Jeep Wrangler JK 3.6L Pentastar Oil Change Guide (2012 to 2018): Capacity, Filter, Interval, and the Reset

A 2012 to 2018 Jeep Wrangler JK with the 3.6L Pentastar V6 takes 6 US quarts (5.6 liters) of engine oil with a new filter, and the filter is a paper cartridge in a housing on top of the engine, not a spin-on can underneath. The owner's manual calls for API certified SAE 5W-20 meeting FCA Material Standard MS-6395 on 2013 to 2018 models (the 2012 manual says 5W-30). Warm the engine, drain the pan, swap the cartridge and its O-ring, refill, check the dipstick five minutes after shutdown, then reset the indicator: key ON without starting, accelerator to the floor three times within 10 seconds, key OFF.

In this article

• Make sure you have the right engine
• Capacity, oil grade, and spec by model year
• The cartridge filter and the 2014 part change
• Tools and supplies
• Step by step
• Resetting the oil change indicator
• How often: the indicator vs a fixed mileage
• Known oil-related bulletins for the JK Pentastar
• What to do with the used oil and filter
• Frequently asked questions

Make sure you have the right engine

This guide covers the 3.6L Pentastar V6 in the JK from the 2012 model year through the end of JK production in 2018. It does not cover the 2007 to 2011 JK, which used the 3.8L V6 with a spin-on filter. For the record, the 2011 owner's manual lists the 3.8L at 6 quarts (5.7 liters) with filter and SAE 5W-20; the capacity is close, the procedure is not.

It also does not cover the JL Wrangler, which overlapped with the JK for 2018. The JL's 3.6L is a different revision: the 2018 JL owner's manual calls for SAE 0W-20 and only 5 quarts (4.73 liters) with filter. If you are not sure which 2018 you own, the JK vs JL guide sorts it out, and the oil filler cap is a tell on its own: Jeep prints the grade on the cap, and every manual says to refer to it.

Capacity, oil grade, and spec by model year

Every JK manual from 2012 through 2018 lists the same engine oil capacity for the 3.6L; the grade changed once, between the 2012 and 2013 manuals, and the 2016 and 2018 JK manuals carry the same figures.

Six quarts is the fill with a fresh, dry filter; treat the sixth quart as something you add toward while reading the dipstick. Any brand with the API mark and the MS-6395 approval on the bottle qualifies; one without both the mark and the correct SAE grade, in the manual's words, "should not be used."

The cartridge filter and the 2014 part change

The Pentastar's filter is a paper cartridge that drops into a housing (Chrysler calls it the Oil Filter Adapter) in the valley between the cylinder heads, under the engine cover. A threaded plastic cap closes the housing, and a new O-ring for the cap comes in the box with the Mopar filter kit, which is listed as a cartridge 2.15 inches across and 6.20 inches long.

Here is the part quick-lube counters get wrong. Chrysler changed the filter adapter for 2014, and the element changed with it. Service bulletin 09-003-13, "Pentastar Engine Oil Filter Application Reference," gives the split:

The bulletin's language is as strong as Chrysler gets: the two designs "are not interchangeable," and "Failure to install the correct oil filter WILL result in permanent engine damage." It also says to use only the O-ring in the filter package, because reusing the old one "WILL result in leakage and possible OFA damage." Buy by model year and compare the new element to the old one. The 68191349AC kit is still what Stellantis specifies for the 3.6L filter and cap O-ring in its 2025 oil leak bulletin, which warns that some aftermarket kits do not seal the cap.

Tools and supplies

• 6 quarts of API certified, MS-6395 approved oil in the grade on your filler cap (5W-20 for 2013 to 2018; 5W-30 for 2012).
• The correct Mopar cartridge filter for your model year, with its O-ring.
• A drain pan that holds at least 7 quarts.
• A socket and ratchet for the drain plug, and a six-point socket that fits the hex on the filter cap. The cap is plastic; twelve-point sockets and open-end wrenches round it.
• A torque wrench. The drain plug and cap values are in the dealer service manual, not the owner's manual, so this article does not quote them.
• Ramps, or a floor jack plus jack stands. The owner's manual is explicit: "Do not get under the vehicle when it is on a jack." The supplied jack is for tire changes only.
• Wheel chocks, a funnel, gloves, shop towels, and a sealed container for the used oil.

