Note: This article contains affiliate links. If you click on these links and make a purchase, I may earn a small commission at no extra cost to you. This helps support my research and content. Read my full affiliate disclosure here.
If you drive an Infiniti G35 hard, tow occasionally, or want to preserve engine longevity, choosing the right oil cooler matters. The proper oil cooler helps control oil temperatures, reduces thermal stress on engine parts, and can extend service intervals by keeping oil within safe operating range.This guide covers our top shortlisted options for the Infiniti G35 and explains the criteria we used to evaluate cooling capacity, fitment, and installation effort. Read on to compare strengths and find an option that matches your driving style and maintenance preferences.
Looking for other parts? See all Infiniti G35 parts & accessories.
Top Picks at a Glance
| Best overall The best all-around choice for most situations | EVIL ENERGY 19-Row Universal Stacked-Plate Oil Cooler Kit |  |
| Best Quality Built to a higher standard if you want something more solid | Mishimoto MMOC-350Z-03 Oil Cooler Kit for Nissan 350Z (2003–2007) / Infiniti G35 (2003–2009) Coupe |  |
| Best Value The sweet spot between price and what you get | A-Premium 8-Pass Aluminum Transmission Oil Cooler Kit |  |
| Best budget The cheapest option that still gets the job done reliably | MAGQOO 8-Row Tube-and-Fin Universal Transmission/Oil Cooler Kit |  |
| Highest Rated A top-rated pick with lots of positive feedback | BARTOO 1/2" Transmission Oil Cooler Kit, 16-Pass Tube-and-Fin Aluminum |  |
| Most popular A crowd favorite that many people choose with confidence | Readair Radiator with Transmission Oil Cooler for Infiniti G35 3.5L (2003–2007) |  |
| Best Seller A high-volume bestseller chosen again and again | EVIL ENERGY 5/16" 6-Pass Tube-and-Fin Transmission Oil Cooler Kit |  |
1. EVIL ENERGY 19-Row Universal Stacked-Plate Oil Cooler Kit
| Core type | 19-row stacked-plate |
|---|---|
| Cooler material | Aluminum alloy |
| Oil capacity (cooler) | 0.45 L |
| Hose working pressure | 500 PSI |
| Working temperature (hose) | -40°F to 257°F |
This EVIL ENERGY 19-row oil cooler kit uses a stacked-plate aluminum cooler with braided nylon hoses and AN-style fittings to reduce oil temperatures and improve lubrication under load. Typical installation pairs the sandwich adapter and hoses to route oil to the cooler mounted where airflow is available, helping oil and transmission temps run several degrees cooler during spirited driving or towing. The kit includes two hose lengths, pressure ratings (working 500 PSI, test 116 PSI, burst 232 PSI) and basic instructions, so it covers the plumbing and cooling hardware most installers need. Practical benefits are clear cooling capacity from the 19-row core and relatively high hose working temperature, plus universal fit intent for custom installs. Limitations are that mounting hardware is minimal and some buyers report fitment or adapter thread mismatches that require additional fittings or fabrication, and AN fittings can be fiddly to assemble without the right tools. Expect some trial and mock-up time when adapting it to an Infiniti G35’s engine bay and oil adapter location.
Best for: A balanced all-round buyer who wants stronger oil cooling for spirited street driving or occasional track use on an Infiniti G35 and is willing to do a moderate DIY install or have a shop adapt the kit.
Less Ideal for: Not a good choice for buyers seeking a direct bolt-on, no-modification solution or for owners who want a plug-and-play factory-quality replacement without custom fittings or fabrication.
- High cooling capacity from a 19-row stacked-plate core for sustained oil temperature control
- Includes braided hoses with a high working pressure and wide temperature range for reliable plumbing
- Aluminum construction is lightweight and corrosion-resistant compared with steel alternatives
- Universal design allows custom placement to find the best airflow in the G35 engine bay
- Limited mounting hardware included so additional brackets or fasteners are often required
- Sandwich adapter and included fittings may not match every vehicle thread type and can require sourcing alternate adapters
- Some small fasteners and fittings are lower quality and can be prone to stripping during installation
Verdict: Strong cooling performance for the price if you are prepared to adapt fittings and make a custom mount in the G35.
