twin tip technology
Denso 4713 Iridium TT Spark Plug
9.7
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Upgrading your spark plugs can dramatically improve engine performance, fuel efficiency, and longevity. We've tested and ranked the best spark plug sets on Amazon US to help you find the perfect match for your vehicle.
| # | Product | Best for | Best For | Type | Electrode Material | |
|---|---|---|---|---|---|---|
| 1 | Denso 4713 Iridium TT Spark Plug | twin tip technology | Iridium | Twin-tip design | Premium | Check Price |
| 2 | Bosch 4417 Platinum+4 Spark Plug | platinum value | Platinum | Four ground electrodes | Mid-range | Check Price |
| 3 | Motorcraft SP-515 Spark Plug | ford oem replacement | Platinum | Platinum tip | Mid-range | Check Price |
Why we picked it: Denso's Iridium TT (Twin Tip) features both an iridium center electrode and a platinum ground electrode for exceptional durability and spark efficiency. The twin-tip design reduces quenching and improves flame propagation. It offers a perfect balance of performance and longevity, often lasting up to 120,000 miles. Ideal for modern high-performance engines.
Owners of late-model vehicles wanting OEM-level performance and longevity.
Those with simple engines that don't require premium plugs.
Key specs: Iridium center - Platinum ground - Twin-tip - 120k mile life - OEM quality
Why we picked it: Bosch's Platinum+4 uses four ground electrodes to ensure a reliable spark even under harsh conditions. The platinum center electrode resists wear, extending service life up to 60,000 miles. The surface air gap design self-cleans to prevent fouling. It's a great upgrade from standard copper plugs at a reasonable price.
Drivers wanting a reliable, long-lasting platinum plug without breaking the bank.
High-performance applications requiring iridium.
Key specs: Platinum - 4 ground electrodes - 60k mile life - Surface air gap - Yttrium enhanced
Why we picked it: Motorcraft is the official Ford OEM parts brand, and the SP-515 double platinum plug is engineered for Ford engines. It provides reliable ignition and long service life (up to 100,000 miles). The double platinum design resists wear on both electrodes. For Ford owners, this is the safest and most reliable choice.
Ford vehicle owners wanting factory-recommended plugs.
Non-Ford owners or those seeking high-performance upgrades.
Key specs: Double platinum - OEM Ford - 100k mile life - Anti-corrosion - Fine-wire design
Replacement intervals vary: copper plugs every 20,000-30,000 miles, platinum every 60,000 miles, and iridium up to 100,000 miles. Always check your vehicle owner's manual for specific recommendations.
Iridium plugs have a finer electrode tip, requiring less voltage and providing better performance and longevity. Platinum plugs are more affordable but have slightly shorter life and less sharp spark. Iridium is best for modern engines; platinum is a good mid-range option.
Yes, as long as the plug matches your engine's specifications (heat range, thread size, reach, and resistance). Brands like NGK, Denso, and Bosch offer OEM-quality or better alternatives. Ensure correct fitment before installation.
Premium plugs like iridium can improve fuel economy by providing a more consistent and efficient spark, especially in modern engines. However, the gain is typically modest (1-3%). The main benefits are longer life and better performance.
Modern engines with high compression or turbocharging benefit from iridium plugs. Older engines with lower compression run fine on copper or platinum. Always check your owner's manual for the recommended plug type.
Spark plugs come in different heat ranges. A colder plug is better for high-performance or racing engines to prevent pre-ignition. A hotter plug is suitable for normal driving to reduce fouling. Use the OEM heat range unless you have modified your engine.
Copper plugs are cheapest but need frequent replacement. Platinum and iridium cost more but last much longer. For most drivers, iridium offers the best balance of performance and longevity. Consider your budget and how long you plan to keep the vehicle.
| Feature | Why it matters |
|---|---|
| Electrode material | Determines spark efficiency, longevity, and cost. Iridium offers the best performance and longest life, followed by platinum, then copper. |
| Heat range | Affects the plug's ability to dissipate heat. Using the wrong heat range can cause engine damage or poor performance. Always use the recommended range. |
| Number of ground electrodes | Multiple ground electrodes (e.g., Bosch Platinum+4) can provide a more reliable spark but may reduce performance in some engines. Standard single ground is most common. |
| Resistance type | Resistor plugs reduce electromagnetic interference (EMI) that can disrupt electronics. Most modern vehicles require resistor plugs; non-resistor plugs are for older systems. |
Every product above was scored out of 10 on the same six-part rubric, then sorted into an S to C tier. We do not accept free units or payment for placement, and price or affiliate commission never factors into the score.
| Criterion | What we check | Weight |
|---|---|---|
| Core performance | The numbers that define the category: capacity, power, resolution, battery life, speed or output, taken from manufacturer specs and cross-checked against independent test data where it exists. | High |
| Build & reliability | Materials, warranty length, brand track record, and how often the model shows up in long-term failure or return complaints. | High |
| Real-world usability | Weight, dimensions, noise level, setup difficulty and day-to-day friction, drawn from owner reviews and published measurements. | Medium |
| Running cost | Ongoing costs beyond the purchase: subscriptions, consumables, energy use or maintenance, where they apply to the category. | Medium |
| Owner feedback | Patterns across aggregated verified owner reviews: recurring praise, recurring complaints, and whether the experience matches the marketing. | Medium |
| Value | What you get relative to the rest of the field at a similar price band, not an absolute price judgment. | Medium |
Sources: manufacturer spec sheets and manuals, retailer listing data, aggregated verified owner reviews, and published independent test results where available for the category.
Honesty note: We have not hands-on tested every product on this page. Where we have not personally used a product, its ranking is based on verified specs, aggregated owner feedback, availability and editorial comparison rather than a hands-on review. Hands-on impressions, when included in a product entry above, are clearly written from direct use.
We don't accept free units or payment for placement. Our rankings combine verified manufacturer specifications, real owner feedback and availability, compared on one transparent S to C rubric.