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If you drive a Ram 3500 regularly with heavy loads or frequent towing, keeping oil temperatures under control is essential to protect engine and transmission components. The right oil cooler reduces heat soak and helps maintain stable oil viscosity during extended high-load operation. This guide covers the top shortlisted oil coolers selected for Ram 3500 trucks, with a focus on cooling capacity, installation fit, and long-term reliability. Below you will find the criteria we used to evaluate options and a curated list of seven top picks suited to demanding use.
Top Picks at a Glance
| Best Reviewed A top-rated pick with lots of positive feedback | A-Premium Radiator Assembly with Transmission Oil Cooler for Dodge Ram 1500/2500/3500 (1994–2001) |  |
| Most Popular A crowd favorite that many people choose with confidence | YITHSWAY Aluminum Engine Oil Cooler and Oil Filter Housing Adapter (3.6L) |  |
| Best Quality Built to a higher standard if you want something more solid | Dorman 926-959 Aluminum Engine Oil Filter Housing with Oil Cooler and Filter |  |
| Best Budget The cheapest option that still gets the job done reliably | keriolee Aluminum Engine Oil Cooler with Oil Filter Housing Adapter |  |
| Most Sold A high-volume bestseller chosen again and again | GAOBEN Aluminum Engine Oil Filter Housing with Oil Cooler (926-876 / 926-959) |  |
| Best Value for Money The sweet spot between price and what you get | YITHSWAY Aluminum Engine Oil Cooler and Filter Housing Assembly |  |
| Best Overall The best all-around choice for most situations | TRQ Radiator Assembly with Transmission Oil Cooler for 2013–2018 Ram 2500/3500/4500/5500 6.7L Diesel |  |
1. A-Premium Radiator Assembly with Transmission Oil Cooler for Dodge Ram 1500/2500/3500 (1994–2001)
| Vehicle fitment | Dodge Ram 1500/2500/3500 1994–2001 (gasoline, automatic) |
|---|---|
| Transmission oil cooler | Included |
| Inlet diameter | 1-1/2 inch |
| Outlet diameter | 1-3/4 inch |
| Core thickness | 1-1/4 inch |
This radiator assembly replaces the factory coolant radiator and includes a built-in transmission oil cooler so one unit restores both engine and transmission cooling for older Ram trucks. It is intended as a direct-fit replacement for Ram 1500/2500/3500 models from the mid 1990s to 2001 with automatic transmissions and gasoline engines. The integrated cooler simplifies installation compared with adding a separate aftermarket cooler and helps maintain proper transmission temperatures under towing or heavy-load use. Buyers will appreciate the core dimensions and inlet/outlet diameters that match factory connections to minimize hose modifications. Limitations are that it does not include an engine oil cooler and it is not intended for diesel engines, so diesel Ram owners must look elsewhere. Expect a typical aftermarket build quality that restores cooling function and keeps transmission temperatures in check on daily drivers and light towing duties but verify fit and mounting points before ordering for intensive towing or custom setups.
Best for: Balanced buyers who want a single replacement that restores both radiator and transmission cooling on older Ram trucks without hunting for multiple parts.
Less Ideal for: Owners who operate diesel Rams or those planning heavy-duty towing who need specialized high-capacity transmission coolers or separate engine oil cooling solutions.
- Integrated transmission oil cooler included so one replacement handles both engine and transmission cooling.
- Built to match factory connection sizes to reduce the need for hose adapters or modifications.
- Direct-fit for specified 1994–2001 Ram 1500/2500/3500 models with automatic transmissions, simplifying installation.
- Packaged to arrive protected from shipping damage based on customer feedback.
- Not compatible with diesel engines so it will not fit diesel Ram applications.
- Does not include an engine oil cooler for vehicles that require one separately.
Verdict A convenient one-piece radiator that restores coolant and transmission cooling for older Ram trucks, best for balanced owners who need a straightforward replacement rather than a heavy-duty upgrade.
2. YITHSWAY Aluminum Engine Oil Cooler and Oil Filter Housing Adapter (3.6L)
| Material | Aluminum |
|---|---|
| Thread Size | M16 x 1.5 |
| Product Grade | Replacement Part |
| Automotive Fit Type | Vehicle Specific Fit |
This YITHSWAY assembly replaces the plastic oil cooler and filter housing with a machined aluminum unit intended for Chrysler 3.6L V6 engines. It installs in place of the factory housing and includes the oil cooler, filter, pressure and temperature sensors, gaskets, O-rings and mounting bolts so you can complete the swap without sourcing extra parts. In real-world use the aluminum construction resists heat and warping that commonly causes leaks on the plastic housings, and buyers report straightforward installation and no leaks when properly torqued and sealed. The preinstalled sensors and included filter simplify the job, but you should confirm compatibility with your Ram 3500 3.6L and follow coolant bleeding and torque procedures during installation. Expect a more durable long-term solution than the original plastic housing, though fitment checks and careful sealing are still important to avoid installation issues.
