Oil Change — Pentastar 3.6L Full Procedure

Use 6 quarts of 5W-20 full synthetic and a 76mm cartridge filter. Drain plug torques to 20 ft-lb on a fresh crush washer; the plastic filter cap torques to 18 ft-lb (25 Nm). Total job runs 30–60 minutes.

The 3.6L Pentastar that arrived in JKs for 2012 uses a top-mount cartridge filter — a plastic cap on top of the engine, not a spin-on canister underneath. This is the part most owners coming from the 3.8L V6 or a different platform get wrong on their first change.

Oil spec. Mopar calls for 5W-20 meeting MS-6395. Any quality full synthetic with an API SN or SN+ rating works — there's no advantage to running OEM-branded oil. Capacity is 6 US quarts with filter change. Overfilling past the upper mark on the dipstick can cause the crankcase pressure to push oil into the intake through the PCV system, which causes long-term carbon issues on the intake valves (Pentastars are direct-injected and already prone to this).

Filter. The cartridge filter sits in a plastic housing on top of the engine, behind the throttle body. Use a 76mm 14-flute cap socket — the housing cracks if you use channel locks or a strap wrench because the plastic gets brittle after heat cycles. Mopar 68191349AC is the OEM filter and includes a new O-ring. Wam-Auto and FRAM CH11665 are functional equivalents.

Drain plug. 13mm hex on the oil pan, passenger side. Torque is 20 ft-lb on a fresh crush washer — don't reuse the old washer; they're a dollar each and a leak means redoing the job.

Steps

1. Warm the engine for 2–3 minutes to thin the oil, then shut it off.
2. Remove the engine cover (pull straight up — friction fit).
3. Loosen the oil filter cap one turn to break the seal so oil drains into the housing before you remove the pan plug. This keeps the cap area cleaner.
4. Position drain pan under the oil pan plug. Remove the 13mm plug. Let drain 5+ minutes.
5. Remove the filter cap completely, lift out the old cartridge. Wipe the housing with a clean rag.
6. Pull the old O-ring off the cap. Install the new O-ring (lubricate with fresh oil). Snap the new cartridge into the cap.
7. Reinstall the cap. Torque to 25 Nm (18 ft-lb). Do not overtighten — the plastic threads strip.
8. Install drain plug with new crush washer. Torque to 20 ft-lb.
9. Pour in 6 quarts of 5W-20 synthetic through the cap. Start the engine; verify oil pressure light goes out within 3 seconds.
10. Shut off, wait 5 minutes, check level on dipstick. Top off if needed but do not overfill.

Why it works

• Top-mount filter — no crawling under the truck
• Standard 13mm drain plug
• Common parts at any auto parts store
• 30-60 minute job once you've done it

Trade-offs

• Plastic filter housing cracks easily — must use cap socket
• Stripped cap threads require housing replacement (~$80 part)
• Filter cap location means oil drips down the engine if you don't loosen it before pulling the drain plug

Tools required

• 13mm socket
• oil filter cap socket (76mm, 14-flute)
• drain pan (6+ quart)
• torque wrench (in-lb capable)
• floor jack and stands (optional)
• shop rags

Parts

Part	Vendor	Est. price
5W-20 full synthetic oil (6 quarts)	Mopar / equivalent SN+ rated	~$32
Mopar oil filter (cartridge)	Mopar	~$9
Drain plug crush washer	Mopar	~$1

Sources

• FCA 2012-2018 JK Wrangler service info — 3.6L Pentastar oil capacity and spec
• Pentastar 3.6L filter housing torque spec (25 Nm / 18 ft-lb)

Related

• Serpentine Belt Replacement — 3.6L
• Transfer Case Fluid Change — NV241 / NV271
• All Jeep Wrangler JK guides & tools
• Browse the full DIY database

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Written and maintained by an AZ wheeler and driveway wrencher. Always cross-reference your factory service manual — modifications affect vehicle safety and warranty. Work at your own risk.

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