Step by step

1. Warm the engine, then shut it down. Warm oil drains faster and carries more contaminants out. Park on level ground, set the parking brake, chock the rear wheels, and let the exhaust cool.
2. Raise and support the front. Ramps, or a floor jack and jack stands under the axle tubes. Shake the Jeep before you crawl under it.
3. Remove the engine cover and loosen the filter cap a couple of turns. This lets the oil in the housing drain into the sump instead of onto the engine when you pull the cartridge. Do not remove the cap yet.
4. Drain the pan. Drain pan under the plug on the bottom of the oil pan, back the plug out, and finish by hand with upward pressure so it comes away in your fingers. Let it drain to a drip. Wipe the plug and inspect its sealing washer.
5. Reinstall the drain plug. Thread it in by hand until it seats, then tighten with the torque wrench to the service manual value. The owner's manual does not publish that figure and this article will not invent one; without it, snug the plug firmly with a short ratchet and stop.
6. Remove the filter cap and cartridge. Unscrew the cap the rest of the way and lift it straight up with the old cartridge attached, rag underneath. Pull the element off the cap.
7. Replace the O-ring. Pry the old one off the cap with a plastic pick, not a screwdriver, wipe the groove, and seat the new one from the filter box, wetted with a drop of fresh oil. Bulletin 09-003-13 says to use only the O-ring that came with the filter.
8. Install the new cartridge. Compare it to the old one first. Press the element onto the cap, lower both into the housing, thread the cap on by hand, then tighten with the six-point socket to the service manual value. The plastic cap needs to seat its flange on the housing, and no more.
9. Refill. Pour in 5 quarts through a funnel, pause, then add the last quart slowly. Replace the filler cap and the engine cover.
10. Start, check for leaks, and read the dipstick. Idle the engine while you watch the cap and drain plug, then shut it off. The manual's procedure is to check the level "five minutes after a warmed up engine has been shut off," on level ground, and keep it in the SAFE zone; one quart (0.95 liters) takes the reading from the bottom of the SAFE zone to the top. Overfilling and underfilling both, the manual warns, "will cause aeration or loss of oil pressure."
11. Lower the Jeep and reset the indicator.

Resetting the oil change indicator

The JK tracks oil life by duty cycle, not mileage, and the "Oil Change Required" message (or "CHAngE OIL" in the odometer window on clusters without the EVIC display) returns at every key cycle until you reset it. The owner's manual procedure is identical from 2012 through 2018:

1. Turn the ignition switch to the ON position. Do not start the engine.
2. Fully push the accelerator pedal slowly three times within 10 seconds.
3. Turn the ignition switch to the LOCK (off) position.

Start the engine. If the message comes back, the reset did not take, and the manual says to repeat it. The usual causes are starting the engine instead of stopping at ON, or pedal strokes that do not reach the floor. Pushing the MENU button only hides the message until the next key cycle. No scan tool is needed. A walk-through for the JK, JL, Gladiator, and Grand Cherokee is in the Jeep oil change light reset guide.

How often: the indicator vs a fixed mileage

The manual's position is that the indicator is the schedule. It watches operating conditions (short trips, towing, extreme heat or cold) and can call for a change "as early as 3,500 miles (5,600 km) since last reset," with service due "within the next 500 miles (805 km)." Then it sets a ceiling that applies whether or not the light ever comes on.

A JK that sees regular trail miles and dust fits the manual's own definition of severe duty. For a pavement daily driver, trusting the indicator and respecting the cap is exactly what the manufacturer asks. The manuals also tie a checklist to every oil change: rotate the tires and inspect the battery terminals, brakes, cooling hoses, exhaust, and air filter. The DIY Jeep maintenance guide works through those.

