What Is the Hayden Oil Cooler Kit?

The Hayden Oil Cooler Kit is an aftermarket thermal management system designed to lower engine oil temperatures during high-stress driving. For the Dodge Challenger Hellcat — a supercharged monster producing 707 to 840 horsepower stock — heat is the primary enemy of consistent performance. The kit integrates a fin-and-tube heat exchanger, mounting hardware, and hoses to route oil through a dedicated cooling loop, shedding excess thermal energy before the oil returns to the pan.

Unlike a simple air-to-oil cooler, the Hayden kit uses a high-efficiency core that maximizes surface area without adding excessive weight. It is engineered to work with the Hellcat’s existing oil filter adapter, making it a relatively direct upgrade. However, “direct” doesn’t always mean foolproof, as we’ll explore in the sections ahead.

Why Oil Cooling Matters on the Hellcat

The Hellcat’s 6.2-liter HEMI V8 generates immense heat through forced induction. Under extended full-throttle pulls, track sessions, or even spirited highway merging, oil temperatures can spike past 280°F. At those levels, the oil’s viscosity drops, protective additives break down faster, and the risk of bearing wear or piston scuffing increases. The stock oil cooler — a small water-to-oil unit integrated near the oil filter — does a decent job for daily driving but quickly becomes a bottleneck when the Hellcat is pushed hard.

Adding a dedicated air-to-oil cooler like the Hayden kit creates an additional thermal capacity margin, pulling heat away from the oil before it ever reaches the engine’s critical components. This is especially valuable for owners who track their cars, run drag strips, or live in hot climates.

Detailed Pros of the Hayden Oil Cooler Kit

1. Consistent Performance Under Load

When oil temperatures stay under 220°F, the Hellcat’s engine management system can advance timing and maintain peak boost more aggressively. The Hayden kit helps stabilize oil temps during repeated hard accelerations, reducing heat soak and power fade. Many owners report that after installation, their quarter-mile times become more repeatable because the engine isn’t pulling timing to protect itself.

2. Extended Engine Life

Lower oil temperature reduces thermal stress on seals, gaskets, and the oil itself. By slowing oxidation and maintaining film strength, the cooler minimizes wear on the supercharger bearings, valve-train components, and the crankshaft. For a car that can cost $80,000 to $100,000, protecting the engine with a $300–$500 cooler is a cheap insurance policy.

3. Easy Installation for DIYers

The kit includes pre-made hoses with crimped fittings, a sandwich-style oil filter adapter, and a bracket set. Most mechanically inclined owners can complete the job in an afternoon using basic hand tools. Detailed instructions and online video walkthroughs make the process even more accessible.

4. Cost-Effective Upgrade

Compared to a full aftermarket cooling system or an upgraded radiator, the Hayden oil cooler is budget-friendly. At around $150–$200 for the kit, it offers a high performance-per-dollar ratio. It also pairs well with other cooling upgrades like a larger intercooler or electric radiator fan.

5. Potential for Improved Towing Safety

While most Hellcat owners don’t tow, the car is rated for up to 1,000 pounds when properly equipped. If you use your Hellcat to haul a small trailer to the track, the added oil cooling capacity keeps transmission and engine temps more manageable under load.

Detailed Cons of the Hayden Oil Cooler Kit

1. Overcooling Risk in Cold Weather

In winter or after a cold start, the cooler can keep oil below the ideal operating temperature for too long. Oil that never reaches 190°F can contain condensation and fuel dilution, promoting sludge and emulsification. Some owners install a thermostat-controlled bypass or a low-temperature oil cooler cover to mitigate this issue.

2. Installation Snags on Modified Cars

If your Hellcat has an aftermarket bumper, intercooler piping, or aftermarket supercharger, finding a clear path for the hoses and mounting location can become tricky. The kit’s brackets are sized for the stock front bumper support, and modifications may require custom fabrication or relocating the cooler to the side of the radiator core.

3. Space and Aesthetics

The cooler is about 10×12 inches and needs to be mounted in a place with good air flow — typically in front of the radiator or behind the lower grille. On a Hellcat, that area is already crowded with the intercooler, A/C condenser, and auxiliary fans. Some owners end up losing the fog lamps or cutting the lower grille mesh, which can affect the car’s appearance and resale value.

4. Added Maintenance Points

An external oil cooler introduces two additional hose connections and a core that can leak or get damaged by road debris. You’ll need to inspect the cooler periodically for bent fins, rock strikes, and fitting integrity. If you drive your Hellcat in areas with heavy gravel or salt, consider installing a protective mesh screen.

5. Warranty and Dealer Relations

Although the Magnuson-Moss Warranty Act protects consumers from blanket warranty denials due to aftermarket parts, a dealership can still deny a specific claim if they can prove the part caused damage. Oil coolers are generally low-risk, but some Hellcat owners have reported pushback from dealers when submitting warranty claims on the engine after installing a non-factory oil cooler. Always keep your original parts and be prepared to revert to stock if a major warranty issue arises.