2. Mishimoto MMOC-350Z-03 Oil Cooler Kit for Nissan 350Z (2003–2007) / Infiniti G35 (2003–2009) Coupe
| Compatible vehicles | Nissan 350Z 2003-2007 / Infiniti G35 2003-2009 coupe |
|---|---|
| Core | 19-row stacked-plate |
| Oil capacity increase | 0.65 quarts |
| Mounting type | Panel Mount |
The Mishimoto MMOC-350Z-03 is a full oil cooler kit engineered for the 2003–2007 Nissan 350Z and 2003–2009 Infiniti G35 coupe to reduce engine oil temperature and increase oil capacity. It installs as a front-mounted, panel-style cooler with a 19-row stacked-plate core that Mishimoto says drops oil temps by about 25 degrees Fahrenheit while adding roughly 0.65 quarts of capacity. The kit includes a billet aluminum sandwich plate available in standard or thermostatic versions and is intended to work with both manual and automatic transmissions. In practice this kit is aimed at performance drivers who push their VQ35 engines hard or run hot climates; users report clear cooling gains and a durable, nicely finished cooler that looks good behind the bumper. Expect some installation effort: the kit has mixed feedback on hardware completeness and fitment alignment, and a few customers needed minor trimming or drilling and careful tightening of banjo fittings to stop leaks. For a performance-oriented buyer the Mishimoto offers a proven cooling solution and factory-quality construction, but budget-minded or strictly stock-focused owners should plan for a careful install and verify included fasteners before starting work.
Best for: Performance-oriented owners who prioritize engine oil temperature control and reliability under sustained spirited driving, track days, or hot-climate street use.
Less Ideal for: Owners seeking an exact bolt-on, no-modification factory-replacement who do not want to verify hardware or perform minor bumper trimming during installation.
- Vehicle-specific design for 350Z and G35 coupe for targeted fit and performance
- 19-row stacked-plate core provides substantial oil temperature reduction
- Billet aluminum sandwich plate offered in thermostatic or standard options
- Increases oil capacity by approximately 0.65 quarts for added thermal buffer
- Backed by Mishimoto lifetime warranty
- Some buyers reported missing or substandard hardware and occasional hose or fitting leaks
- Installation can require cutting, drilling, or trimming on certain bumpers despite being marketed as direct fit
Verdict: A performance-grade, vehicle-specific oil cooler kit that meaningfully lowers oil temperatures for spirited driving on 350Z and G35 coupes.
3. A-Premium 8-Pass Aluminum Transmission Oil Cooler Kit
| Material | Aluminum |
|---|---|
| Core type | 8 pass tube-and-fin |
| Hose type | Silicone tubes |
| Reference numbers | 1405, 405, 53003 |
This A-Premium kit installs inline to provide additional transmission cooling using an 8-pass tube-and-fin aluminum core and included hoses and basic mounting hardware. It is typically used as a supplemental cooler when the factory cooler is insufficient for towing, spirited driving, or engines that run hot. Notable features include an 8-row core for increased heat exchange and silicone hose sections that resist oil degradation. In practical use buyers report measurable temperature drops when mounted ahead of or downstream of the OEM cooler, and the kit offers multiple mounting points for flexible placement. Limitations are that the kit is universal rather than vehicle-specific so you may need to source adapter fittings or non-screw clamps for a clean, leak-free connection on an Infiniti G35. Brackets are minimal and may require custom mounting or additional fasteners for a factory-like installation. For a G35 owner wanting sensible cooling improvements without an expensive OEM-style replacement, this kit delivers strong cooling performance for the price but expects a little fabrication and extra fittings for a polished install.
