Despite its small size, a spark plug plays an important role in your engine. So naturally, you would want to own the best type of spark plug. There are numerous options currently available in the market, making it understandable if you would have a hard time choosing what would best suit your engine. However, do not fret for too long because this review could help you decide on what spark plug to get.
As it has already been mentioned, there are a variety of choices in the industry when it comes to spark plugs. Most of them look promising, while some might not probably be worth buying. We have narrowed down all of the spark plugs we have come across to the top 5 best, based on its Amazon reviews, assuring you that whatever you choose among the list is favorable.
What is the Best Spark Plug to Buy?
Our Top Pick
NGK 6619 Iridium Spark Plugs
Not only does it come in a multi-pack, but this spark plug is also manufactured with premium coating. These two features alone made us consider this spark plug as the best overall in the market, assuring its consumers that it is able to give an enhanced performance alongside increased longevity, as well. Equipping yourself with this spark plug could guarantee you more smooth drives and better performance for your tools.
The 5 Top-Rated Spark Plugs
Best Overall - NGK 6619 Iridium Spark Plugs
Runner Up - Bosch 4417 Platinum+4 FGR7DQP Spark Plug
Best Budget Buy - Denso (4503) PK16TT Platinum TT Spark Plug
Best Iridium Spark Plugs - NGK 5464 BR5EIX-11 Iridium IX Spark Plug
Best Platinum Spark Plugs - NGK (7092) BKR6EGP G-Power Spark Plug
NGK 6619 Iridium Spark Plugs - Best Overall Spark Plugs
NGK 6619 Iridium Spark Plugs LFR6AIX-11 - 6 PCSNEW 
The NGK 6619 Iridium Spark Plugs definitely deserves the top spot and would be the best overall spark plug as per reviews written on Amazon. This product is convenient, first-rate, and would definitely be worth your money.
This is able to fit in numerous types of engines. If you are constantly worrying about whether a spark plug would fit in your engine or not, then you should most possibly acquire this product. Guaranteed, it is able to fit in any type of engine that you would have with you. It could also be convenient when you find yourself needing to replace multiple plugs, as this spark plug is multi-pack.
This feature would not fall under the cons section if you find yourself thinking that your need to replace multiple plugs is not a necessity because you could set aside the extras and use it when required.
This spark plug is affordable, being sold at an approximate price of seven dollars for each plug. That price is definitely considerable, as the NGK 6619 Iridium is sure to let you enjoy miles and miles of smooth driving. Not to mention, it has better performance in comparison to OEM ones.
To top it off, this product has been reviewed by an estimated 900 people on Amazon and has received an average of 4.6 out of 5 stars, as well. The purchasers are more than satisfied with the service this spark plug has given them and have said that it made all of their drives more enjoyable.
NGK 6619 Iridium Spark Plugs Key Features:
- In comparison to copper and platinum plugs, the Iridium product lasts longer
- The spark plug has an increased efficiency because of its prime electrode wire
- The spark plug is also pre-gapped at 0.43
Bosch 4417 Platinum+4 FGR7DQP Spark Plug-Runners Up
Bosch 4417 Platinum+4 FGR7DQP spark plug(Pack of 1) 
The Bosch 4417 Platinum+4 FGR7DQP Spark Plug is sure to be a first-rate spark plug, especially from Bosch. The moment people would hear that the product came from Bosch, it is sure that their standards would be raised. Consumers know just how promising this product could be since every item made by Bosch is known to be worth buying. It is a trustworthy company when it comes to manufacturing spark plugs.
The first noticeable thing about this spark plug is that its appearance alone is different from the other ones in the market. It does not end with the new altered design because this spark plug has been produced to have better performances than the other plugs. It has been proven that this plug is much easier to switch out when needed, as well.
This kind of spark plug quality is expected to be pricey, however. At an estimated cost of $18, though, you will be able to experience an exemplary performance of a spark plug from the Bosch brand, as expected by it. Rest assured that the price offered to you by Bosch is worth it, considering the features that come with the spark plug, as well.
