Oil leaks, burning smells, and misfire codes are the telltale signs of a valve cover that has reached its limit. Whether the original plastic unit has warped from heat cycles or the gasket has hardened beyond sealing, replacing this critical component is one of the most impactful maintenance steps you can take for a high-mileage engine.
I’m Amir — the founder and writer behind Four Wheel Ask. I evaluate aftermarket engine components by analyzing material composition, owner-reported longevity data, and real-world fitment feedback across a wide range of vehicle platforms.
After analyzing owner feedback and build quality data, I’ve narrowed the best 2jz cam cover options to a select few that deliver consistent performance.
How To Choose The Best 2JZ Cam Cover
A valve cover — often called a cam cover on engines like the 2JZ — does more than cap the top of the cylinder head. It houses the PCV system, seals the spark plug wells, and must withstand constant thermal cycling. Choosing the wrong one leads to oil leaks, vacuum leaks, and repeat labor. Focus on these three factors before buying.
Material: Plastic vs. Aluminum
Original equipment valve covers on many modern engines are molded plastic. They are lightweight and cost-effective to produce, but heat cycles cause them to warp and crack over time. Aluminum covers eliminate that failure mode entirely. They dissipate heat better, resist deformation, and often include replaceable spark plug tube seals — a feature that extends service life far beyond a plastic unit. The trade-off is slightly higher mass and a price that reflects the material upgrade.
Gasket and PCV Quality
The gasket is the actual sealing interface. Covers that ship with pre-installed gaskets save assembly time, but the rubber compound matters. Silicone-based gaskets resist heat better than basic rubber. Equally important is the PCV valve: a stuck-open or stuck-closed PCV causes crankcase pressure issues that can push oil past even a new gasket. Kits that include a quality PCV valve and fresh spark plug tube seals are worth the premium.
Model-Specific Fitment
Not all valve covers are interchangeable even when they share an engine family. Mounting bosses, coil pack wiring bracket locations, and bolt depths vary by chassis and production year. Always verify the OEM part number cross-reference and read owner feedback for your specific vehicle before purchasing. A cover that fits the engine but not the accessory layout will still leak or require modification.
Quick Comparison
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| Model | Category | Best For | Key Spec | Amazon |
|---|---|---|---|---|
| MILIPARTS Aluminum Cover | Premium Aluminum | VQ35DE Leak Fix | 3.5L V6 Aluminum Kit | Amazon |
| A-Premium Valve Cover | OEM Replacement | BMW N52 Seal | L6 3.0L Complete Set | Amazon |
| MITZONE Red Aluminum | Design Upgrade | VQ35DE Style | 3.5L V6 Red Aluminum | Amazon |
| MITZONE N55 Aluminum | High-Performance | BMW N55 Seal | L6 3.0L Aluminum Kit | Amazon |
| Tykick Valve Cover | Value Kit | Nissan V6 Service | 3.5L V6 Complete Kit | Amazon |
| maXpeedingrods Cover | Budget Replacement | Cost-Effective Fix | 3.5L V6 Set | Amazon |
| MITZOEN Valve Cover | Economy Kit | Basic Replacement | 3.5L V6 Plastic | Amazon |
In‑Depth Reviews
1. MILIPARTS Upgrade Aluminum Valve Cover Set
This silver aluminum valve cover set from MILIPARTS is designed specifically for the VQ35DE engine found in the 2003–2008 Nissan 350Z and Infiniti G35, FX35, and M35. The upgrade from factory plastic to aluminum addresses the most common failure point on these engines: warped covers that cause persistent oil leaks and misfire-inducing oil intrusion into the spark plug wells. The kit ships with gaskets, bolts, an oil filler cap, PCV valve, PCV hose, and spark plug tube seals — everything needed for a full swap.
Owner feedback consistently highlights the fit and finish as comparable to OEM, with the metallic paint providing a visual upgrade under the hood. The replaceable tube seals are a major advantage over the original equipment design, which required cover replacement when seals failed. Some owners note that the included gaskets work well but recommend using OEM gaskets for maximum longevity. A few reports mention that bolt hole depth can be tight, requiring a minor adjustment to avoid stripping.
