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.
Picking the right spark plug for your Mazda CX-5 matters for everyday drivability, fuel efficiency, and long-term engine health. The right plug reduces misfires, supports consistent combustion, and can extend service intervals while keeping emissions in check. This guide presents the top shortlisted spark plugs for the Mazda CX-5 selected for reliability and fitment. We evaluated each option against durability and heat range to help you choose the best match for your driving style and maintenance plan. Read on to see the top picks and what to consider before you install.
Looking for other parts? See all Mazda CX-5 parts & accessories.
Top Picks at a Glance
| Best Overall The best all-around choice for most situations | Mazda PE5R-18-110 Iridium Spark Plugs (Set of 4) |  |
| Best quality Built to a higher standard if you want something more solid | NGK Iridium IX Spark Plug 6509 — Pack of 8 |  |
| Best Value The sweet spot between price and what you get | NGK LTR5IX-11 Iridium IX Spark Plug — pack of 4 |  |
| Best budget The cheapest option that still gets the job done reliably | APDLFSC Iridium Spark Plugs 4-Pack (Thread Size 12mm) |  |
| Highest Rated A top-rated pick with lots of positive feedback | NGK ILKAR7L11 Laser Iridium Spark Plug — Pack of 4 |  |
| Most popular A crowd favorite that many people choose with confidence | ECCPP UF656 Ignition Coils with Iridium Spark Plugs (4-pack) |  |
| Best Seller A high-volume bestseller chosen again and again | NGK Iridium IX Spark Plug LKAR7BIX-11S (4 Pack) |  |
1. Mazda PE5R-18-110 Iridium Spark Plugs (Set of 4)
| Brand Name | Mazda Motor Corporation |
|---|---|
| Manufacturer Part Number | PE5R-18-110 |
| Core Material | Iridium |
| Compatible with Vehicle Type | UTV |
These are factory-spec iridium spark plugs packaged as a set of four and intended to replace the Mazda PE01/PE02 family of part numbers. They install like a direct replacement and are designed for regular service use in Mazda 2.0L and 2.5L engines found in models such as the CX-5. Iridium core construction offers better ignition stability and longer life than standard copper plugs, which can mean more consistent starts and extended service intervals. Real-world benefits include smoother idle, reliable combustion under varied driving, and potential small gains in fuel economy compared with worn plugs. Practical considerations: they require the correct spark-plug socket size for Mazda plugs and buyers should verify part numbers match the vehicle since fitment differs across engines and trims. A few user reports raise authenticity and quality-control concerns, so inspect plugs on arrival and consider dealer verification if you need guaranteed OEM provenance.
Best for: Balanced buyers who prioritize factory-quality replacements and longer service life for routine maintenance on Mazda CX-5s and similar Mazda models.
Less Ideal for: Shoppers seeking the lowest upfront cost or aftermarket performance-only upgrades should consider budget or specialty alternatives instead.
- Iridium core for longer service life and stable ignition compared with standard plugs
- Sold as a set of four sized for direct replacement in specified Mazda engines
- Manufacturer-branded part designed to match Mazda part numbers and interchange info
- Some buyers reported mixed authenticity or quality-control issues in received sets
- Requires the less-common Mazda spark plug socket size rather than a standard 5/8 socket
Verdict: A factory-specified iridium plug set that delivers longer life and consistent ignition for Mazda CX-5 owners who want a factory-quality replacement.
2. NGK Iridium IX Spark Plug 6509 — Pack of 8
| Thread Size | 14mm |
|---|---|
| Compatible with Vehicle Type | Car, Truck |
| Core Material | Copper |
| Top Material Type | Nickel |
| Unit Count | 8.0 Count |
These NGK Iridium IX 6509 plugs are a performance-focused spark plug sold in an eight-pack and intended as a direct replacement for compatible engines. They use an iridium-tipped center electrode for a hotter, more focused spark and copper core construction with nickel top material, which helps with conductivity and durability under demanding driving. In practice they are installed the same way as factory plugs and commonly require a gap check before installation to ensure optimal ignition and efficiency. Drivers report smoother throttle response and better fuel economy after swapping from standard platinum or worn plugs. The package supplies eight genuine NGK parts, making it convenient for a full-bank replacement. Limitations to note are the need to confirm exact fitment for your Mazda CX-5 engine variant and to gap the plugs to the vehicle specification prior to final torquing; these plugs do not include vehicle-specific installation accessories. For owners chasing durable, high‑quality ignition parts, these deliver a tangible performance uplift when matched to the correct CX-5 engine application.