Best for: A practical optimizer who wants reliable, budget-friendly cooling gains for an Infiniti G35 and is willing to do modest fabrication or buy small adapters to fit the kit neatly.
Less Ideal for: Owners who want a direct-fit, factory-quality replacement with plug-and-play fittings and complete vehicle-specific mounting hardware should look for a vehicle-specific cooler kit.
- 8-pass aluminum tube-and-fin core provides substantial extra cooling capacity
- Includes silicone hose sections that resist oil breakdown and simplify routing
- Multiple mounting holes and zip-tie accessories allow flexible placement near the condenser or radiator
- Universal kit works for a variety of installations and can reduce transmission fluid temperatures significantly
- Not vehicle-specific so adapter fittings or different clamps are often required for a clean connection
- Minimal mounting hardware may require fabricating brackets or buying additional fasteners
Verdict: A cost-effective way to drop transmission temperatures on an Infiniti G35 if you are comfortable adding a few fittings and doing light fabrication for a tidy install.
4. MAGQOO 8-Row Tube-and-Fin Universal Transmission/Oil Cooler Kit
| Brand | MAGQOO |
|---|---|
| Model | Universal |
| Manufacturer Part Number | YM3288 |
The MAGQOO 8-row tube-and-fin cooler is a budget-friendly aftermarket unit that lowers transmission and other fluid temperatures using an 8-pass flow path and a compact aluminum core. It ships as a universal kit with basic rubber hose and a mounting kit, so installation typically involves relocating lines, mounting the cooler in front of the radiator or A/C condenser, and plumbing the hoses with clamps or fittings. The eight-pass design and thin profile make it effective at dropping temperatures under light towing or spirited driving while fitting into tight spaces on the Infiniti G35. Practical benefits include simpler mounting options and compatibility with multiple fluid types, which makes it useful for owners wanting an inexpensive way to protect the transmission. Limitations are the generic hardware provided and the universal fittings, so expect to buy better clamps or fittings and plan for a custom adapter or reroute to get a clean, leak-free installation on the G35.
Best for: Budget-conscious Infiniti G35 owners who prioritize lowering transmission temperatures affordably and are comfortable doing or modifying a DIY installation.
Less Ideal for: Drivers seeking a plug-and-play, vehicle-specific cooler with stainless fittings and OEM-style hoses should consider professionally matched kits instead.
- 8-pass tube-and-fin core provides measurable fluid temperature reduction
- Compact, low-profile 15.5" length fits into tight front-end locations
- Works with transmission, power steering, and engine oil for versatility
- Affordably priced for budget-conscious upgrades
- Includes basic rubber hose and mounting hardware that may not be durable long-term
- Universal fittings may require additional adapters or custom plumbing for a neat G35 install
Verdict: A cost-effective universal cooler that delivers real cooling for the G35 but needs upgraded fittings and some DIY work for a tidy, reliable installation.
5. BARTOO 1/2" Transmission Oil Cooler Kit, 16-Pass Tube-and-Fin Aluminum
| Core type | 16 pass tube-and-fin |
|---|---|
| Material | T-6061 aluminum alloy |
| Intended line size | 1/2" ID cooler lines |
| Working pressure | 145 psi |
| Burst pressure | 900 psi |
This BARTOO transmission oil cooler is a compact, 16-pass tube-and-fin unit made from T-6061 aluminum alloy designed to lower automatic transmission fluid temperatures by increasing air flow across multiple thin tubes and fins. Typical installation involves mounting the cooler where it gets steady airflow, connecting into 1/2" ID transmission cooler lines, and securing with the included hardware. The cooler is straightforward to fit behind the grille or in front of the radiator on an Infiniti G35 with enough space, and users report large temperature drops when airflow is adequate. Its 145 psi working pressure and 900 psi burst rating mean it handles normal service conditions, and the finned design boosts heat rejection compared with simple single-pass cores. Expect basic hardware and universal fittings only, so you may need adapters, proper flaring, or custom brackets for a clean, leak-free OEM-quality install. A few reviewers noted thin construction in places and the need for careful tightening to avoid cracking fittings, so take care during installation and use thread-friendly fittings and torque control.