With approximately 200 people rating this product on Amazon, it has received an average of 4.6 out of 5 stars. These reviews have noted how much the Bosch spark plug is worth the cost as it performs better than those that come at a lower price.
Bosch 4417 Platinum+4 FGR7DQP Spark Plug Key Features:
- The spark plug makes use of electrodes that are 4 yttrium-enhanced
- The design of this spark plug makes it low maintenance
- The longevity of the spark plug is increased
Denso (4503) PK20TT Platinum TT Spark Plug - Budget Pick
Sale 
Some people think that a cheap product is not worth their money, but the Denso (4503) PK16TT Platinum TT Spark Plug begs to differ. At an affordable cost, this spark plug is still able to give you its best services and let you drive your car smoothly. In comparison to other iridium spark plugs in the market, this one would probably have less longevity, but that does not mean that it wouldn’t be worth the price.
To give you enhanced performance, the Denso PK16TT Platinum utilizes an electrode tip and a platinum disc. Mechanics have highly recommended this spark plug to consumers, as well, since it is compatible with most models and types of vehicles. You may need to re-gap this product if it is not compatible with the vehicle you own, but aside from that, there are no more issues regarding this spark plug.
If you are on a tight budget, but would still opt for a spark plug that comes of great quality, then the Denso PK16TT would be the perfect one you are in search of. It has received an average of 4.5 out of 5 stars from 400 people leaving their reviews on Amazon, and the comments left have stated that they have not been disappointed by this spark plug, despite it being less expensive than the other ones available in the market.
Denso (4503) PK16TT Platinum TT Spark Plug Key Features:
- The spark plug is integrated with an insulator that is a purified alumina powder
- The electrode of the spark plug stretches to a width of 11 mm
- The spark plug comes with platinum twin tips
Best Iridium Spark Plugs:
NGK 5464 BKR5EIX-11 Iridium IX Spark Plug
NGK Iridium IX Spark Plug, Pack of 4 
Since this spark plug has been specially designed for vehicles that are of high performance, the NGK 5464 BKR5EIX-11 Iridium IX Spark Plug easily became our best pick among the other iridium spark plugs in the market. Of course, its other features have been kept in mind, as well, along with the reviews that have been left on Amazon.
This spark plug is thin, integrated with a 0.6 mm electrode that helps in improving the engine power along with the performance. Flashovers are prevented thanks to its corrugated ribs on the insulator, as well. To make everything else better, this product comes with improved ignitability and throttle response.
This product is quite easy to switch out, according to the reviews left by the consumers. Aside from that, the plugs are pre-gapped in the specified size. Because this product was manufactured from Japan, it is expected that it can give only high-quality performance, making the drives of your vehicle easier than it used to be. It would also work well for the engines of your equipment of tools, as well.
You may find yourself sticking to this product, or maybe come back to it after you have tried out the other products in the industry.
It has received an average of 4.5 stars on Amazon reviews and comments left by 250 satisfied consumers. The NGK 5464 BKR5EIX-11 Iridium IX would cost you an estimated of $6, which, we must say, is not at all expensive but would definitely not fall under the cheap category as well.
NGK 5464 BKR5EIX-11 Iridium IX Spark Plug Key Features:
- It has no combustion gas leakage because of its triple gasket seal
- The spark plug is equipped with trivalent metal plating
- Fouling is prevented because this spark plug has been integrated with a longer insulator nose
Best Platinum Spark Plugs: NGK (7092) BKR6EGP G-Power Spark Plug
The NGK (7092) BKR6EGP G-Power Spark Plug would be ideal in terms of enhanced performance and engine power, which is why we chose it as the best platinum spark plug along with its counterparts in the market. These enhanced features are possible thanks to its thin 0.6mm tip. In addition to that, it also has increased longevity because it has a longer insulator nose that helps with preventing fouling.