Best for: Performance-oriented buyers who prioritize ignition quality and durability and want a factory-quality upgrade to extract smoother throttle response and potential fuel-economy gains from their Mazda CX-5.
Less Ideal for: Buyers seeking a no-touch plug swap kit with pre-gapped plugs and installation hardware or those who prefer lower-cost, short-term replacements should consider simpler alternatives.
- Iridium-tipped electrode for a hotter, longer-lasting spark and improved ignition consistency.
- Sold in an eight-pack for full-bank replacements without multiple orders.
- Copper core construction supports good electrical conductivity and stable performance.
- Genuine NGK part compatibility and factory-quality manufacturing.
- Requires checking and possibly re-gapping to Mazda CX-5 specifications before installation.
- Does not include installation accessories such as anti-seize or torque tools.
Verdict: A high-quality iridium replacement sold in an eight-pack that delivers durable, performance-oriented ignition improvements when gapped and fitted to the correct Mazda CX-5 engine.
3. NGK LTR5IX-11 Iridium IX Spark Plug — pack of 4
| Manufacturer | NGK Spark Plug |
|---|---|
| Item model number | 4344 |
| Sold as | Pack of 4 |
| Customer rating | 4.7 out of 5 (620 reviews) |
These NGK Iridium IX plugs are a factory-quality replacement intended to restore reliable ignition and extend service interval compared with standard copper plugs. Sold in a four-pack, they are typically used during scheduled tune-ups or when replacing worn plugs to maintain smooth idle, consistent throttle response, and efficient combustion in a Mazda CX-5. The iridium tip and fine-wire center electrode help deliver a strong, focused spark and improved durability, so you can expect longer life and more stable performance under normal driving. Installation is straightforward for anyone with basic mechanical skills or a shop service, and the plugs are a common, well-documented fit for many Mazda engines. Limitations are that iridium plugs cost more upfront than basic options and some models may still require a gap check before fitting; performance gains over good OEM-equivalent plugs are noticeable mainly in longevity rather than dramatic power increases. These are a practical upgrade when you value longer service life without major tuning changes.
Best for: Practical optimizers who prioritize long-term value and lower maintenance frequency for their Mazda CX-5 without changing engine tuning.
Less Ideal for: Drivers seeking the cheapest short-term replacement or those aiming for noticeable horsepower gains from ignition parts should consider other options.
- Iridium fine-wire center provides a strong, consistent spark and improved longevity over standard plugs.
- Sold in a four-pack, matching typical four-cylinder tune-up needs for Mazda CX-5.
- Produced by a recognized spark plug manufacturer with wide vehicle support and documented fitment.
- Designed to reduce misfires and maintain smoother idle and throttle response as plugs age.
- Higher upfront cost than basic copper plugs despite mainly delivering longer service life rather than power gains.
- Some vehicles may require checking or adjusting the spark plug gap before installation.
Verdict: A durable, factory-quality iridium spark plug pack that extends service intervals and delivers dependable performance for Mazda CX-5 owners focused on practical value.
4. APDLFSC Iridium Spark Plugs 4-Pack (Thread Size 12mm)
| Thread Size | 12mm |
|---|---|
| Core Material | Iridium |
| Top Material Type | Nickel |
| Included Components | 4pcs spark plugs |
| Automotive Fit Type | Vehicle Specific Fit |
These APDLFSC iridium spark plugs are a budget-focused replacement set sold in a pack of four and intended as a direct-fit option for compatible Mazda engines such as those in the CX-5. They use a 0.6 mm iridium center electrode and iridium ground electrode for longer life than standard nickel plugs and are rated for extended replacement intervals, which helps reduce service frequency on everyday driven vehicles. Installation follows standard spark-plug change procedures and they are marketed to correct common ignition symptoms like misfires, rough idle, and poor fuel economy when worn plugs are the cause. Practical benefits include improved longevity over cheap copper plugs and a fitment aimed at factory-spec replacement, so they are convenient for DIY swaps. Limitations are that exact engine compatibility must be confirmed for your CX-5 year and engine code before purchase, and some users report mixed results across different makes, so they may not match OEM behavior in every case.
Best for: Budget-conscious Mazda CX-5 owners who prioritize lower upfront cost and longer service intervals over paying for dealer parts and who prefer doing the install themselves.
Less Ideal for: Drivers seeking guaranteed OEM-equivalent performance across all engine variants or those who prefer dealer-sourced parts and full manufacturer-backed replacements.