Best for: Risk-averse mainstream buyers who prioritize a durable, maintenance-reducing upgrade over repeated repairs and want a complete replacement kit that minimizes additional parts sourcing.
Less Ideal for: Do not choose this if you prefer dealer-installed factory parts with OEM-backed warranties or if you plan extensive engine modifications that change cooling or oiling requirements.
- Aluminum construction reduces risk of cracking and heat-related warping compared with plastic housings
- Includes oil cooler, oil filter, pressure and temperature sensors, gaskets, O-rings and mounting bolts for a complete replacement
- Machined exterior and reinforced design improves corrosion and heat resistance for longer service life
- Vehicle-specific fit design intended to match mounting points and connections for Chrysler 3.6L applications
- Aftermarket part so installation may require careful comparison to factory part and correct torque procedure
- Manufacturer and long-term durability versus factory-quality parts can vary by unit and driving conditions
Verdict A ready-out-of-the-box aluminum replacement that addresses the common plastic housing leak issue on 3.6L Chrysler-family engines and reduces the chance of repeat repairs.
3. Dorman 926-959 Aluminum Engine Oil Filter Housing with Oil Cooler and Filter
| Material | Aluminum |
|---|---|
| Product Grade | Replacement Part |
| Vehicle Service Type | Car, Truck, Van |
| Automotive Fit Type | Universal Fit |
This Dorman kit replaces the common plastic oil filter housing with a die-cast aluminum unit and includes the oil cooler, filter element, mounting gaskets, cap, and fasteners so you get a one-box repair. It is typically used when the factory housing leaks, cracks, or warps under heat and chemical exposure; installing the aluminum housing helps prevent repeat failures and can restore oil pressure behavior. Built-to-fit design and premium seals aim to reduce future leaks, and the kit updates early fitments to the latest filter cap specification so later sensors and filters work correctly. Practical benefits include fewer future failures compared with plastic housings, fewer parts to buy separately, and a more robust underhood part for heavier-duty use. Important limitations: some users report fitment or machining issues out of the box that require inspection of sensor ports and passageways before startup, and installation can be involved enough that professional installation is recommended for complex engine valleys. Check sensor compatibility and clear all internal passages during installation to avoid pressure or sensor errors.
Best for: Performance-oriented owners seeking a long-term, higher-strength replacement for the Pentastar V6 oil filter housing who prioritize reliability under heavy use and want a complete kit to update early fitments.
Less Ideal for: Budget DIYers who want a direct plug-and-play swap with no inspection or potential modification, or owners unwilling to replace sensors if codes appear after installation.
- Die-cast aluminum construction replaces failure-prone plastic for greater durability
- Includes oil cooler, filter element, cap, gaskets and mounting hardware for a complete repair
- Engineered seals and updated cap design reduce likelihood of future oil or coolant leaks
- Built to match later filter specification so compatible with current sensors and filters
- Some units have required cleanup or drilling of sensor passages out of the box before correct oil pressure is seen
- Does not include oil pressure or coolant temperature sensors which may need replacement separately
- Installation can be time-consuming and may require professional service for tight engine access
Verdict A robust, all-in-one aluminum oil filter housing and cooler kit designed to fix recurring leaks and upgrade early Pentastar V6 vehicles to a more durable, performance-ready setup.
4. keriolee Aluminum Engine Oil Cooler with Oil Filter Housing Adapter
| Material | Aluminum |
|---|---|
| Product Grade | Performance Part |
| Vehicle Service Type | Car, Sports Utility Vehicle |
| Fit Type | Vehicle Specific Fit |
| Compatible Engines | 3.6L V6 (2017–2018) |
This aluminum oil cooler with oil filter housing adapter replaces the original plastic assembly and mounts as a vehicle-specific fit for 3.6L Pentastar V6 engines from 2017–2018. It arrives with a pre-installed oil filter and is intended to keep oil temperatures lower and contamination out of the engine by providing a metal housing less prone to cracking than factory plastic units. Typical use is a like-for-like replacement when the stock housing leaks or fails, and installers report straightforward bolt-on fitment for compatible vehicles. The aluminum construction gives a more durable mating surface and can reduce the risk of repeat leaks when sealing surfaces are cleaned and gaskets are positioned correctly. Some customers note connector fit issues for pressure sensors and a small number report cracked parts out of the box, so careful inspection at installation is advisable. For a budget-focused buyer this offers a clear durability upgrade over plastic housings, but expect to check sensor connectors and seals during installation to avoid fitment surprises.