If you need to replace multiple plugs, then this product’s multi-pack feature would sure be convenient for you. It also comes in a single pack, though, if you do not have the need to switch multiple plugs. This spark plug is expected to fit numerous models and types of cars and also come pre-gapped. You still might want to double-check its dimensions before installing them, however, as some consumers have left comments saying that their platinum plug’s dimensions are off.
It is not surprising that this product has received 4.1-star ratings on Amazon, with an estimated 250 people leaving their reviews. It has a price of $4, which we see as a very affordable and budget-friendly. The product is sure to be worth buying at this cost.
NGK (7092) BKR6EGP G-Power Spark Plug Key Features:
- The spark plug comes with a thin, tin tip that measures 0.6 mm It provides increased longevity
- The spark plug has a better durability and increased longevity
- The spark plug has a trivalent metal plating
Who Should Buy a Spark Plug?
As long as you run any type of gas-powered motor, then you should definitely equip yourself with your own spark plug. Make sure that it is of high quality as well. Purchasing a spark plug is not limited to vehicle-owners such as cars, but it would also be needed for other equipment such as chainsaws, lawn mowers, and generators.
Diesel-powered machines do not require the need for spark plugs. It is exclusive only to motors that have gasoline as its fuel.
You may need to replace your spark plug once you have noticed that your engine has difficulties in starting or may have a slowed performance in comparison to its initial ones. Make sure that the spark plug you replace would guarantee you enhanced performance and increased longevity.
Important Features to Consider
Just like any other material, some spark plug products may be of good quality, while its other counterparts would most likely leave you in disappointment and not be worth all the costly money. That is why it is highly recommended that you check if a spark plug product would be worth buying at the price it offers and give you its best performance for a long duration.
There are things you have to consider, of course, so that you would know if a spark plug you’ve got your eyes on would be worth the purchase:
•Material. Most spark plugs are manufactured from copper. Though there are some in the market which is made from platinum or iridium instead. The best material to use for your engine would depend on what’s written on your owner’s manual. If you do not have it with you anymore, it is best that you consult an expert (most likely someone from an auto parts store) and ask about the recommended different types of spark plug. If you are aware that your vehicle or tool came with a premium type of spark plug, keep in mind that you should not settle for a downgrade when replacing it, as doing this would only degrade the performance and durability well. Overall, iridium would be the best material for spark plugs, but this type of material is expected to come at a high price, as well.
•Long-lasting. If an item is of good quality, then needless to stay, it will provide you service and great performance for a long period of time. If you settled for a not-so-promising product, however, expect that you would find yourself needing to replace your spark plug every so often, which would definitely be a hassle and would cost you more money in the long run. Copper spark plugs are the standard material, while the premium ones would be platinum, yttrium, and iridium and could guarantee increased longevity as well as enhanced performances.
•Adjustable vs. fixed gap. If you have noticed that there is an ample amount of space between your spark plug’s center and its side electrodes, keep in mind that that would be your spark plug gap. When choosing a spark plug with a fixed gap, make sure that you purchase the right size. For adjustable gaps, always double-check if it is of the right size before installing.
•Price point. A product’s price would depend on its quality, but always remember that some of the best products could still cost less than their counterparts. Decide on how much you are willing to spend for a spark plug; prices vary, but most of them range from $1 to $15 and could exceed, as well.
What is a spark plug, and how does it function?
It is a component of an ignition system that is integrated within a motor. It functions by igniting either an air or fuel mixture. As long as there is a high amount of voltage supplied through the device, electrical energy would be able to transmit through itself and would jump the gap between the plugs’ firing ends.
Do spark plugs have an effect on an engine’s performance?
Yes, spark plugs can contribute to how an engine performs, either making it better or worse. Of course, you should always aim for the better. If you equip yourself with a rather worn-out spark plug or one that does not have the most promising features, then do not be surprised if you find your engine working not as good in comparison to other engines or if it does not meet your expectations. This is, of course, a great deal of contrast with a spark plug. and your engine not working properly, then it is a sign for you to have your spark plug checked and replaced. It is best that you replace your spark plug with a better one.
