Two engines were available in the 2020 Gladiator, and they need different oils. If your Gladiator has the 3.6L V6, use 0W-20 synthetic oil. If you have the 3.0L EcoDiesel, use 5W-40 synthetic oil. Gasoline engines typically take about 6 quarts of oil, while the EcoDiesel requires roughly 7 quarts. Always confirm with the owner's manual or your dealer for the exact specification and capacity for your vehicle.
Engine options and official oil specs
Gasoline: 3.6L Pentastar V6
The following information covers the standard oil requirements for the gasoline-powered Gladiator with the 3.6L engine.
- Oil type and viscosity: 0W-20 synthetic motor oil
- Oil capacity: 6 quarts (5.7 L) with filter
- Oil specifications: Meets API SN Plus and ILSAC GF-6 (or newer) requirements
- Recommended brands (examples): Mopar, Castrol EDGE 0W-20, Pennzoil Platinum Full Synthetic, Mobil 1
These specifications align with Stellantis recommendations for the 3.6L Pentastar in the Gladiator and other modern FCA platforms. Using a true full‑synthetic 0W‑20 helps with cold-start performance and fuel efficiency, and it supports long service intervals when driving conditions are normal.
Diesel: 3.0L EcoDiesel V6
The following information covers the diesel-powered Gladiator with the 3.0L EcoDiesel engine.
- Oil type and viscosity: 5W-40 synthetic motor oil
- Oil capacity: approximately 7 quarts (6.6 L) with filter
- Oil specifications: API CK-4 (or CK-4/SN) and ACEA C3 compatibility
- Recommended brands (examples): Mopar 5W-40, Shell Rotella T6 5W-40, Total Quartz 5W-40, Mobil 1 ESP Formula 5W-40
Diesel oils engineered for modern clean-diesel engines typically meet CK-4 (or CK-4/SN) standards and ACEA C3. Many owners opt for a high‑quality 5W‑40 synthetic that provides good protection across temperature ranges and helps protect diesel emissions systems.
Maintenance notes and intervals
Oil change intervals depend on engine type, driving conditions, and the vehicle’s oil life monitoring system. In general, gasoline Gladiators (3.6L) are commonly serviced around 7,500 miles under normal driving, while EcoDiesel models may follow different intervals based on duty cycle and dealer recommendations. Always rely on the vehicle’s oil life monitor and the schedule in your owner's manual. If you drive under severe conditions (extreme temperatures, heavy towing, lots of short trips), expect more frequent changes.
Summary
The 2020 Jeep Gladiator requires two different oils depending on the engine. The 3.6L gasoline engine uses 0W-20 synthetic oil with a 6-quart capacity, while the 3.0L EcoDiesel uses 5W-40 synthetic oil with about a 7-quart capacity. Use oils that meet the appropriate API/ACEA specifications and follow the owner's manual or oil-life monitor for service intervals. Always confirm the exact specification and capacity for your specific vehicle with the manual or a Jeep service adviser.