generations:
- 2007–2012: 350–385 hp, CES 20081
- 2013–2018: 370–385 hp, CES 20081/20086
- 2019+: 400–420 hp, CES 20086
All generations: CK-4 oil, 15W-40 primary. CES 20086 oil satisfies CES 20081 — upgrade without issue.
The Cummins Connection
The B6.7 in RAM trucks is the same engine family used in:
- Freightliner M2 106
- International MV/HV Series
- Kenworth T370
- Peterbilt 220/548
Same spec, same oil. Fleet managers running mixed equipment (RAM work trucks + medium-duty commercial) can standardize on one CK-4 CES 20086 product across the entire fleet.
High Output vs Standard
RAM offers a High Output 6.7 Cummins producing 1,075 lb-ft of torque. The oil spec is unchanged — CES 20086, CK-4, 15W-40. Higher output does not change the oil requirement. Use the same product across standard and High Output variants.
| Variant | Torque | Oil Spec | Primary Grade |
|---|---|---|---|
| Standard Output | 800–850 lb-ft | CES 20086 / CK-4 | 15W-40 |
| High Output | 1,075 lb-ft | CES 20086 / CK-4 | 15W-40 |
Drain Intervals
- RAM OEM recommendation: 15,000 miles with Mopar CK-4 oil
- With AMSOIL full synthetic: 15,000–20,000 miles standard
- Extended drain with oil analysis: Up to 25,000 miles documented
RAM’s OEM 15,000 mile drain interval is one of the longest in the pickup truck segment. AMSOIL CK-4 synthetic meets and exceeds the requirements for this interval.
Recommended AMSOIL Products
Signature Series Max-Duty
AMSOIL DME — 15W-40
Full synthetic CK-4. CES 20086 approved. Maximum protection for high-torque Cummins applications and extended drain intervals.
Heavy-Duty Diesel
AMSOIL ADP — 15W-40
Full synthetic CK-4. CES 20086 approved. Cost-effective solution for standard to extended drain intervals on the B6.7.
Frequently Asked Questions
What oil does the RAM 6.7 Cummins take?
CK-4 meeting Cummins CES 20081 or CES 20086. Primary grade 15W-40. FA-4 not approved. 10W-30 CK-4 is also acceptable per Cummins in applicable climates.
How often should I change oil on a 6.7 Cummins?
RAM’s OEM recommendation is 15,000 miles with qualifying CK-4 oil. With AMSOIL full synthetic, 15,000–20,000 miles is standard. Oil analysis supports longer intervals up to 25,000 miles.
Is the RAM 6.7 Cummins the same engine as in commercial trucks?
Yes. The Cummins B6.7 in RAM 2500/3500/4500/5500 is the same engine family used in Freightliner M2, International MV, and medium-duty Kenworth and Peterbilt trucks. The oil specification is identical.
What is the oil capacity of the RAM 6.7 Cummins?
Approximately 12 US quarts with filter for 2500/3500. 4500/5500 chassis is approximately 12.3 quarts. Always verify via dipstick — capacity can vary by model year and configuration.