Challenger Supercharger Maintenance: What Needs Service and When
The Hellcat's 2.4L supercharger is surprisingly low-maintenance — but it's not maintenance-free. Here's what to do and when.
The Roots Supercharger: Built-In Reliability
The twin-screw Roots-type blower on the Hellcat, Redeye, and Demon is designed to last the life of the engine with minimal service. The blower rotors run on a sealed oil bath — there's no external oil circuit to maintain.
Supercharger Oil
The 2.4L blower contains approximately 80–100ml of supercharger oil in the rotor case. This oil lubricates the rotor bearings and the timing gears.
Mopar recommendation: Check the supercharger oil level every 60,000 miles or if you notice any unusual noise from the blower.
Supercharger oil type: Mopar Supercharger Oil (MS-6395) — a specific synthetic oil. Do not substitute with engine oil or transmission fluid.
Service procedure: The fill/check plug is on the side of the blower housing. Remove the plug, check that oil is at the bottom of the hole. Add if necessary. This is rarely needed unless a seal has leaked.
Supercharger Drive Belt
The Hellcat's supercharger drive belt is separate from the serpentine belt. It drives directly from the crank to the blower pulley.
Inspection interval: Every 30,000 miles or annually for track cars.
Replacement: Inspect for cracking, fraying, or rib wear. The stock belt is typically replaced at 60,000–80,000 miles under normal conditions. Track cars with pulley upgrades (higher boost = more belt slip stress) should inspect more frequently.
Important: A broken supercharger belt means no boost, significantly reduced power, and potential for oil starvation if the supercharger relies on the belt-driven oil pump.
What Can Go Wrong
Blower bearing noise: A high-pitched whine that changes pitch under boost. Separate from the normal supercharger whine. Indicates a bearing beginning to fail — address promptly.
Boost leaks: A hissing sound under boost indicates an intercooler hose or inlet seal leaking. Common on high-boost builds. Use a boost leak tester (compressed air through the intake with the engine off) to locate.
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