Best for: A reliability-focused buyer who wants to lower transmission temperatures on an Infiniti G35 with a practical, aftermarket cooling upgrade and is willing to fit and adapt a universal unit for a durable result.
Less Ideal for: Drivers seeking a direct factory-replacement cooler with vehicle-specific fittings or a guaranteed bolt-in solution should consider model-specific alternatives instead.
- 16-pass tube-and-fin core improves heat rejection compared with simple single-pass coolers
- T-6061 aluminum construction with rated working and burst pressures suitable for transmission service
- Compact footprint fits behind grille or in front of the radiator where space is limited
- Includes basic mounting hardware for straightforward installation in many setups
- Universal fittings mean you may need adapters or custom hoses to match factory G35 lines
- Some build elements are thin and can chip or crack if fittings are overtightened
Verdict: A compact, cost-effective aluminum 16-pass cooler that reliably lowers transmission fluid temperatures on an Infiniti G35 if you are prepared to fit adapters and tighten fittings carefully.
6. Readair Radiator with Transmission Oil Cooler for Infiniti G35 3.5L (2003–2007)
| Vehicle fit | Infiniti G35 3.5L 2003–2007 |
|---|---|
| Core material | Aluminum core |
| Transmission cooler | Brass integrated cooler |
| Manufacturing feature | TIG-welded end tanks |
This Readair radiator is built as a direct-fit replacement for the Infiniti G35 3.5L (2003–2007) and includes a brass transmission oil cooler for vehicles with automatic transmissions. It is intended for routine radiator replacement or repair after a failure and installs in the factory location using existing mounting points and hoses. The aluminum core with multi-louvered fins and TIG-welded end tanks aim to improve cooling efficiency and resist leaks, while manufacturer leak testing and treated coatings are meant to extend service life. Buyers will appreciate the complete assembly ready for installation and the inclusion of a transmission cooler, which removes the need to buy separate components. Expect typical aftermarket variability in long-term durability versus higher-end factory-quality radiators; a minority of users report early tank issues, so careful inspection at installation is wise. For most owners this unit offers a convenient, lower-cost way to restore cooling and transmission oil cooling without major modifications.
Best for: Convenience-driven buyers who want a ready-to-install replacement that restores engine and transmission cooling without sourcing multiple parts or custom work.
Less Ideal for: Owners prioritizing the longest possible service life or who prefer OEM-brand parts should consider higher-end factory-quality radiators or dealer replacements.
- Direct-fit design for Infiniti G35 3.5L 2003–2007 for straightforward replacement
- Aluminum core with multi-louvered fins for improved heat dissipation
- Integrated brass transmission oil cooler included for automatic transmissions
- TIG-welded connections and treated coating intended to reduce leaks and corrosion
- Some buyers reported occasional early tank cracking or leaks indicating inconsistent quality control
- Aftermarket construction may not match longevity of premium factory-quality radiators
Verdict: A convenient, direct-fit aftermarket radiator with an integrated transmission cooler that balances ease of installation and value but may vary in long-term durability.
7. EVIL ENERGY 5/16" 6-Pass Tube-and-Fin Transmission Oil Cooler Kit
| Inner hose size | 5/16" ID |
|---|---|
| Core type | 6-pass tube and fin |
| Core material | Aluminum |
| Hose material | CPE |
| Hose working pressure | 145 PSI |
This EVIL ENERGY kit adds an inline aluminum tube-and-fin transmission cooler to help lower transmission fluid temperatures when installed ahead of the radiator or in a high-airflow location. It is typically used as an auxiliary cooler for vehicles that run hot in traffic or under towing load; the kit includes CPE hose rated for high pressure and mounting clips and adapters for 5/16" lines. The 6-pass tube-and-fin design exposes fluid to a series of thin tubes and fins so airflow removes heat efficiently, and the aluminum construction is corrosion resistant and lightweight. Installation is straightforward for a competent DIYer but because it is a universal kit you may need to adapt or flare factory lines for a proper seal. Reviewers note the included adapters and clamps are basic and some fabricating or better clamps improve reliability. For an Infiniti G35 the cooler can reduce transmission temperatures and improve shift feel in stop-and-go driving, but expect to plan mounting location and possibly upgrade fittings for a leak-free installation.