How would you know if you have a malfunctioning spark plug?
Bad spark plugs or the ones that have a lot of performance issues are not unusual. Once you have installed your spark plug, always be in the checkout for the common symptoms that would indicate that you have a foul product with you.
The most common symptom would be misfiring. You would know that misfiring is present when the engine makes a coarse sound or noise, which would either be the banging or clunking type. There would be times that the spark would not be strong enough to have the air or fuel mixture burn in the combustion chamber; this is caused by poor fuel mileage and would have your engine require more fuel.
Another symptom would be the lack of acceleration and/or torque. If you find difficulty in starting your engine, you most likely have a bad spark plug installed, as well.
You could also check the health of your spark plug through its color. Checking on this often could tell you the spark plug’s current status or if it needs immediate attention or any sort of remedies.
Take, for example, a white spark plug. If you have a white spark plug with you, it means that it is running too hot. A black spark plug can state that the spark is frail or is overloaded with a rich fuel mixture. If you have a wet spark plug with you, it means that your engine is flooding, or you have a bad ignition cable.
How often do you have to change your spark plugs?
If you are new to taking care of your engine, you must think that you have to change your spark plugs now and then, or else it would be worn out. This does not stand true, however, because how frequently you must change your spark plugs would vary on what kind of spark plug you have with you.
The need to change your spark plug highly depends on numerous factors. You have to take note of your running hours, oil leaks, mileage, high revs, and the type of spark plug you are currently in use of, as well. Most manufacturers of these spark plugs have their own recommendations on how often you should change your spark plug, but usually, this would be 30,000 miles.
You must definitely have your spark plugs changed once you notice that they are giving you bad performances because this would be an obvious symptom that your spark plugs are malfunctioning and need to be replaced.
Other Spark Plugs We Have Reviewed
We have reviewed an additional 20 spark plugs. These had not made it into our top 5 list, but rest assured that these products are guaranteed to be worth listing as an option of great spark plugs in comparison to the other ones available in the market. The list below contains the necessary information for your search of the right spark plug.
Iridium Spark Plugs
ACDelco 41-103 Professional Iridium Spark Plug
Sale ACDelco GM Original Equipment 41-103 Iridium Spark Plug 
This spark plug stands out with its iridium fine-wire electrode. This electrode is able to provide excellent engine idle stability and is guaranteed to give your engine a smooth performance, as well.
Key Features:
- This spark plug is reliable cold starting
- It is able to grant you quick acceleration
•The ACDelco 41-103 has a unique design which contributes assistance to prevent combustion leakages
NGK BKR7EIX Iridium IX Spark Plug
NGK 2667 Iridium IX Spark Plug. Part# BKR7EIX 
The NGK BKR7EIX Iridium IX Spark Plug is able to give you extreme ignitability, as well as improved throttle response and amazing anti-fouling for enhanced and smoother performance.
Key Features:
- This spark plug is available in either single or multipacks
- It includes a 0.6 mm laser welded fine iridium tip
- Combustion gas leakage is prevented due to its triple gasket seal
NGK (6994) Laser Iridium Spark Plug
NGK Spark Plugs (USA),Inc. IZFR6K11 Spark Plugs Izfr6K11 4Pack 
This spark plug has been specifically designed to have improved durability and increased longevity. Aside from being reliable, the product also highlights a laser-welded iridium center electrode tip and a solid copper core.
Key Features:
- The product is available in either single or multipacks
- It is suitable for and compatible with any type of vehicle makes and models
- The spark plug features a solid copper core and nickel tipped electrode
NGK 6418 BKR6EIX Iridium IX Spark Plug
NGK # 6418 Iridium Spark Plugs BKR6EIX - 4 PCS NEW 
The NGK 6418 BKR6EIX Iridium IX Spark Plug would most please the spark plug performance enthusiasts. It comes with improved ignitability as well as improved throttle response and promising anti-fouling features.
