Mishimoto 2021+ Jeep JL Rubicon 392 Silicone Oil Cooler Hose

Stop the Failure Before It Starts

The factory oil cooler hose on the 2021+ Jeep Wrangler JL Rubicon 392 cracks and collapses at the bend, a well documented failure point where OEM rubber splits under the repeated heat cycling the 6.4L 392 V8 generates in trail and low speed use. The Mishimoto Silicone Oil Cooler Hose (MMHOSE-392-21OC) replaces the factory hose with a single continuous silicone piece engineered to hold its shape through the bend, eliminating the failure mode at its source rather than patching around it.

Key Features

• Direct replacement for the failure prone factory oil cooler hose on the Rubicon 392
• Smooth internal taper eliminates the pressure pockets and flow restriction created by the factory plastic joiner
• Embedded fiber reinforcement resists expansion and collapse under sustained pressure and heat
• Single continuous silicone construction removes the OEM step change where the original hose splits
• Worm gear clamps included for a secure, field serviceable connection at each end
• Backed by the Mishimoto Lifetime Warranty

This Part Fits

Specifications

What's Included

• 1x Mishimoto Silicone Oil Cooler Hose
• Worm gear clamps

About Mishimoto

Mishimoto designs and engineers performance cooling components in house, from silicone hoses to radiators and oil coolers, with a focus on solving the specific failure points that stock parts run into under real driving conditions. Every hose kit is built and tested to outlast the OEM part it replaces.

FAQ

The MMHOSE-392-21OC is a Mishimoto silicone oil cooler hose built as a direct replacement for the factory hose on the 2021+ Jeep Wrangler Rubicon 392, addressing the known cracking and collapse failure at the hose bend.

The OEM rubber hose splits at its bend under repeated heat cycling from the 6.4L 392 V8, a failure mode documented in factory service bulletins for this platform.

No. The MMHOSE-392-21OC is a direct fit replacement and installs with no drilling, cutting, or modification required.

The hose ships with worm gear clamps for a secure connection at each end.

This is the replacement hose only. It does not include an oil cooler core, sandwich plate, or fittings.

The MMHOSE-392-21OC is covered by the Mishimoto Lifetime Warranty against manufacturing defects.

Yes, the hose routes along the factory path and is not affected by suspension lift height.

No. The MMHOSE-392-21OC is engineered specifically for the 2021+ Rubicon 392 6.4L V8 oil cooler routing and is not designed for other JL powertrains.

Install Instructions

1. Park on a level surface and allow the engine to cool completely before starting work
2. Disconnect the negative battery terminal
3. Locate the factory oil cooler hose at the point where it connects near the oil cooler and water pump
4. Loosen the worm gear clamps on the factory hose and remove it
5. Inspect the mating surfaces and clean away any residue or debris
6. Slide the new Mishimoto silicone hose onto the connection points
7. Position the included worm gear clamps over each connection point
8. Tighten the clamps evenly to secure the hose without overtightening
9. Reconnect the negative battery terminal
10. Start the engine and inspect the connection points for leaks before returning to normal driving