The Chrysler Pentastar V6 engine in the Jeep Gladiator takes 5 Quarts of API Certified SAE 0W-20 Engine Oil which meets FCA MS-6395 standards.
Chrysler recommends oils such as or similar to Mopar, Pennzoil and Shell Helix oil.
The official MOPAR Part Number is 68218950AB and the Global Part Number is 68218950GA.
Here’s a screenshot from page 489 of the 2021 Jeep Gladiator Owner’s Manual:
Best oils for the Jeep Gladiator:
MOPAR official 68218950AB
Mobil 1 Advanced Fuel Economy Full Synthetic Motor Oil 0W-20
Pennzoil Ultra Platinum 0W-20
Valvoline 0W20 Advanced Full Synthetic
How often is Oil Changed?
The Gladiator’s computer measures several variables to determine how often you should change your oil. You should never go over 10,000 miles without changing your oil. Personally, my oil light usually goes off after 6,500 miles. Many Gladiator owners change their oil every 5,000 miles.
How To Reset the Oil Light on the Dashboard:
Resetting the Oil Light Monitor (OLM) on the Jeep Gladiator is easy. Just scroll over to the oil screen and hold “OK” to reset the oil life back to 100%.
But I heard that Pentastar engines take 6 Quarts:
Other vehicles, such as the Dodge Durango, also often equipped with a Chrysler Pentastar V6 engine do indeed take 6 Quarts of oil. The Jeep Gladiator has a much smaller oil pan, offering additional ground clearance. The Jeep Gladiator only accepts 5 Quarts of oil.
A Note on Your Dipstick:
After changing your oil, the user manual recommends running the engine, then letting it sit for at least 5 minutes before checking the oil level on your dipstick. It takes some time for the oil to drain off of the valve train and back down into the oil pan to get an accurate reading. Your dipstick could also show low oil if you’re not parked on a level surface.
What is MS-6395 and does the Jeep Gladiator need it?
In a nutshell, MS-6395 has been tested by Chrysler and meets certain viscosity requirements. Some RAM owners with ECO mode options on their HEMI engines report engine problems after long term use of using an oil which is too thick to work properly in fuel saving modes.
According to Chrysler Group LLC’s official MS-6395 documentation, “the lubricants defined by this standard are engine oils of ILSAC GF-5 quality with additional requirements necessary to protect Chrysler Group LLC engines.”
ILSAC GF-5 quality oil is not hard to achieve these days. Introduced in 2010, According to OilSpecifications.org, ILSAC GF-5 spec oil is “designed to provide improved high temperature deposit protection for pistons and turbochargers, more stringent sludge control, improved fuel economy, enhanced emission control system compatibility, seal compatibility, and protection of engines operating on ethanol-containing fuels up to E85.”