- Iridium center electrode for longer service life compared with standard plugs
- Sold as a matched four-pack for full-bank replacement
- Manufactured to meet vehicle-specific factory-quality fitment for compatible engines
- Thin 0.6 mm center electrode can improve ignition consistency and fuel burn
- Engine-by-engine performance can vary so results are not guaranteed across all CX-5 engines
- Some buyers report fitment or drivability issues when used on non-matching engines
Verdict: A cost-conscious iridium replacement set that can extend service intervals for Mazda CX-5s but requires confirming exact engine fitment for best results.
5. NGK ILKAR7L11 Laser Iridium Spark Plug — Pack of 4
| Brand Name | NGK |
|---|---|
| Core Material | Iridium |
| Compatible with Vehicle Type | Car, Truck |
| Unit Count | 4.0 Count |
These NGK Laser Iridium plugs are a direct-fit, vehicle-specific replacement for Mazda CX-5 engines and come pre-gapped for general use. They are built with an iridium center electrode to improve ignitability and extend service life compared with standard copper or nickel plugs. Typical use is a routine tune-up or replacement at the manufacturer-recommended interval to restore throttle response, smooth idle, and fuel efficiency. Practical benefits include long life from the iridium tip, consistent spark performance under everyday driving, and factory-quality manufacturing that matches Mazda’s expected tolerances. Users should check and adjust the gap to the CX-5 specification before installation since some units arrive pre-gapped to a different setting. Also note this is an engine maintenance part so installation requires basic hand tools or a technician. For owners prioritizing reliability and predictable OEM-like operation, these plugs deliver durable, consistent ignition with minimal fuss.
Best for: Reliability-focused buyers who want a factory-quality, long-lasting replacement that restores smooth running and predictable ignition on their Mazda CX-5.
Less Ideal for: Drivers seeking high-performance aftermarket gains or motorsport upgrades should consider specialty performance plugs instead.
- Iridium center electrode for longer life and better ignitability than conventional plugs
- Pack of four covers a full tune-up for 4-cylinder CX-5 engines
- Manufactured to factory-quality tolerances for reliable fit and consistent performance
- Pre-gapped out of the box for quicker installation in many cases
- Some units may arrive with a gap different from Mazda CX-5 specs and require re-gapping before installation
- Requires removal and installation tools or professional service if you are not mechanically inclined
Verdict: A dependable, factory-quality iridium replacement that restores smooth, reliable ignition for the Mazda CX-5 when gapped to spec.
6. ECCPP UF656 Ignition Coils with Iridium Spark Plugs (4-pack)
| Compatible with Vehicle Type | for mazda CX-5 2013-2018 (and other listed Mazda 4-cylinder models) |
|---|---|
| Part Interchange Info | Ignition Coil UF656, PE0118100A, C1837, NGK93501 |
| Automotive Fit Type | Vehicle Specific Fit |
| Installation Type | Bolt-On |
This ECCPP kit bundles four ignition coils with four iridium spark plugs to replace worn units on compatible Mazda four-cylinder engines, including the CX-5. Installation is bolt-on and intended as a direct vehicle-specific replacement for the UF656 family of coils, so the kit is typically used when swapping all coils and plugs at once to clear misfires or restore smooth running. Notable features called out by the manufacturer include epoxy resin insulation and rubber contacts that aim to resist high engine temperatures and provide a firm electrical connection. In practice this package offers a straightforward one-stop refresh: new coils and plugs together reduce diagnosis time and ensure matched components. Reports from users show many successful repairs and easy installation, but there are mixed long-term reliability notes for some applications and occasional fitment tightness around the spark plug wells. If you need a convenient complete set to fix misfires or replace aging ignition parts on a CX-5, this kit covers the basics, though buyers who prioritize long-term durability may prefer higher-end factory-quality replacements.
Best for: Convenience-driven buyers who want a single kit to quickly replace all ignition coils and spark plugs on their Mazda CX-5 and prefer a straightforward DIY solution that minimizes visits to a shop.
Less Ideal for: Drivers who prioritize maximum long-term durability or strict factory-quality parts and those who plan infrequent DIY maintenance should consider higher-end or OEM factory-quality replacements instead.
- Complete kit includes four ignition coils plus four iridium spark plugs so you can replace all cylinders at once.
- Vehicle-specific fitment for Mazda CX-5 and other listed Mazda four-cylinder models simplifies selection and installation.
- Epoxy resin insulation and rubber contacts are intended to improve heat resistance and electrical sealing under typical engine conditions.
- Bolt-on installation means no special modifications are required and basic hand tools are sufficient for most DIY jobs.
