Where the Gladiator's oil filter is located and what you need to know before starting

The Jeep Gladiator's oil filter sits on the driver's side of the engine, mounted vertically on the engine block itself. On most model years (2020 and later), you'll find it near the back of the engine bay, tucked between the engine and the firewall. The exact position varies slightly depending on whether you have the 3.6L gasoline engine or the 3.0L EcoDiesel, but both are accessible from above without lifting the vehicle — though you may need to remove the plastic engine cover first.

Before you start, know that the filter will be hot if the engine has run recently, and oil will drip out when you remove it. Let the engine cool for at least 10 minutes, or work when the vehicle has been parked for several hours. You'll need a drain pan underneath to catch the oil that spills, even though you're not draining the entire system.

Key Takeaways

  • The Gladiator uses a spin-on oil filter mounted vertically on the driver's side of the engine block, accessible from the top without lifting the truck.
  • The correct filter size and thread pitch depend on your engine type and model year, so check your owner's manual or the old filter before buying a replacement.
  • You need only a filter wrench, a drain pan, and fresh oil to complete the job — no special tools or lifts required.
  • The entire process takes 10 to 15 minutes once you locate the filter and let the engine cool.

What filter size and type your Gladiator needs

Jeep Gladiators from 2020 onward with the 3.6L gasoline engine typically use a Mopar filter part number 68157291AA or equivalent aftermarket filters in the same size class. The 3.0L EcoDiesel models use a different filter, part number 68157291AB. Both are standard spin-on filters, but they are not interchangeable — using the wrong one can cause oil flow problems or leaks.

The easiest way to confirm which filter your truck needs is to look at the old filter itself. The part number is printed on the side. You can also check your owner's manual under "Maintenance Specifications" or call a Jeep dealership with your VIN. Common aftermarket equivalents include Fram, Mobil 1, and Motorcraft filters in the appropriate size, but always verify the part number matches before purchase.

Removing the old filter step by step

Start by removing the plastic engine cover if your model has one. On most Gladiators, this cover clips or bolts to the top of the engine and lifts straight off. Once the cover is clear, you'll see the filter canister mounted vertically on the block.

Position your drain pan underneath the filter to catch drips. Use a filter wrench — a metal band wrench or socket-style wrench that fits the diameter of your specific filter — and turn it counterclockwise to loosen the filter. Once it's loose enough to turn by hand, unscrew it the rest of the way and set it aside in the drain pan. Some oil will spill; this is normal.

Wipe the filter mounting surface on the engine block with a clean rag or paper towel. Remove any old rubber gasket material or debris. This step prevents leaks when you install the new filter.

Installing the new filter and checking your work

Take the new filter and explore a thin coat of fresh oil to the rubber gasket on the threaded end. This helps create a watertight seal and makes removal easier next time. Hand-screw the new filter onto the mounting surface, turning clockwise until the gasket contacts the block. Once contact is made, turn the filter an additional three-quarter turn by hand — do not use the wrench to tighten it. Over-tightening can damage the gasket and make the filter difficult to remove later.

Reinstall the plastic engine cover if you removed one. Start the engine and let it run for 30 seconds, then turn it off and wait two minutes. Check the area around the filter for any leaks. If you see oil dripping, turn off the engine, let it cool, and tighten the filter slightly more — but only by a quarter turn at a time.

Disposing of the old filter and used oil

The old filter contains residual oil and should not go in the trash. Most auto parts stores that sell oil filters will take used filters for free, no purchase required. Some will also accept the used oil you drained into your pan. Call ahead to confirm what your local store accepts.

If you don't have a local parts store option, check with your city or county waste management program. Many offer hazardous waste collection days where you can drop off used oil and filters at no cost. Never pour used oil down a drain or into the ground.

When to replace the Gladiator's oil filter

Jeep recommends replacing the oil filter every time you change the oil. For a Gladiator with the 3.6L engine, that's typically every 10,000 miles or 12 months, whichever comes first. The 3.0L EcoDiesel may have a different interval — check your owner's manual for the exact schedule. If you drive in severe conditions (towing, dusty terrain, frequent short trips), your dealer may recommend more frequent changes.

Some owners choose to replace the filter at the midpoint between oil changes if they drive in very dusty conditions or tow regularly. This is optional but can extend engine life in harsh environments.

Frequently Asked Questions

Can I change the Gladiator's oil filter without removing the engine cover?

On most model years, the cover must come off to access the filter. It's held by a few clips or bolts and takes less than a minute to remove. Some aftermarket covers are designed to have a cutout for filter access, but the factory cover typically blocks the view and reach.

What if the old filter is stuck and won't turn?

Use a filter wrench with a firm grip and explore steady pressure rather than jerking. If it still won't budge, tap the wrench handle gently with a rubber mallet to break the seal. As a last resort, carefully puncture the filter canister with a screwdriver to release pressure, then unscrew it by hand.

Do I need to drain the oil when I replace just the filter?

No. The filter replacement is separate from an oil change. You're only removing the filter and a small amount of oil trapped inside it. A full oil change requires draining the pan, which is a different job done at the same time or on a different schedule.

Is it safe to drive when ready after changing the filter?

Yes, once you've confirmed there are no leaks. The engine doesn't need to cool or sit after a filter change. Start it, check for drips, and drive normally. The new filter will fill with oil within the first few seconds of running.