Key Features:
- The spark plugs best suits with engines that are of high-performance
- It comes with superior anti-corrosion as well as anti-seizing properties
- Combustion gas leakage is prevented due to its triple gasket seal
Motorcraft SP534 Spark Plug
This spark plug brandishes its Motorcraft name, but in fact, it is manufactured by NGK. With that said, this spark plug promises you the best of its performances and will be able to give you and your engine quality service, as well. To top it off, it is affordable.
Key Features:
- It is suitable for and compatible with various types of vehicle makes and models
- The spark plug has been pre-gapped for easier use
- It is ideal for vehicles with the EcoBoost feature
ACDelco 41-110 Professional Iridium Spark Plug
Sale ACDelco GM Original Equipment 41-110 Iridium Spark Plug 
This iridium spark plug has a convenient 8-pack feature that is able to provide you with an economical solution when it comes to replacing your spark plugs. It comes at an affordable price while still being reliable for a smooth and consistent performance.
Key Features:
- The spark plug has been pre-gapped to 0.40
- It features a one-piece suppressor seal that assists in blocking radio frequencies which could affect the vehicle electronics
- It has an iridium fine-wire electrode
Platinum Spark Plugs
NGK 7090 BKR5EGP G-Power Spark Plug
NGK 7090 BKR5EGP G-Power Spark Plug, Pack of 4 
This product could be bought either in single or multi-pack. Equipping yourself with this spark plug could help in improving your vehicle’s fuel efficiency, lower emissions, and give you quicker starts, as well. Aside from that, it comes at an affordable price and is sure to fit your budget.
Key Features:
- This spark plug has a 0.6 mm laser welded fine Platinum tip
- It has corrugated ribs on the insulator, which assists in preventing flashovers
- The product also features a trivalent metal plating
NGK (3199) BKR6EQUP Laser Platinum Spark Plug
NGK (3199) BKR6EQUP Laser Platinum Spark Plug, Pack of 1 
This spark plug has been designed to come in great quality and reliability. The materials that were used in manufacturing this spark plug are durable, as well, assuring you that this product has great durability and improved longevity for miles of driving, and smooth engines of your equipment, too.
Key Features:
- It has been designed to be resistant to corrosion and abrasion
- This spark plug has a ceramic insulator with a copper core
- It features a triple interior seal
Motorcraft SP-515 Spark Plug
This spark plug brandishes its Motorcraft name, but in fact, it is manufactured by NGK. With that said, this spark plug promises you the best of its performances and will be able to give you and your engine quality service, as well. To top it off, it comes at an affordable price.
Key Features:
- Ford Motor Company has designed, engineered, and recommended this spark plug
- It has been pre-gapped for an easier use
- The spark plug’s platinum suggests a high melting point
NGK (3403) TR55GP G-Power Spark Plug
NGK (3403) TR55GP G-Power Spark Plug, Pack of 1 
Aside from being a double platinum alloy spark plug, this product provides excellent performance and enhanced fuel efficiency over copper models and assists in lowering vehicle emissions. It is able to give quicker starts to your engines, as well.
Key Features:
- It comes with a 0.6 mm laser welded fine Platinum tip
- The spark plug also has a trivalent metal plating
- Combustion gas leakage is prevented dude to its triple gasket seal
Copper Spark Plugs
Champion RC12YC (71G) Copper Plus Small Engine Replacement Spark Plug
Champion RC12YC (71G) Copper Plus Small Engine Replacement Spark Plug (Pack of 3) 
This copper spark plug is able to assist in resisting fouling while giving a consistent ignition source for your motor needs. It also comes at an affordable price, sure to fit your budget.