Multiple long-term reports confirm no leaks after eight months of daily driving, and the aluminum construction eliminates the cracking risk entirely. The kit is a comprehensive package that simplifies installation, and the weight savings over the plastic original is noticeable. For owners of VQ35DE-powered vehicles looking for a permanent fix to valve cover leaks, this set offers the best balance of material quality and included components.
What works
- Aluminum build resists warping and cracking permanently
- Replaceable spark plug tube seals extend service life
- Complete kit with gaskets, bolts, PCV valve, and hose
What doesn’t
- Included gaskets work but OEM versions offer better longevity
- Some bolt holes require depth adjustment before installation
- Not compatible with VQ35HR or VQ37VHR engines
2. A-Premium Engine Valve Cover for BMW N52
A-Premium covers a broad range of BMW applications with this valve cover designed for the N52 naturally aspirated inline-six. Fitment spans the 125i, 128i, 130i, 323i, 328i, 525i, 528i, 530i, X3, X5, Z4, and several other models across the E60, E70, E82, E83, E84, E89, E90, and E92 chassis. The kit arrives pre-assembled with a main gasket, three spark plug seals, twenty bolts, and an oil filler cap, matching OEM part numbers 11127552281, 11127559311, and 11127560482.
Owner reports describe the fit as exact on 2008 328i coupe and 2011 528i applications, with no leaks after proper installation. The plastic construction matches the original design, so it behaves thermally the same way the factory part did. Several users note that the included gasket works fine but substituting a genuine BMW gasket provides extra peace of mind. The PCV valve integration is correct, which is critical for preventing crankcase pressure buildup on the N52.
One common observation is that the plastic is somewhat fragile compared to metal alternatives, though this is inherent to the OEM-style design. A small number of owners reported an oil cap that leaked immediately and recommended reusing the original cap. The kit represents a solid value for those who want a direct replacement without switching to an aluminum aftermarket cover, and the included hardware simplifies what is already a straightforward job on the N52.
What works
- Exact OEM-style fit across many BMW N52 applications
- Comprehensive kit with gasket, seals, bolts, and cap
- Correct PCV valve integration prevents pressure issues
What doesn’t
- Plastic construction remains susceptible to heat cycling
- Included oil cap may not seal properly on some units
- Rear captive screw can be difficult to align during install
3. MITZONE Upgrade Aluminum Valve Cover Red
MITZONE offers a visually distinct alternative for the VQ35DE engine with this red aluminum valve cover set. Compatible with the 2003–2006 Nissan 350Z and 2003–2008 Infiniti FX35, G35, and M35, it replaces OEM part numbers 13264-AM600 and 13264-AM610. The kit includes both left and right covers, bolts, oil cap, gaskets, plug tube seals, PCV valve, and a new PCV hose — a complete swap package that leaves nothing to source separately.
Owner reports confirm the fitment is precise for the DE variant of the VQ35, with no modification required for installation. The red paint finish is applied evenly with no overspray or blemishes, though multiple users note that the paint scratches more easily than expected. Several long-term reviews describe zero leaks after thousands of miles, especially when used with OEM gaskets rather than the included ones. The replaceable spark plug tube seals are a functional upgrade over the original press-in design.
A recurring detail in owner feedback involves the threaded holes for coil pack brackets and wire harness clips — some are not deep enough and require shorter bolts or washers. This is a minor fitment nuance but worth noting before installation. The included gaskets are similar in material to OEM units, but several experienced builders recommend swapping to Fel-Pro or genuine Nissan gaskets for maximum sealing confidence. The kit delivers strong value for those prioritizing aesthetics alongside function.
What works
- Red aluminum finish adds under-hood visual appeal
- Complete kit with all necessary hardware and hoses
- Replaceable tube seals extend overall service life
What doesn’t
- Paint finish is not highly durable against scratches
- Bracket threaded holes may need depth adjustment
- Included gaskets are adequate but aftermarket options improve longevity
4. MITZONE Aluminum N55 Valve Cover Kit
This MITZONE aluminum valve cover is engineered for the BMW N55 turbocharged inline-six, covering a wide range of applications from the 2011–2013 135i and 335i to the 2013–2015 740i and 740Li, plus numerous X3, X5, X6, and M2 variants. It replaces the factory plastic cover with an aluminum unit that eliminates the cracking and warping that plagues the original part on turbocharged engines. The kit includes a pre-installed gasket, bolts, oil cap, PCV valve, and plug tube seals.
