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How To Save Money Changing Oil & Filters On Jeep 3.0 Liter Ecodiesel

Writer: Muddy Ruttzz
Muddy Ruttzz
Jul 29, 2024
8 min read

Updated: Sep 1

Affiliate Disclosure: This post is unsponsored, I don't take products for free to do reviews on them. To support the studio, I use affiliate links from Amazon and eBay. If you click and purchase, I may earn a small commission at no extra cost to you.

By Muddy Ruttzz


TL;DR: Quick Summary

  • Massive Cost Savings: Get a complete 4-filter OEM-quality kit (oil, fuel, engine air, cabin air) from Doc's Diesel for roughly the price of a single dealership oil filter.

  • Strict Oil Specs: The 3.0L EcoDiesel requires 9 quarts of 5W-40 Full Synthetic meeting Chrysler MS-12991 / API SN specifications.

  • Fuel Filter Routine: Save up to $400 in dealer labor by replacing the fuel water separator filter yourself at every oil change interval.

  • Quick DIY Routine: All four essential filters can be swapped quickly with basic hand tools to keep your EcoDiesel running clean and lasting longer.


What You Will Learn In This Post

Maintaining your Jeep Wrangler JL or Gladiator 3.0L EcoDiesel does not require expensive dealership visits once your complimentary service runs out. In this guide, you will discover how to handle complete DIY filter maintenance at home while saving hundreds of dollars. We cover how to source a cost-effective, OEM-quality 4-filter kit and select the exact MS-12991 spec 5W-40 synthetic oil required to keep your engine protected.


You will also get a clear, step-by-step walkthrough for changing all four critical filters: engine oil, fuel, engine air, and cabin air. We dive deep into the often-overlooked fuel water separator replacement—a service dealers charge up to $400 to perform—and explain why swapping it every oil change is vital for diesel longevity.


Finally, you will learn practical workshop tips to avoid messes and prevent costly mistakes. From locating the correct filter housings and using the right socket sizes to properly torquing drain plugs and keeping trail-ready spare parts on hand, this guide gives you the practical knowledge needed to service your EcoDiesel with confidence.



https://youtu.be/jKou5YknrUM
📺 Watch the Video: The video and this article are best when used together. Watch the step-by-step video above on the Muddy Ruttzz YouTube Channel!

Maximize Your Savings: DIY Ecodiesel Oil & Filters Change

Buy a new Jeep, you receive three complimentary oil changes. This service includes an oil and filter change along with a tire rotation. After our Gladiator used up our 3 services, it was my turn to handle the maintenance. I decided that Doc's Diesel Filters was the ideal choice for meeting the Jeep's maintenance requirements.

Doc's Diesel Filters are 3rd party tested for performance and meet or exceed OEM standards.

Jeep engine bay with Doc’s Diesel air, oil and fuel filter boxes neatly arranged under the open hood.
Doc's 4 Filter Maintenance Kit

Oil, Fuel, Engine Air & Cabin Air Filters Change in 6 Minutes

In my video I show how to do this maintenance quickly and easily. This article is a follow up stressing that I rely on Doc's Filters to keep the process economical and still use high quality OEM quality filter products.

The Doc's 3.0 Liter Ecodiesel 4 Filter Kit - Oil, Fuel, Air, Cabin Air Filter. Get them all at once and from the same place saves you lots of time and effort.


Save the hassle of hunting down individual part numbers. The Complete Doc's 3.0L EcoDiesel 4-Filter Maintenance Kit (Oil, Fuel, Air & Cabin) gives you all four essential service filters in a single, convenient package.


Doc's Diesel Ecodiesel Filter Kit consisting of a oil filter, engine air, fuel filter, and cabin air filter.
All The Filters Your Vehicle Needs To Keep Systems Working Way They Should

Doc's Diesel Are OEM Quality: You Can Be Confident In Using Them For Your Ecodiesel Oil & Filters Change

For the price of one Oil Filter from the Jeep Dealer, I purchased four Doc's Filters. It's crucial to remember that the engine air, fuel, and cabin air are frequently overlooked. Doc's offers a convenient and cost-effective solution to address all these filters simultaneously.


Jeep Gladiator with hood open and 3.0 Liter Ecodiesel engine in view. 9 quarts of Pennzoil are sitting in the engine compartment.
Oil Is The Lifeblood Of The Engine And It Is Critical To Use The Correct Spec

Jeep Ecodiesels Require 9 Quarts Specific Spec Oil

I've used both Amsoil and the Pennzoil shown in the image above. Both oils are 5w-40 Full Synthetic and meet Chrysler's MS-12991 API SN Specifications. It is crucial to use oil that meets this specification when changing the oil and filters in your Ecodiesel.