Key Features:
- The spark plug is resistant to corrosion
- It is ideal for marine applications
- The spark plug has been manufactured to ISO and SAE performance standards
Arnold First Fire FF-10 Replacement Spark Plug
Arnold Corporation FF-10 First Fire Replacement Spark Plug 
This replacement spark plug is able to give you its best performance as it proves itself to be reliable and consistent, as well. Motor enthusiasts find this product reliable as it does not only give you the best kind of service that a spark plug could give you, but it also comes at a low price, being made affordable for every amount of budget you have with you.
Key Features:
- It is available in various models
- This replacement spark plug is fouling resistant
- It is made to be compatible with numerous major brands
Champion RCJ6Y (852) Copper Plus Small Engine Replacement Spark Plug
Sale 4 Pack Genuine Champion RCJ6Y Spark Plug Copper Plus 852 
This copper spark plug is able to resist fouling thanks to its superior corrosion resistance. Guaranteed, it is also designed to meet your expectations and give you the best of its performances, as well.
Key Features:
- It is reliable and is able to give you a splendid performance
- This spark plug is also suited for lawn and garden and snow equipment
- Purchasing this product comes with a step-by-step instruction
Champion RDZ4H (979) Copper Plus Small Engine Replacement Spark Plug
Champion Copper Plus Small Engine 979 Spark Plug (Carton of 1) - RDZ4H 
This copper spark plug has been designed specifically for equipment and vehicles with small engines. This makes the product compatible and suitable for lawn and garden, and snow equipment, as well.
Key Features:
- It assists in resisting fouling
- This spark plug is able to give superior corrosion resistance
- It comes with an increased conductivity for reliable overall wear
NGK (4929) DPR8EA-9 Standard Spark Plug
NGK Spark Plug, NGK DPR8EA-9, ea, 1 
This product can come in either single or multi-packs. It highlights a solid copper core for an enhanced spark. It is also integrated with a longer insulator nose that assists in the prevention of fouling.
Key Features:
- The insulator has corrugated ribs that help in preventing flashovers
- Its shell is zinc dipped, giving in anti-corrosion properties
- Combustion gas leakage is prevented due to its triple gasket seal
Champion RJ19HX (973) Copper Plus Spark Plug
Champion RJ19HX (973) Copper Plus Small Engine Spark Plug, Pack of 4 
This copper spark plug is able to provide you with superior corrosion resistance to make it resistant from fouling while also giving you a trustworthy, promising performance.
Key Features:
- •It is suitable for lawn and garden and snow equipment
- •Purchasing this product comes with step-by-step instructions
- •It has over a hundred years of innovation
E3 Spark Plug E3.36 Powersports Spark Plug
E3 Spark Plugs E3.36 Powersports Spark Plug, Pack of 1 
It is suitable for numerous vehicle makes and models. This spark plug has been manufactured to focus on eliminating carbon deposits in order to give it a longer plug life, as well.
Key Features:
- This product comes with a warranty of 5 years
- It is able to give 100,000 miles of performance
- It can help improve power and fuel efficiency
NGK 7131 BPR6ES Standard Spark Plug
NGK 7131 BPR6ES Standard Spark Plug, Pack of 4 
This spark plug has a multi-pack design and can give you enhanced heat dissipation and conductivity. Aside from that, it is also manufactured with a long insulator nose that assists in fouling prevention.
Key Features:
- The insulator has corrugated ribs that help in preventing flashovers
- Its shell is zinc dipped, giving in anti-corrosion properties
- Combustion gas leakage is prevented due to its triple gasket seal
Champion RE14MCC4 (570) Copper Plus Spark Plug
Sale Champion Copper Plus 570 Spark Plug (Carton of 1) - RE14MCC4 
This spark plug comes at a budget-friendly price while highlighting a patented Ultraseal coated shell feature for maximum corrosion resistance.
Key Features:
- It is suitable for various vehicle makes and models
- It has been pre-gapped for easier use
- The spark plug has been manufactured to ISO and SAE performance standards