Installation Considerations: Tips and Common Mistakes

Choosing the Mounting Location

The most common spot is the lower left side of the front bumper opening, just behind the active grille shutters. If your car has the Track Package (which includes a secondary heat exchanger), you’ll have less space. Some owners mount the cooler vertically on the rear of the auxiliary radiator bracket, while others fasten it to the crash bar with custom brackets. Whichever location you choose, ensure the cooler sits at least 1–2 inches away from the radiator or intercooler to allow ambient air to pass through its fins.

Hose Routing and Clearances

The supplied hoses are 3/8-inch or -8 AN equivalent. Route them away from the exhaust manifolds, wastegate actuators, and the drive belt. Use nylon zip ties or P-clamps to secure the hoses to existing wire looms or the frame. A loose hose rubbing against a hot component can fail catastrophically—always double-check clearance with the engine running and wheels turned lock to lock.

Oil Filter Access

The sandwich adapter sits between the engine block and the oil filter, which can push the filter outward. On a Hellcat, this may interfere with the factory oil cooler lines or the lower control arm. Verify that you can still unscrew the oil filter for changes; some owners need a 90-degree filter wrench after adding the adapter.

To prevent overcooling, consider adding an oil thermostat that blocks flow to the cooler until the oil reaches a set temperature (typically 180–200°F). Several manufacturers offer inline thermostatic plates that replace one hose fitting. This addition solves the cold-weather concern mentioned earlier and helps the engine reach operating temperature faster.

Comparison with Other Oil Cooling Solutions

Stock Oil Cooler vs. Hayden Kit

The factory “oil cooler” is actually a water-cooled heat exchanger built into the oil filter housing. It warms the oil quickly during a cold start and cools it moderately under load. Its thermal capacity is limited because it relies on the engine’s coolant temperature, which can also climb during extended hard driving. The Hayden air-to-oil cooler operates independently of coolant temperature, providing a second, much larger heat sink. In controlled tests, the Hayden kit typically lowers peak oil temps by 50–70°F compared to the stock system alone.

Hayden vs. Setrab or Derale Coolers

Setrab and Derale offer higher-end coolers with stacked-plate cores that are more efficient than traditional tube-and-fin designs. They also cost two to three times more. The Hayden kit is an excellent entry-level solution that works well for daily drivers and occasional track use. For dedicated race cars with sustained high-rpm operation, a larger Setrab cooler with a thermostatic fan may be necessary.

Air-to-Oil vs. Water-to-Oil Upgrade

Replacing the stock water-to-oil cooler with an improved water-to-oil unit (like the Improved Racing thermostatic plate) can help, but it still relies on coolant temps. The Hayden air-to-oil cooler offers a more direct temperature drop because it exchanges heat with ambient air, which is almost always cooler than coolant. Combining both types (keeping the stock water-cooled unit and adding the Hayden air cooler) reduces oil temperatures even further during extreme sessions.

Real-World Feedback from Hellcat Owners

On Hellcat forums like Hellcat.org and ChallengerTalk, the Hayden oil cooler receives mixed but generally positive reviews. Users report noticeable drops in oil temperature display readouts after installation, often 15–20°F during highway cruising and 40–60°F during back-to-back dyno pulls. Many comment that the added peace of mind is worth the cost and effort. Criticisms center on fitment issues with 2015–2018 models after retrofitting aftermarket intercooler reservoirs, and a few cases of the cooler core being dented by road debris within the first year of ownership.

One common tip from long-term owners: after installing the kit, change your oil sooner than usual (around 2,000 miles) to flush out any debris that may have entered during the hose cutting and fitting process. Also, use a high-quality full synthetic oil with a high flash point, such as 5W-50 or 0W-40, to maximize the benefits of the cooler.

Maintenance Best Practices

  • Inspect fittings quarterly. Check for oil seepage around the sandwich adapter and hose ends. A tiny leak can quickly become a big mess on the downpipes.
  • Clean the cooler core annually. Use a low-pressure hose or compressed air to remove bugs, dirt, and debris from the fins. Avoid using a pressure washer directly on the core, as fins can bend easily.
  • Replace hoses every 3–4 years. Rubber hoses degrade under heat cycles; braided PTFE hoses last longer but still benefit from periodic inspection.
  • Monitor your oil temperature gauge. After installation, note your normal cruising temperature. Any sudden spike above 240°F could indicate a restriction, a stuck thermostat (if equipped), or a cooler clog.

Conclusion

The Hayden Oil Cooler Kit is a practical, cost-effective upgrade for the Dodge Challenger Hellcat that addresses one of the car’s greatest vulnerabilities: thermal management. Its pros — improved performance consistency, engine longevity, easy installation, and low cost — make it a strong contender for any owner who drives aggressively, tracks the car, or lives in a hot climate. The cons — potential overcooling, fitment constraints, added maintenance, and warranty concerns — are manageable with careful planning and minor additional components.

For the majority of Hellcat enthusiasts, the Hayden kit represents a smart investment that brings the car closer to a “track ready” state without breaking the bank. If you prioritize reliability and repeatable power, this cooler deserves a spot on your shortlist.

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