Owners report that the fit is accurate and the aluminum construction provides a noticeable quality improvement over the plastic OEM cover. Several long-term reviews document no leaks after a year of use in hot climates, with one early production issue involving a cracked corner on the first unit that was resolved with a replacement. A consistent recommendation across multiple reviews is to apply Loctite to the bolts and retorque after the initial heat cycle, as some bolts have been observed backing out without thread locker.
The kit includes everything needed for a full replacement, and the aluminum build means it will not deform under the high underhood temperatures typical of turbocharged engines. Some owners noted minor abrasions or chips on non-functional edges of the casting, suggesting the packaging could be improved. For N55 owners looking to move past the recurring plastic valve cover failure cycle, this kit represents a durable, cost-effective upgrade that addresses the root cause of the problem.
What works
- Aluminum construction eliminates cracking and warping
- Complete kit with gasket, bolts, cap, and PCV valve
- Comprehensive fitment covers many BMW N55 applications
What doesn’t
- Bolts may back out without thread locker application
- Minor casting abrasions reported on some units
- Installation requires careful torque sequence and retorque
5. Tykick Engine Valve Covers for Nissan V6
Tykick offers a comprehensive valve cover set for Nissan’s 3.5L V6 as used in the Maxima (2009–2020), Murano (2015–2020), Altima (2015–2018), Pathfinder (2015–2016), and the Infiniti QX60 (2015–2018). The kit is manufactured to OE specifications and replaces part numbers 13264-9N00A and 13264-9N00B. It ships as a complete package with both covers, gaskets, spark plug tube seals, and all necessary hardware.
Owner feedback indicates good initial quality, with several users reporting perfect fitment and no issues after installation. The plastic construction matches the original Nissan design, so thermal behavior and expansion rates are consistent with what the engine was designed for. Verified purchasers note that the kit includes everything needed for a straightforward replacement, and the six-month defect coverage provides a reasonable safety net for material or workmanship issues.
The value proposition here is strong for those who want a direct OEM-style replacement without paying dealer pricing. While the plastic material means it will eventually be subject to the same heat-cycling degradation as the original, the price point makes it a practical option for routine maintenance. Some owners have reported no check engine lights or performance issues after installation, confirming that the PCV and sealing systems function correctly out of the box.
What works
- Complete kit with both covers and all hardware included
- Direct OEM-style fitment for multiple Nissan V6 applications
- Good initial sealing performance with no reported leaks
What doesn’t
- Plastic construction will eventually warp like factory units
- No PCV valve included in the kit
- Limited warranty coverage compared to premium options
6. maXpeedingrods Engine Valve Cover Set
maXpeedingrods delivers a budget-oriented valve cover kit compatible with the Nissan V6 3.5L engine family, covering the Altima (2015–2018), Maxima (2009–2020), Pathfinder (2015–2016), Murano (2015–2020), and Infiniti QX60 (2015–2018). The set replaces OEM numbers 13264-9N00A and 13264-9N00B and includes gaskets, spark plug seals, and mounting hardware. It is designed as a direct-fit solution for oil leak and burning smell repairs.
Owner reports are largely positive for the price point, with many users confirming that the fit and finish are excellent and that the seals prevent leaks effectively. The kit resolved burnt oil smell issues on multiple vehicle models, and several owners noted that the included gaskets performed well after installation. A common observation is that the included bolts are the weakest link — some users reported that they stripped when torqued to specification, recommending reuse of the original OEM bolts.
The plastic construction is consistent with the factory design, so the same long-term warping risk applies. The gaskets arrive folded in the package but relax into shape during installation without issue. For those working within a tight budget or needing a quick fix, this kit provides a functional solution at a compelling price. The lifetime technical support and one-year warranty add some peace of mind for the value-conscious buyer.
