Why is my Jeep Gladiator 3.6 leaking oil around the oil filter?

Short answer: On the Gladiator 3.6, oil in the valley almost always means the oil filter/cooler adapter seals or housing. Replace the adapter with good seals before you chase a rear main.

Symptom: Oil smell, oil on the valley under the intake, low oil level, or drips near the oil filter housing on a 3.6 Pentastar Gladiator.

What to check first

1. Look for oil pooling in the valley behind the oil filter cap.
2. Wipe it clean, drive a short loop, and see where it returns.
3. Ask the shop to use Mopar or Fel-Pro seals, not the cheapest kit seals.
4. Replace intake gaskets if the intake has to come off.

Likely causes

1. Oil cooler / filter adapter seals. The most common leak is the oil cooler/filter adapter on top of the 3.6. Oil pools in the valley behind the filter cap.
2. Cracked plastic housing. Some housings crack. Many owners switch to a revised Mopar housing or an aluminum aftermarket unit with good seals.
3. Over-tightened filter cap or wrong seals. Overtightening the cap or using poor aftermarket seals can start a leak even on a good housing.

What it usually costs

Parts are moderate; labor is the bigger bill because the intake often comes off. Aluminum upgrade housings cost more up front.

Is it safe to keep driving?

A small seep can wait a few days. A heavy leak that drops the oil level is not safe—top off and fix it soon.

DIY or shop?

Experienced DIYers do this job; most owners use a shop because of the intake removal.

Recalls, bulletins and complaints in plain words

• Related recalls: NHTSA lists these recalls touching this area of the Jeep: 22V767000 (2021-2022 model years, fuel system, gasoline:delivery:fuel pump); 23V263000 (2021-2023 model years, fuel system, diesel:delivery:fuel pump); 24V572000 (2021-2021 model years, power train:manual transmission:control module:software). Check your VIN at nhtsa.gov/recalls. If your car is part of a recall, the dealer fixes it for free.
• Plain words: The complaint count below shows how often owners reported problems that mention these words to NHTSA. A count is not proof of a defect.
• NHTSA complaints: 87 keyword-matched complaints for Jeep Gladiator 2020–2024 (of 979 unique complaints queried, NHTSA complaints API by model year, queried 2026-11-06; keywords: oil, leak, filter, cooler, housing). This counts complaints that mention these words. It is not a defect finding.

What owners report

• In Penstar 3.6 liter oil filter housing leak and engine valve issues on Reddit r/JeepGladiator, an owner reported the classic Pentastar oil filter housing leak.
• In What would cause a leak like this? on Reddit r/JeepGladiator, an owner posted photos of oil where the cooler/filter adapter sits.
• In oil filter housing on Reddit r/JeepGladiator, owners compared housing replacements and seal kits.

Quick tip

If oil is sitting in the valley by the filter, do not start with a rear main guess—pull the cooler adapter first.

Vehicle focus: Jeep Gladiator 3.6 Pentastar roughly 2020-2024.

Safety / mechanic note

Low oil from a ignored leak can damage the engine. Verify with a mechanic.