The 2020 Dodge Charger, particularly models equipped with the 5.7L or 6.4L HEMI engines, can develop oil leaks from the engine oil cooler assembly. This component helps maintain optimal oil temperature but has gaskets and connections that can fail over time.
Oil Cooler Function and Location
The HEMI oil cooler is a heat exchanger mounted to the engine block, typically using coolant to regulate oil temperature. Engine oil passes through the cooler where it exchanges heat with coolant, keeping oil at optimal operating temperature. The cooler mounts with gaskets and has oil and coolant line connections.
Common Failure Points
Oil leaks from the cooler assembly commonly originate from the gasket between the cooler and engine block, O-rings on oil line connections, the cooler housing itself due to corrosion or impact damage, and internal failure allowing oil and coolant to mix. The gasket sees extreme temperature variations and degrades over time, eventually allowing oil to seep past.
Symptoms to Watch For
Look for oil accumulation around the oil cooler mounting area, drips from under the engine front or side, oil level dropping without visible external leak elsewhere, possible coolant contamination if internal cooler failure occurs, and oil pressure warning lights if significant leakage reduces oil volume. The leak often appears as fresh oil on an otherwise clean area.
Diagnostic Approach
Clean the oil cooler area thoroughly to remove existing contamination. Run the engine to operating temperature and inspect for fresh oil seepage. Check line connections by attempting slight movement while watching for oil weeping. Pressure test the cooling system to check for internal cooler failure. Verify oil and coolant are not mixing by inspecting both fluids for contamination.
Repair Options
External gasket leaks require removing the oil cooler, replacing the gasket, and reinstalling with proper torque. Line connection leaks need O-ring replacement. Internal cooler failures mandate complete cooler replacement. Always replace gaskets with Mopar OEM parts for proper fit and heat resistance. Refill with specified oil quantity and verify no leaks after repair. Labor can be significant due to cooler accessibility.