Pennzoil Platinum Euro 5W-40 Full Synthetic meets the strict MS-12991 and API SN specifications required for the 3.0L EcoDiesel engine.



Box containing Doc's Oil Filter with a background of diesel fuel pumps and text saying "Changing Oil Filter And Engine Oil."
Doc's Filters Are OEM Quality At A Economic Price

Here Is How I Change The Oil Filter And Engine Oil


Man laying under vehicle using ratchet wrench to remove a oil pan drain plug. There is a large green plastic pan positioned to catch the oil when it comes out.
Removing The Oil Drain Plug

Man laying under Jeep watching oil drain from the Jeeps oil pan and into a large green plastic pan.
The Jeep Holds 9 Quarts Of Oil - It Comes Out Fast So Make Sure You Have A Large Deep Pan To Catch It


Looking inside the Jeeps engine compartment at the 3.0 Liter Ecodiesel motor. The oil filter location is pointed out with a circle and a arrow.
Oil Filter Is Located Here On Driver's Side Of Gladiator And Wrangler JL Ecodiesels

The Jeep Ecodiesel engine compartment showing a rag located under the oil filter. When filter is removed rag wil collect oil that is spilled out.
I Place A Rag To Contain Drips And Spills When I Remove The Oil Filter
Inside the engine bay of the Ecodiesel motor using a ratchet wrench to remove the oil filter. There is a Doc's Engine Air Filter sittin on the top of engine.
27 mm Socket And Extension Make It Easy To Remove The Oil Filter
Looking inside the Ecodiesel engine bay while man holds up old oil filter he just removed.
Old Oil Filter Gets Properly Disposed Of.

Ecodiesel Oil Filter Mount with oil filter removed and residual oil pooled in it.
Residual Oil Left In The Oil Filter Mount That Will Be Soaked Up With A Rag
A Ecodiesel Oil filter looking at the 2 O Rings that are needed to seal the oil filter.
The New Oil Filter - Make Sure O Rings Are Present

Related Content

Putting fresh clean oil on the O Rings of the new oil filter prior to installation of the new oil filter in the 3.0 liter Jeep Ecodiesel engine.
Oiling The O Rings On The New Oil Filter

Installing the new oil filter in the engine of the 3.0 liter Jeep Ecodiesel Motor using a socket with a extension and a Torque Wrench. Filter requires 25 newton meters and ther is a Doc's Diesel Air Filter sitting on top of the motor also.
Oil Filter Is Installed And Torqued To 25 Newton Meters
A oil drain plug held in a man's hand. This plug gets installed in the oil pan of the Jeep.
Oil Drain Plug Gets Torqued To 33 Foot Pounds

Congratulations! Oil Change Complete!


You only need the oil filter? Have it your way! Hit the button.

Critical Maintenance Often Overlooked - The Fuel Filter

I show you exactly how easy it is to perform this critical Fuel Filter change.



Box with Doc's Fuel filter inside sitting on a background of green diesel fuel pumps.
Don't Listen To The Manual-Change Your Fuel Filter At Every Oil Change


The Dealer Can Charge As Much As $400.00 To Change Your Fuel Filter

The fuel filter for the Jeeps Ecodiesel is designed as a Fuel Water Separator Filter. The housing containing it features a petcock. If the "Water In Fuel Light" indicator illuminates, you will need to open the petcock to drain the water. It is advisable to replace the filter more often than what the manual suggests. By using Doc's Diesel Filters, it is cost-effective to do this with every oil change.



Driver side of Gladiator with running board and a drain pan sitting on the driveway.
Fuel Filter Is Located On Drivers Side Of Gladiator Just Behind The Door And Underneath On The Frame
Under the Jeep Gladiator looking at the skid plate that protects the fuel filter. A drill motor is being used to remove the screws that hold it on.
Fuel Filter Protected By This Skid Plate
Fuel Filter housing on the Jeep Gladiator. It has a petcock that is for draining water that may get in fuel.
Fuel Filter Is Under The Fuel Filter Housing - The Housing Contains A Petcock For Draining Water in Fuel

The Petcock Allows For Draining Water If Your "Water In Fuel Warning Light" comes on


A bottle held under the petcock of the fuel filter housing collecting fuel prior to changing the filter.
Draining Fuel Prior To Removing The Fuel Filter Housing

Draining Fuel Cuts Down Mess When Removing Housing

Diesel fuel is nasty! Make sure you wear your gloves, safety glasses, and have a good container for catching residual fuel. Proper disposal is a must!