Best for: Budget-conscious owners seeking a cost-effective, more durable replacement for the factory plastic oil cooler on 2017–2018 Ram 1500 and other 3.6L Pentastar vehicles who prioritize value and straightforward repairs.
Less Ideal for: Drivers who prefer dealer parts coverage, factory-brand components, or need a guaranteed plug-and-play sensor connection should consider OEM or premium alternatives.
- Aluminum housing is more resistant to cracking than original plastic replacements
- Pre-installed oil filter reduces parts to buy and speeds installation
- Vehicle-specific design for 2017–2018 3.6L Pentastar applications simplifies fitment
- Multiple customers report no leaks and improved longevity compared with plastic units
- Some units have arrived cracked or damaged according to user reports
- Oil pressure sensor connector may require modification or different connector on some vehicles
- Included seals in a few reports did not seat correctly during installation
Verdict A budget-friendly aluminum replacement that upgrades durability over plastic housings but requires careful inspection of sensors and seals at installation.
5. GAOBEN Aluminum Engine Oil Filter Housing with Oil Cooler (926-876 / 926-959)
| Material | Aluminum |
|---|---|
| Thread Size | M16 x 1.5 |
| Product Grade | Replacement Part |
| Automotive Fit Type | Vehicle Specific Fit |
This GAOBEN oil filter housing replaces the common plastic factory unit with a machined aluminum assembly that combines the oil filter housing and oil cooler. It is used when the original housing cracks or leaks and is a direct, vehicle-specific swap for models listed by the manufacturer. Notable features include an all-aluminum body to reduce warping and oil leaks, M16 x 1.5 threaded sensor ports, and a packaged kit approach that often includes gaskets and seals. In practice the aluminum construction gives better long-term durability than the plastic housings that commonly fail, and many buyers report straightforward installation and a dry repair that stops leaks. A few buyers had sensor plug fitment differences that required reusing the old sensor or minor adjustments, so expect to verify sensor connectors before final assembly. For Ram 3500 owners with the listed 3.6L fitment, this is a practical, cost-effective upgrade that addresses a known weak point in the factory design while keeping replacement simple for a DIYer or independent shop.
Best for: A practical optimizer looking to fix persistent oil leaks on a Ram 3500 3.6L by installing a more durable, cost-effective metal replacement rather than buying another plastic factory-style unit.
Less Ideal for: Buyers who need a guaranteed plug-and-play drop-in without ever swapping sensors should consider sourcing a housing verified for exact sensor connector matching or consult a dealer alternative.
- Aluminum machined body reduces risk of cracking and oil leaks compared with plastic housings
- Vehicle-specific fit for listed 3.6L applications simplifies installation
- Includes gaskets and seals so fewer additional parts are needed during replacement
- Threaded sensor ports follow standard M16 x 1.5 size for common sensors
- Some units may have sensor plug shapes that differ from the vehicle harness, requiring reuse of the original sensor or minor modification
- Not a direct fit for models outside the listed fitment; confirm exact vehicle compatibility before buying
Verdict A durable, budget-smart aluminum replacement that fixes common oil leaks on compatible Ram 3500 3.6L engines, though check sensor connector fitment before installation.
6. YITHSWAY Aluminum Engine Oil Cooler and Filter Housing Assembly
| Material | Aluminum |
|---|---|
| Vehicle Service Type | Car, Sports Utility Vehicle, Truck, Van |
| Product Grade | Replacement Part |
| Position | Front |
This YITHSWAY assembly replaces the plastic oil cooler/filter housing with a machined aluminum unit designed to stop leaks and improve heat resistance. It arrives as a ready-to-install kit with the oil cooler, filter housing, oil filter, pressure and temperature sensors, O-rings, gaskets, and mounting bolts so a technician can swap the whole assembly in one job. The aluminum construction reduces the risk of warping and cracking that commonly affects plastic housings under heat, which helps prevent oil loss and check-engine lights tied to sensor faults. Several buyers report a direct fit and no leaks when fitted to compatible 3.6L engines, and the included hardware and preinstalled components simplify installation. Limitations to note are the need to confirm exact part replacement numbers and oil filter compatibility for your model year, since some users swap their original filter rather than using the supplied one. Professional installation is recommended if you are not experienced with torque specs and O-ring lubrication.