Best for: Risk-averse mainstream buyers who want a straightforward, affordable way to reduce transmission temperatures and protect the drivetrain without extensive modification.
Less Ideal for: Drivers seeking a vehicle-specific plug-and-play solution or those unwilling to do minor line flaring or fabricate mounts should consider a dedicated G35-specific cooler kit or professional installation.
- 6-pass tube-and-fin core improves heat transfer compared with simple single-pass cores
- Aluminum construction resists corrosion and is lightweight
- Complete kit includes hoses, adapters, and basic mounting hardware for faster installation
- CPE hose rated for high working and bursting pressure for transmission applications
- Universal fittings and the included adapter can require modification or flaring to seal on some factory lines
- Stock clamps and adapters are basic and many users replace them with higher-quality clamps or fittings
Verdict: A budget-friendly, effective auxiliary transmission cooler that lowers fluid temps for better drivetrain longevity but may need minor fitting upgrades for a secure, leak-free install on an Infiniti G35.
Choosing the Right Infiniti G35 Oil Cooler: Key Factors to Consider
Cooling Capacity
Cooling capacity determines how effectively the oil cooler reduces oil temperature during sustained high load, stop-and-go driving, or towing. A unit with higher heat rejection capability will help maintain oil viscosity and protect bearings and seals when the engine runs hot.
Assess cooling capacity in the context of your typical use. Occasional spirited driving needs less margin than frequent track work or heavy towing. Also remember that increased cooling capacity can introduce higher pressure drop, so compatibility with the vehicle's oil flow characteristics must be considered.
Fitment And Mounting
Proper fitment ensures the cooler clears nearby components, aligns with mounting points, and avoids interference with wiring, hoses, and steering linkages. A unit designed for the Infiniti G35 minimizes modification and simplifies installation.
Check the cooler's physical dimensions and mounting scheme. Consider whether mounting brackets are included and whether the location exposes the cooler to debris or stone chips. Secure mounting reduces vibration-related fatigue and helps prevent strain on oil lines and fittings.
Material And Core Construction
Core construction and materials affect durability and heat transfer. Brazed aluminum cores typically offer good thermal conductivity and leak resistance, while fin density and tube design influence how efficiently heat moves from oil to air.
Look for corrosion-resistant finishes and robust end tanks. The presence of a replaceable core option can extend service life. Material choices also affect weight and susceptibility to damage from road impacts, so prioritize sturdy construction for daily-driven vehicles.
Oil Flow And Pressure Drop
An oil cooler must maintain adequate flow while offering cooling. Excessive restriction can starve oil passages and raise oil pressure, while too little restriction might reduce cooling efficiency. The balance between flow and pressure drop is crucial for safe engine operation.
Review technical specs for rated flow and pressure drop where available. For models that use external sandwich adapters or remote mounts, ensure the added plumbing does not introduce unacceptable restriction. If the cooler will be used alongside a transmission oil cooler, account for cumulative effects on system flow.
Compatibility With Oil Lines And Adapters
Compatibility with the stock oil lines, available adapters, and common fittings affects installation complexity. Some coolers accept standard threaded fittings, while others require special hoses or adapter plates to mate with the engine's oil passages.
Confirm whether the product includes the necessary fittings or if additional adapters are required. Consider hose routing to avoid sharp bends and rubbing against chassis components. Using proper-rated oil lines and quality clamps reduces leak risk and improves long-term reliability.