- Some users report shorter lifespan or intermittent misfires after a few months in certain vehicles, indicating variable long-term reliability.
- The coil boot can fit tightly through some spark plug wells, which may complicate installation or removal in confined engine bays.
Verdict: A convenient all-in-one coil and plug kit that simplifies DIY repairs on Mazda CX-5 engines, though long-term durability can vary.
7. NGK Iridium IX Spark Plug LKAR7BIX-11S (4 Pack)
| Core Material | Iridium |
|---|---|
| Thread Size | M14 x 1.25 |
| Vehicle Service Type | Car, Truck |
| Position | Front, Rear |
These NGK Iridium IX plugs deliver a finer, more consistent spark than standard plugs, using a 0.6 mm laser-welded iridium tip and tapered ground electrode to reduce quenching and support reliable combustion. They are designed for vehicle-specific fit and are typically used as a direct replacement to restore smooth idle, reduce misfires, and improve throttle response on compatible engines. Notable features include a long insulator nose and corrugated ribs to prevent fouling and flashover, plus trivalent metal plating to resist corrosion and seizing. In practice this means easier starting, steadier idling, and potentially improved fuel economy compared with worn plugs. Limitations to expect are that some installers report a tighter pre-gap that can make manual re-gapping awkward and the slim tip may require a proper spark-plug socket for installation; a small number of users have reported premature wear in high-mileage or stressed engines. For a risk-averse buyer seeking a dependable factory-quality replacement, these plugs offer familiar performance with widely reported real-world reliability when installed correctly.
Best for: Buyers who prioritize low risk and factory-quality replacements and want a proven, maintenance-focused upgrade that restores smooth running and reduces misfires on their Mazda CX-5.
Less Ideal for: Drivers looking for maximal race or high-performance gains beyond stock tuning or those who prefer bargain, short-life aftermarket plugs should consider purpose-built performance options instead.
- Laser-welded 0.6 mm iridium tip for consistent spark and extended electrode life
- Tapered ground electrode and long insulator nose reduce quenching and fouling for smoother idle
- Trivalent plating on threads minimizes corrosion and eliminates need for anti-seize
- Vehicle-specific fit designed to match factory replacement dimensions and performance
- Pre-set gap can be tighter than OEM recommendation, making manual re-gapping harder
- Slim tip geometry may require a specific spark-plug socket for installation
- A small number of users report early failure in high-stress or very high-mileage engines
Verdict: A dependable, factory-style iridium replacement that restores smooth operation on the Mazda CX-5 while demanding correct tools and attention to gap settings.
Choosing the Right Mazda CX-5 Spark Plug: Key Factors to Consider
Electrode Material and Longevity
Electrode construction is one of the biggest determinants of lifespan and consistent performance. Iridium and platinum alloys typically offer longer service life than standard copper electrodes because they resist wear and maintain a stable spark gap over many miles. A longer-lasting electrode reduces the frequency of spark plug replacement and helps sustain fuel efficiency and smooth idle.
Durability also influences maintenance planning. If you drive frequently or in stop-and-go conditions, a more durable electrode can prevent premature misfires and give you longer intervals between inspections. Consider how many miles you expect to keep the plugs before deciding on a higher-end material.
Correct Heat Range
Heat range affects how well a plug dissipates combustion heat and resists fouling or pre-ignition. A plug that is too cold can foul and cause misfires, while one that is too hot may accelerate electrode wear or cause detonation in extreme cases. Choosing the appropriate heat range for the Mazda CX-5 engine and your typical driving conditions helps ensure consistent ignition and engine safety.
Think about climate and driving style when assessing heat range. Frequent short trips, city driving, or cold climates may favor a slightly hotter plug to avoid fouling, whereas sustained high-load driving may call for a cooler plug to manage combustion temperatures.
Proper Spark Plug Gap
The gap between the center and ground electrode determines the spark characteristics and affects ignition reliability. A gap that is too wide can lead to misfires, especially under high boost or high-load conditions, while a gap that is too narrow may reduce combustion efficiency. Maintaining the manufacturer-recommended gap for the Mazda CX-5 ensures the ignition system operates within its designed parameters.
Some replacement plugs come pre-gapped, but shipping and handling can alter that setting. Always verify the gap before installation and adjust carefully using the appropriate tool so you do not damage the electrodes.
Compatibility and Fitment
Correct thread size, seat type, and reach are essential to avoid engine damage and ensure safe installation. A plug that does not seat correctly can lead to compression leaks, poor heat transfer, or thread damage. Confirming fitment to the Mazda CX-5 engine specification reduces the risk of service issues and prevents costly repairs.