Best for: Reliability-focused buyers who prioritize a durable, long-lasting replacement to prevent recurring oil leaks and engine sensor faults and who prefer a complete assembly to minimize return trips.
Less Ideal for: Buyers seeking an exact factory-sourced part or those who prefer to reuse their original filter without verifying fitment should consider alternative sources or confirm parts compatibility first.
- Full replacement assembly includes cooler, housing, oil filter, sensors, gaskets, and bolts for a one-step swap.
- Aluminum machined housing is more heat and corrosion resistant than common plastic originals.
- Preinstalled components and included hardware reduce time in the shop and missing-part issues.
- Multiple user reports of direct fit and resolved leaks on affected 3.6L vehicles.
- May require confirming OEM part numbers and swapping to the original oil filter in some years for exact compatibility.
- Aftermarket fitment can vary by model year so installation may need minor adjustments.
Verdict A durable aluminum replacement oil cooler and housing kit that simplifies repairs and reduces the risk of repeat leaks for 3.6L Ram 3500 owners seeking reliability.
7. TRQ Radiator Assembly with Transmission Oil Cooler for 2013–2018 Ram 2500/3500/4500/5500 6.7L Diesel
| Fitment | 2013–2018 Ram 2500/3500/4500/5500 L6 6.7L Diesel |
|---|---|
| Core Material | Aluminum |
| Core Thickness | 1.75 in |
| Core Row Quantity | 2 |
| Transmission Oil Cooler Included | Yes |
This TRQ radiator is a direct-replacement cooling assembly for 2013–2018 Ram 2500/3500/4500/5500 trucks with the 6.7L diesel and includes an internal transmission oil cooler. It installs like a factory-style unit and is typically used to replace a leaking or damaged OEM radiator; the preassembled design and matching inlet/outlet locations reduce the need for modifications during swap-out. The aluminum core and two-row cross-flow design aim to improve heat dissipation while the built-in plated transmission cooler handles transmission fluid cooling without extra plumbing. Practical benefits include straightforward installation for a competent DIYer or shop, the convenience of an assembled unit, and compatibility confirmed for the Ram 6.7L fitment. Limitations to note are the plastic tanks rather than full-metal construction and the radiator does not include hoses, cap, or engine oil cooler, so expect to reuse or replace ancillary parts during installation. Some buyers report occasional shipping or quality-control issues, so inspect the unit on arrival before fitting.
Best for: Buyers who want a balanced, practical replacement that matches factory fitment and makes a Ram 6.7L cooling system repair straightforward without extensive modification.
Less Ideal for: Shoppers seeking a fully metal heavy-duty performance radiator for high-mileage towing or severe-duty use should consider purpose-built aftermarket upgrades instead.
- Direct-fit design for 2013–2018 Ram 6.7L diesel trucks streamlines installation
- Aluminum core and cross-flow layout improve heat transfer compared with older cores
- Integrated transmission oil cooler eliminates separate cooler plumbing in most repairs
- Preassembled unit reduces labor and fitment headaches during replacement
- Plastic end tanks instead of all-metal tanks may be less durable over long term
- Does not include hoses, radiator cap, or engine oil cooler so additional parts may be needed
- Some customers report occasional shipping damage or defective units on arrival
Verdict A practical, direct-fit aluminum radiator with an integrated transmission cooler that simplifies replacing the factory unit on 2013–2018 Ram 6.7L diesel trucks, but it uses plastic tanks and omits hoses and cap.
Choosing the Right Ram 3500 Oil Cooler: Key Factors to Consider
Cooling Capacity
Cooling capacity determines how much heat the unit can remove from circulating oil during prolonged high-load conditions. A higher capacity cooler will reduce peak oil temperatures and slow thermal degradation of lubricants, which matters when towing heavy trailers or during repeated climbs.
Look for rated heat-exchange performance that matches the workload you expect. Undersized coolers can provide little benefit under extreme loads, while appropriately sized units keep oil within safer operating ranges and reduce risk of oil breakdown.
Core Type and Construction
The core design affects heat transfer efficiency, strength, and resistance to blockage. Plate-and-fin cores typically offer high thermal transfer in a compact package, while tube-and-fin designs prioritize robustness and debris resistance.
Materials such as brazed aluminum cores provide good conductivity and corrosion resistance, whereas thicker-walled constructions resist damage from road debris. Consider core design based on where the cooler will be mounted and the balance you need between peak cooling and durability.