Serviceability And Replacement Parts
Serviceability covers how easy it is to repair or replace components such as the core, end tanks, or lines. Access to replacement cores and mounting hardware can make a difference if the cooler is damaged or requires cleaning.
Evaluate whether the design allows for easy disassembly and whether manufacturers or aftermarket vendors supply replacement parts. Units that are difficult to service may end up being replaced entirely after damage, increasing long-term ownership costs.
How We Chose the Best Infiniti G35 Oil Cooler
We focused on items that are directly compatible with the Infiniti G35 and evaluated candidates against several category-specific criteria. Primary filters included proven cooling capacity under sustained load and the unit's physical fitment to the G35 engine bay. We prioritized construction quality, including brazed or welded cores and durable end tanks, because those influence longevity and leak resistance. Ease of installation was another key factor, assessing whether the design works with stock oil lines or commonly used adapters and whether basic hand tools are sufficient. We also considered the clarity of installation instructions and availability of replacement parts such as cores, lines, or mounting brackets. Exclusions: we omitted universal units that require extensive custom fabrication, components intended solely for racing use with impractical plumbing changes, and any products lacking clear fitment information for the G35. The resulting list favors solutions that balance reliable cooling performance, straightforward installation, and long-term serviceability.
Our full evaluation process is outlined in our review methodology.
FAQ
How do I know if my Infiniti G35 needs an oil cooler?
If you regularly run the engine hard, tow, or notice higher-than-normal oil temperatures, an additional oil cooler can help control heat. Other signs include oil that smells burned after prolonged drives or engine performance changes under sustained load. However, diagnosing the need usually depends on observed operating temperatures and driving habits rather than age alone.
Can I install an oil cooler myself on an Infiniti G35?
Many oil coolers are designed for straightforward installation using basic hand tools, but complexity varies. Installation may involve routing hoses, fitting adapters, and securing a mount in the engine bay. If you are comfortable working on fluids and can follow clear instructions, DIY is possible. Otherwise, seek a technician to avoid leaks or incorrect plumbing.
Will adding an oil cooler cause an oil leak?
Any additional fittings and hoses introduce potential leak points, but proper installation and quality components typically prevent leaks. Use correct fittings, torque specifications, and rated hoses. Periodic inspection after installation helps catch issues early. Choosing products with robust connections and clear instructions further reduces risk.
Does installing an oil cooler affect oil change intervals?
An oil cooler helps maintain lower operating temperatures, which can preserve oil properties over time. However, oil change intervals depend on oil type, driving conditions, and manufacturer guidance. Installing a cooler is not a substitute for following recommended maintenance schedules, though it can reduce thermal degradation in demanding conditions.
Are there special hoses or adapters required for the Infiniti G35?
Some installations use the vehicle's stock oil passages with a sandwich adapter, while others require custom hose ends or threaded fittings. Check the chosen cooler's compatibility with Infiniti G35 connection types and whether adapters are included. Using rated, oil-resistant hoses and secure fittings ensures reliable operation.
Can I use the same oil cooler for engine and transmission oil on the G35?
Engine oil coolers and transmission oil coolers have different design considerations and are typically intended for their respective fluids. While some setups allow separate coolers to be mounted in the same area, mixing fluids through a single cooler is not recommended. Choose components designed for the specific oil system to avoid compatibility and performance issues.
Conclusion
When choosing an oil cooler for an Infiniti G35, prioritize proven cooling capacity, correct fitment, and durable construction. Think about how you drive—occasional spirited runs need different margins than frequent towing or track use—and select a unit that matches your typical thermal loads.Balance cooling effectiveness against flow restriction and installation complexity, and verify compatibility with oil lines and adapters. Planning for serviceability and using quality fittings will help ensure reliable operation and protect the engine over time.
Explore More:
- Check out all Infiniti G35 parts & accessories
- Explore Oil Coolers Maintenance & Repair Guides
- Explore Cooling System
- Browse all Auto Parts
