You are right at the stated service interval for a coolant service for the 3.6 Pentastar engine (10 years or 150,000 miles)

The process is outlined below (copied from Google, just so you're aware)

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A 3.6L Pentastar coolant flush involves draining the old fluid via the radiator petcock (passenger side), flushing with distilled water, and refilling with Mopar Antifreeze/OAT Coolant (typically purple or orange). Essential steps include using a spill-free funnel to bleed air from the system, as these engines are prone to air pockets.

Preparation: Ensure the engine is completely cool.
Drain System: Locate the petcock (drain valve) on the passenger side of the radiator and open it to drain into a bucket. Remove the radiator cap to speed up the process.

Flush (Optional but Recommended): Close the petcock, fill the system with distilled water, run the engine until warm, then drain again once cooled. Repeat until the drained water is clear.

Refill: Fill the radiator slowly with a 50/50 mix of Mopar OAT coolant and distilled water, or pre-diluted coolant.

Bleed/Burp Air: With the coolant funnel attached to the radiator, run the engine with the heat on high, revving to ~3,000 RPM intermittently to purge air bubbles.

Monitor Levels: Replace the cap and run the car, checking the overflow tank for the next few days to ensure it stays at the proper level.

Coolant Type: The 3.6L Pentastar requires OAT (Organic Additive Technology) coolant, usually dyed purple or orange, and should not be mixed with older HOAT (hybrid) coolants.

Total Capacity: The system typically holds around 3.5 gallons, though a standard drain may only remove about 2 gallons.
Safety: Dispose of used coolant properly at an auto parts store or recycling center.

Video covering the coolant service process for 3.6 Pentastar

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Posted by Jimbeaux

Member since Sep 2003

21582 posts

Posted on 1/22/26 at 9:28 am to RolltidePA

quote:
Bleed/Burp Air: With the coolant funnel attached to the radiator, run the engine with the heat on high, revving to ~3,000 RPM intermittently to purge air bubbles.

Definitely be diligent about the air bleed/burp. Dodge trucks are known to have overheating issues if the air isn’t bled out well.

I had an older model Dodge Truck that had a bleeder valve at the top of the engine near the return hose fitting. Took me a while to figure out why the truck kept running hot until I found it.

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