Fitment and Mounting
Fitment covers whether the cooler aligns with available space and mounting points on the Ram 3500. Proper mounting reduces vibration stress and ensures adequate airflow through the core.
Assess available clearance, bracket compatibility, and whether the unit requires relocation of existing components. A design with multiple mounting options or adjustable brackets simplifies installation and lowers the chance of interference with other systems.
Connections and Hose Compatibility
Connection type, thread standards, and hose diameter determine how the cooler integrates with existing oil lines. Mismatched fittings can cause leaks or require adapters that add potential failure points.
Verify the cooler’s inlet and outlet sizes and whether included fittings match your vehicle’s lines. Durable hose connections and properly crimped fittings reduce leak risk, and quick-disconnect designs can simplify maintenance and reduce downtime.
Durability and Corrosion Resistance
Durability influences the cooler’s lifespan in harsh road and weather conditions. Salt, moisture, and road debris can degrade components over time, so corrosion-resistant finishes and robust end tanks matter.
Look for protective coatings, anodized or painted finishes, and reinforcement at vulnerable junctions. Units with serviceable components or replaceable cores can extend service life and reduce long-term maintenance needs.
Serviceability and Maintenance
Serviceability affects how easily you can inspect, clean, or repair the cooler without major disassembly. Accessible ports, clear hose routing, and replaceable elements make routine checks and repairs simpler.
Consider whether the design allows flushing, core replacement, or straightforward leak diagnosis. Easier maintenance reduces downtime and helps you keep oil cooling performance consistent over the life of the vehicle.
FAQ
How do I know if my Ram 3500 needs an upgraded oil cooler?
You can often tell by monitoring oil temperature during heavy use. If oil consistently runs hotter than manufacturer-recommended ranges under towing or sustained high-load driving, an upgraded cooler may help. Also consider upgrades if you regularly operate in hot climates or haul heavy loads frequently.
Can I install an oil cooler myself or should I get professional help?
Many owners perform oil cooler installation with moderate mechanical skills, basic tools, and a clear guide. However, because the job involves routing oil lines and ensuring leak-free fittings, professional installation can provide peace of mind and avoid mistakes that cause leaks or improper routing.
Will adding an oil cooler affect oil pressure or flow?
Adding a correctly sized cooler usually has minimal effect on overall oil pressure when installed with compatible fittings and hose diameters. Dramatic pressure changes are uncommon, but using undersized lines or incorrect fittings can restrict flow, so follow fitment guidance and use recommended hose sizes.
What are common signs of an oil cooler leak?
Typical symptoms include oil spots under the vehicle, a noticeable drop in oil level, or oil traces around cooler fittings and hoses. You might also see oil contamination in adjacent systems or a sudden rise in oil temperature if the leak reduces flow.
Is a separate transmission oil cooler necessary for towing?
Transmission cooling needs depend on tow weight and operating conditions. Heavy or frequent towing often benefits from dedicated transmission cooling to maintain lower fluid temperatures. Consider both engine and transmission cooling when towing to protect each system from excessive heat.
How often should oil cooler lines and fittings be inspected?
Inspect lines and fittings at regular service intervals and after any off-road or heavy towing use. Checking for chafing, looseness, corrosion, and visible leaks every few thousand miles helps catch issues early and prevents failures during demanding driving.
How We Chose the Best Ram 3500 Oil Cooler
We tested editorially against real-world demands typical of heavy-duty Ram 3500 owners and prioritized components that matter for sustained performance. Key evaluation criteria included cooling capacity under load to lower operating oil temperature, mechanical fit and mounting options compatible with Ram 3500 chassis and engine layouts, build quality and materials to resist corrosion and vibration, compatibility with existing oil lines and fittings, and ease of installation including clear access to ports and predictable hose routing. We excluded units that required major vehicle modifications, unproven experimental designs, or lacked clear mounting or fitment information for Ram 3500 applications. Emphasis was placed on products offering durable cores, robust fittings, and verifiable heat-exchange ratings so the list favors solutions that balance thermal performance with practical installation for towing and heavy-duty use.
Our full evaluation process is outlined in our review methodology.
Conclusion
Choosing the right oil cooler for a Ram 3500 means balancing cooling capacity, durable construction, and straightforward fitment. Prioritize a unit that matches your towing and load profile, offers secure connections compatible with existing lines, and provides a core design suited to the mounting location. Remember that small tradeoffs exist between peak cooling performance and durability. Focus on reliable materials, serviceability, and correct installation to get consistent temperature control and long-term protection for engine and transmission components.