Check thread length, hex size for socket fit, and whether the plug requires a specific torque or installation procedure. These details matter for both DIY installers and technicians to achieve a reliable seal and consistent performance.
Resistance to Fouling and Contaminants
Exposure to oil, fuel additives, or rich running conditions can cause deposits to form on plugs and impair ignition. Look for plugs with designs or coatings that resist deposit buildup and maintain a stable spark over time. This is particularly important if you frequently encounter short trips or variable fueling conditions that encourage fouling.
A plug that resists contamination helps avoid symptoms like rough idle, increased emissions, and reduced fuel economy. Consider maintenance habits and the engine's tendency to run rich when assessing fouling resistance.
Installation and Maintenance Considerations
Ease of installation affects the risk of cross-threading, improper torque, or damaging the plug. Features such as a well-defined hex area, corrosion-resistant plating on threads, and clear gap specifications make installation smoother. Also consider recommended torque values and whether a torque wrench is needed to achieve the correct seal without over-tightening.
Maintenance factors include service interval recommendations and whether the plug requires special tools or procedures to replace. Choose a plug whose installation and maintenance fit your comfort level or the capabilities of your service provider.
How We Chose the Best Mazda CX-5 Spark Plug
We focused on attributes that directly affect the Mazda CX-5 engine performance and ownership experience. Key evaluation criteria included electrode material and longevity, heat range suitability for driven conditions, verified fitment to Mazda CX-5 engines, and resistance to fouling and misfire under normal driving. We also considered build quality aspects such as thread and seat integrity, and ease of installation including recommended spark plug gap and torque sensitivity.Products were excluded if they lacked clear fitment information for the Mazda CX-5, had insufficient technical specifications, or showed inconsistent durability reports. The goal was to surface choices that balance long service life with correct heat range and reliable ignition characteristics rather than emphasizing marketing claims or marginal performance gains.
Our full evaluation process is outlined in our review methodology.
FAQ
How often should I replace spark plugs in a Mazda CX-5?
Replacement intervals depend on the plug material and driving conditions. Iridium or platinum plugs often last longer and may be good for many tens of thousands of miles, while standard copper plugs usually need earlier service. Check the vehicle maintenance schedule and monitor for symptoms like rough idle or misfires to determine if earlier replacement is needed.
What are common spark plug symptoms to watch for in the Mazda CX-5?
Typical signs include rough idling, hesitation under acceleration, a drop in fuel economy, and occasional engine misfires. You may also notice difficulty starting in cold conditions or inconsistent throttle response. These symptoms often suggest worn electrodes, fouling, or incorrect gap settings rather than a single specific cause.
Can I change Mazda CX-5 spark plugs myself?
Many owners can perform spark plug replacement with basic tools and some mechanical experience. You will need the correct socket, a gap tool, and a torque wrench to seat plugs properly. Be mindful of thread engagement and follow the recommended torque and gap specifications to avoid damage.
Does spark plug heat range affect cold starts?
Yes, heat range influences how quickly a plug reaches an operating temperature and resists fouling during cold starts. A slightly hotter plug can help prevent fouling on short, cold runs, while a cooler plug may be preferable for sustained high-load driving. Choose a heat range that matches your climate and typical driving pattern.
Should I change the spark plug gap when replacing plugs?
You should verify the gap even if replacement plugs are advertised as pre-gapped because shipping can alter the setting. Adjust the gap to the specification for the Mazda CX-5 engine if needed, using a proper gap tool and handling the electrodes gently to avoid damage.
What causes engine misfire spark plug issues?
Misfires linked to plugs can result from worn electrodes, fouling from oil or fuel, incorrect gap, or improper heat range. Electrical issues elsewhere in the ignition system can also produce similar symptoms, so it is important to diagnose comprehensively rather than assuming plugs are the sole cause.
Conclusion
Selecting the right spark plugs for a Mazda CX-5 means balancing electrode material, correct heat range, and proper fitment. Prioritize plugs that match the engine's heat-dissipation needs and offer durable electrodes if you prefer longer service intervals.Be mindful of gap settings and installation practices to avoid misfires or damage. Consider driving conditions, maintenance habits, and ease of service when deciding which option best meets your needs.
Explore More:
- Check out all Mazda CX-5 parts & accessories
- Explore Spark Plugs Maintenance & Repair Guides
- Explore Engine
- Browse all Auto Parts