Known oil-related bulletins for the JK Pentastar

Three manufacturer bulletins filed with NHTSA matter here. None is a safety recall.

• Filter mismatch, 2012 to 2014 (TSB 09-003-13). Covered above.
• Oil loss and oil pooling in the valley, 2014 builds (TSB 09-008-15). For 2014 JKs built on or before January 20, 2014, Chrysler told technicians that complaints of oil loss or oil weep should start with a check for oil pooling under the lower intake, beside the filter housing, because the valley "may hold almost a quart of oil and not show any signs of oil weeping." The check is a long wooden dowel pushed down next to the housing; about 10 mm of oil on the tip points to a filter housing that needs replacing. A little oil there right after an oil change is normal drip from the filter swap.
• Left cylinder head, 2012 and early 2013 (TSB 09-002-14 and Warranty Bulletin D-14-12). Not an oil issue, but the best known Pentastar bulletin. For 3.6L engines built on or before July 25, 2012, Chrysler extended the left cylinder head warranty to 10 years or 150,000 miles from the in-service date for valve guide and seat wear that shows up as a misfire on cylinders 2, 4, or 6. That window has closed for nearly every affected Jeep, but the cause is on record.

Shopping for a used JK instead? The Jeep parts that fail at 100,000 miles article covers the broader wear list.

What to do with the used oil and filter

The owner's manual says to contact a dealer, a service station, or a government agency for where used oil and filters "can be safely discarded in your area." The EPA's used oil page fills in the rest: the oil from a single change can contaminate one million gallons of fresh water, so it never goes in the trash, a storm drain, or the ground. Pour it into a leak-proof container with a cap, do not mix it with anything else, and take it to a collection point; many auto parts stores accept it, and the EPA links the Earth911 and American Petroleum Institute locators. On filters, the EPA says that "if properly drained, they can be safely recycled or disposed," so let the old element drain while you finish the job and ask the collection point whether they take filters.

Frequently asked questions

How much oil does a Jeep Wrangler JK 3.6L take?

6 US quarts (5.6 liters) with a new filter, per every JK owner's manual from 2012 through 2018. Fill 5 quarts, run the engine briefly, wait five minutes, and add the rest until the dipstick reads in the SAFE zone. The 2018 JL takes 5 quarts.

What oil does a 2012 to 2018 Jeep Wrangler use?

API certified SAE 5W-20 meeting FCA Material Standard MS-6395 for 2013 to 2018; the 2012 manual lists SAE 5W-30. The 2014 to 2018 manuals allow MS-6395 5W-30 when 5W-20 is not available. Synthetic is fine if it carries the same certification.

Do 2012 to 2013 and 2014 to 2018 Wranglers use the same oil filter?

No. Chrysler bulletin 09-003-13 lists 68079744AC for 2012 to 2013 and 68191349AA (now the 68191349AC kit) for 2014 and later, and warns that the wrong one "WILL result in permanent engine damage."

How do you reset the oil change light on a Jeep Wrangler JK?

Key to ON without starting the engine, press the accelerator slowly to the floor three times within 10 seconds, then key to LOCK. If the message comes back on the next start, repeat it. This is the owner's manual procedure for every JK from 2012 to 2018.

How often should a 3.6L Wrangler get an oil change?

When the indicator says so, which can be as early as 3,500 miles, and never past 10,000 miles or 12 months on 2013 to 2018 models (8,000 miles or six months on 2012). The 2014 to 2018 manuals add a 4,000-mile severe duty interval for dusty, off-road use.

Can you skip the torque wrench on the drain plug and filter cap?

You can do the job without one, but do not guess at the values; they are in the dealer service manual. Snug the drain plug firmly with a short ratchet and seat the plastic cap until its flange meets the housing. Over-tightening is the common failure on both.

Related reading on this site: how to reset the Jeep oil change light, DIY Jeep maintenance, how to tell a JK from a JL, and Jeep parts that fail at 100,000 miles.