Top 10 Best Spark Plugs of 2019 – Reviews

Despite their diminutive form, spark plugs are among the essential components of any modern vehicle. These plugs don’t just ensure that your car runs smoothly but also make so that you won’t have any problems with the ignition long-term, not even in cold weather. While spark plugs have indeed changed in shape ever so slightly over time, their intended purpose has remained pretty much the same. That said, finding a good one can be tricky, mostly because of how inexpensive they are, which is also the reason why so many sub-par models make their way onto the market. To help you through, we put together a list of the ten best spark plugs money can buy.

Best Spark Plugs – Top List

10. Autolite XP5224

The Autolite Xtreme Performance 5224 Iridium Spark Plug has a technologically improved construction when compared to other spark plugs, thanks to an iridium-enhanced .6mm fine-wire design and unique platinum side-wire innovation, ensuring an improved durability plus a more effective ignition and consistently impressive performance. It is a premium-grade spark plug that also boasts a sturdy nickel-coated shell and an iridium-enhanced center electrode for superior efficiency, reliability.


9. Autolite APP104

With a full, functional platinum tip, the Autolite APP104 spark plug provides virtually zero gap erosion, a great highlight when factoring how frequent such a risk can be. The plug also supports optimized engine performance by ensuring efficient fuel consumption. Moreover, it has a necked-down center electrode whose design supports quicker and cleaner ignition and combustion yet using less voltage.


8. NGK (4548) CR9EK

Featuring a quality copper core that provides a faster, greater spark and superior heat conductivity and dissipation, this spark plug model stands apart not just as one among the most effective models yet also among the most affordable. Its relatively long insulator nose ensures no fouling, while corrugated ribs integrated on the insulator averts flashovers. Again, it has dual ground electrodes which offer a greater spark consistency than what other spark plugs in its price range may.


7. DENSO # 3297 – SK20R11

Another one by DENSO, the SK20R11 has a proprietary iridium alloy build that helps provide a more reliable spark and heat conductivity. It delivers this by utilizing an innovative 360-degree laser welding process which is not like the other plug models out there when it comes to conductivity and consistency. Moreover, this particular plug is about 6-7 times harder and nearly 8 times sturdier than traditional platinum spark plugs, delivering even greater durability.


6. NGK (6953) BKR5E-11

With a design that supports a lot wider heat range operation than most other plugs, this BKR5E-11 spark plug stands apart as one of the few models that offer resistance to carbon build-ups and pre-ignition. Its high-quality alumina ceramics ensure greater heat transfer plus electrical insulation, while also eliminating possible combustion gas leakage. Moreover, trivalent metal plating provides commendable anti-seizing, anti-corrosion properties.


5. Bosch 4417 Platinum+4

The Platinum+4 spark plug by the famous Bosch features a uniquely innovative firing technology, combining the benefits of surface air gap function, nickel-yttrium 4 ground electrodes, and a functional heat-fused center electrode integrating pure platinum to ensure optimal engine performance, quicker and smoother acceleration, and peak fuel efficiency.


4. ACDelco 41-993 Professional

It is its unique, assured engine idle stability, as well as a much smoother overall performance, that makes this spark plug stand apart. All this is ensured by its small but highly efficient electrode that delivers a quite reliable cold-starting and also faster acceleration while not compromising the structural decency of the plug in any way. It further boasts a 1-piece suppressor for blocking radio frequencies which would otherwise inhibit your vehicle’s electronics.


3. Denso (3297) SK20R11

With an enduring iridium construction that boasts a really high melting point, the SK20R11 spark plug is regarded as among the most durable models today. It, therefore, offers much better fuel efficiency and acceleration than most other models in the fray. Moreover, it ensures a stable combustion during engine idling, a wonderful feature for a spark plug of the day. It further has a design that extends its durability to a remarkable value.


2. Denso (4504) PK20TT

Another great option, this Denso’s Platinum PK20TT Spark Plug has a twin-tip design featuring an 11mm quality platinum center electrode with 11mm premium titanium improved ground electrode. Including a purified alumina-powder insulator, this great plug delivers exemplary dielectric power and thermal conductivity, enabling it to withstand constant use. As such, it ensures higher fuel efficiency, quicker start times and better acceleration.


1. NGK (5464) BKR5EIX-11

Created for consistent, peak performance, this is doubtless one among the most dependable spark plugs available on the market today. It has among other features a much longer insulator nose relative to most other models, thus preventing fouling. Again, on the insulator are corrugated ribs for preventing flashovers, while a triple gasket seal helps in eliminating combustion gas leakage maximally. Moreover, it has trivalent metal plating for ensuring great anti-corrosion, anti-seizing qualities, recommending it as one of the very best spark plugs out there.


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