A socket and wrench are being used to remove the fuel filter housing. It unthreads and is removed to access the fuel filter.
A Socket Is Used To Unscrew The Fuel Filter Housing To Remove And Change The Filter

Fuel filter has been removed and is draining on a drain pan and the new filter is being shown.
Housing And Old Filter And New Filter - Note How The Filter Is Installed

The inner mechanism of the Jeep Gladiator Ecodiesels Fuel Water Separator Filter.
Fuel Is Filtered And Water Separated Here

A new fuel filter being inserted into the fuel water separator on a Jeep Gladiator Ecodiesel.
New Filter Snaps Into Place Easily


New fuel filter is colored green and is full inserted and locked int to the fuel water separator mechanism.
New Fuel Filter In Place


Fuel filter housing and used fuel filter sitting on a tool cart. The old filter has been removed.
Old Fuel Filter Removed From The Housing
Fuel filter housing with new O ring installed. Oil is being applied to the O ring to protect it during installation.
Doc's Diesel Provides New O Ring That Has To Be Installed In The Housing

Fuel Filter Housing Cap: Keep A Spare On Hand

One thing I like about plastic parts is when they thread into metal. If a part gets cross threaded its likely the plastic gets ruined instead of a oil filter or fuel filter housing.

There are some parts folks who go remote should carry and I like to carry a extra fuel filter and the Fuel Filter housing. Those extra parts are an insurance policy to help you if you get stranded in the middle of nowhere.


Using a ratchet wrench to install the fuel filter housing on the Jeep Gladiator Ecodiesel.
Housing With New O Ring Being Installed

Reinstall Housing Tighten Till PetCock Lines Up Properly


Congratulations! You Changed Your Ecodiesel Fuel Filter!

Air Filter Change Is The Easiest Of These Maintenance Items

Its easy but still important. Airflow is critical to all motors but even more so to a diesel. Air filters for the Ecodiesel were hard to find a few years ago but not anymore. Just a click away with Doc's.



Doc's Diesel Air Filter in a box.
Doc's Diesel Air Filter - OEM Quality At A Reasonable Price

Under the hood of the Jeep Gladiator Ecodiesel looking at the housing that surrounds the engine air filter.
Air Filter Is Located Under Here

Engine air filter housing removed exposing the old air filter allowing it to be removed.
Remove 4 10 mm Screws To Remove The Old Filter

Engine air filter housing is opened up and a new air filter is being installed in the Gladiator Ecodiesel.
Simple But Very Important Maintenance

Tightening 4 10 mm screws that hold the engine air filter in.
Take It Easy With The Impact Drill Not To Strip The Screws

Congratulations! You Have A New Air Filter Installed!

Cabin Air Filter Is Often Neglected But A Very Easy Maintenance Item

As a HVAC Guy (retired) I have seen a lot of neglected filters. I live in the desert and most of my Overlanding is done there. It is dusty and the cabin air filter gets dirty fast. You may not even have thought of it. Out of sight, out of mind. Heres how you change it out. Easy but important.



Doc's Cabin Air Filter for the Jeep Gladiator Ecodiesel.
A Clean Cabin Air Filter Makes The AC More Efficient

Glove Compartment on a Jeep Gladiator Ecodiesel being removed to allow for access to remove old cabin air filter and install a new one.
Cabin Air Filter Is Behind The Glove Compartment


The small door that encloses the cabin air filter and holds it in on a jeep gladiator ecodiesel.
Remove This Small Door

Removing the old dirty cabin air filter on a jeep gladiator Ecodiesel.
Neglected And Very Dirty Cabin Air Filter

Sliding the 2nd of 2 part cabin air filter into the filter rack in the jeep gladiator ecodieseel.
New Cabin Air Filter Is 2 piece making it easier to install


Small Door that holds the cabin air filter in is replaced after installing new filters on the Jeep gladiator ecodiesel.
Replace The Small Door

Cabin Air Filters Are Replaced Glove Compartment Goes Back In

Despite being frequently overlooked, this filter becomes heavily soiled due to the continuous influx of outside air into the vehicle, resulting in an inefficient AC system.


Conclusion: Rigs Run Better And Last Longer

Why Change Your Filters?

Changing your filters every 5,000 to 7,500 miles helps keep your diesel engine running smoothly and efficiently for a long time. Think of it like giving your engine a spa day—who doesn't want to feel refreshed and rejuvenated?

DIY Maintenance Made Easy

Using all-in-one 4-filter kits makes it easy and affordable to do this maintenance yourself at home. It’s like a buffet for your engine—just grab everything you need and dig in! Plus, you get to impress your friends with your newfound mechanic skills. Just remember, if you start talking to your engine, it’s time to step away from the tools and take a break!


About the Author

Muddy Ruttzz is a digital creator, overlander, and DIY builder documenting rugged vehicle builds and outdoor adventures. Backed by a career in industrial sheet metal fabrication, heavy infrastructure construction, and mechanical maintenance, he provides practical, trade-tested technical guides for real-world off-road performance.

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