What works
- Low cost makes it accessible for budget-conscious repairs
- Effective seal against oil leaks and burning smell
- Direct fitment with no modification required
What doesn’t
- Included bolts are low quality and prone to stripping
- Plastic construction limits long-term durability
- Gaskets arrive folded and need time to relax
7. MITZOEN Valve Cover Set for Nissan V6
MITZOEN offers a plastic valve cover set for the Nissan V6 3.5L engine, covering the Altima (2015–2018), Maxima (2009–2024), Murano (2015–2024), Pathfinder (2015–2017), and Infiniti QX60 (2015–2017). The kit replaces part numbers 13264-9N00A and 13264-9N00B and includes bolts, oil cap, gaskets, spark plug tube seals, and a PCV valve. The comprehensive parts list is the strongest aspect of this package.
Despite the complete kit contents, owner feedback reveals several reliability concerns. Multiple verified purchasers reported leaks developing after installation, with one case showing oil pooling around a spark plug after just one month of use. The gaskets were described as rock hard after eighteen months, indicating the rubber compound may not withstand prolonged heat exposure. Two separate owners reported that the plastic around the bolt holes cracked during installation, suggesting the material is brittle.
A specific diagnosis issue involved the spark plug tube gaskets not seating correctly, causing an air leak that triggered a P2A00 error code. This led to unnecessary diagnostic work and parts replacement before the root cause was identified. While the kit includes everything on paper and the price is low, the pattern of premature sealing failure and material quality concerns makes this a high-risk option. Buyers would be better served by investing in an aluminum set or a higher-quality plastic alternative.
What works
- Comprehensive kit includes PCV valve and tube seals
- Direct fitment for multiple Nissan V6 applications
- Low initial investment for a complete replacement
What doesn’t
- Gaskets harden and fail within 18 months
- Plastic is brittle and prone to cracking at bolt points
- Spark plug tube seal fitment can cause air leak codes
Hardware & Specs Guide
Plastic vs. Aluminum Construction
The most important distinction between valve cover options is the material. Plastic covers are lighter and cheaper but expand more under heat, leading to warpage over time. Aluminum covers cost more but maintain dimensional stability, resist cracking, and often feature replaceable spark plug tube seals. For turbocharged engines or high-mileage daily drivers, aluminum is the clear long-term choice.
Gasket Material and Compatibility
Gaskets are typically made from rubber, silicone, or a composite material. Silicone-based gaskets handle higher temperatures without hardening, while basic rubber can become brittle after repeated heat cycles. Many aftermarket kits include gaskets that are adequate for initial use, but experienced owners often recommend upgrading to OEM or Fel-Pro gaskets for extended service life.
PCV Valve Integration
The PCV valve is often integrated into the valve cover on modern engines. A failing PCV can cause crankcase pressure buildup that forces oil past seals. Kits that include a new PCV valve eliminate this variable during replacement. For engines where the PCV is separate, ensure the cover has the correct port orientation to match the factory breather system.
Spark Plug Tube Seals
These small rubber seals sit at the bottom of each spark plug well and prevent oil from contacting the plug and coil boot. On plastic covers, these are often permanently molded in, requiring full cover replacement when they fail. Aluminum covers typically use replaceable seals, which is a significant maintenance advantage that reduces long-term cost.
FAQ
How often should a valve cover be replaced?
Can I replace just the gasket instead of the whole cover?
Are aluminum valve covers worth the extra cost?
Will an aftermarket valve cover fit my specific vehicle model?
Do I need to replace the PCV valve with the valve cover?
Final Thoughts: The Verdict
For most buyers, the best 2jz cam cover winner is the MILIPARTS Upgrade Aluminum Valve Cover Set because it combines a permanent material upgrade with a complete kit that includes every component needed for a full replacement. If you need a precise OEM-style fit for a BMW N52 engine, grab the A-Premium Valve Cover. And for a visually striking aluminum upgrade that adds style to function, nothing beats the MITZONE Red Aluminum Valve Cover Set.
Certification: BSc in Mechanical Engineering
Education: Mechanical engineer
Lives In: 539 W Commerce St, Dallas, TX 75208, USA
Md Amir is an auto mechanic student and writer with over half a decade of experience in the automotive field. He has worked with top automotive brands such as Lexus, Quantum, and also owns two automotive blogs autocarneed.com and taxiwiz.com.