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15 April 2026 (updated) TOP 5 best spark plugs
Trying to find the best car spark plug? We’ve put together a list of customer favourites based on spark plug reviews and ratings, discussing the qualities and differences between the top brands.
Best spark plug brands: our top 5 picks
Champion spark plugs. The Champion brand has been a leading specialist in manufacturing OE spark plugs for over 110 years now, developing OEM and aftermarket parts for automotive, industrial, high-performance, and power sports applications.
If you’ve got a classic car or a smaller engine with lower requirements, it’s likely that you’ll need to use copper plugs to power it. The Champion Copper Plus components offer better performance and corrosion resistance than standard components, as well as high thermal conductivity.
The brand’s higher performance platinum and iridium products are designed with a v-trimmed ground electrode which allows them to direct the spark with greater precision. While aftermarket prices start at around £3, the higher quality parts are normally a tad more expensive.
NGK spark plugs. Since 1936, NGK has been a leading innovator of automotive spark plugs and oxygen sensors, which is why it’s no surprise that it has made it to the top of our list. The brand is dedicated to enhancing engine performance and its products are made to significantly increase firing power and reduce the risk of misfires, as well as ensure reliable cold starts.
The Iridium IX line is particularly popular due to its performance and longevity enhancing properties. The trivalent metal plating provides high protection against corrosion and fouling is prevented thanks to the extended insulator nose. The iridium range is designed for increased durability and fuel efficiency.
The latest Ruthenium HX products are some of its most advanced spark plugs, designed for optimal ignitability and minimal fuel consumption. They are able to withstand extreme temperatures and conditions, promising a longer service life than iridium components.
The main downside of NGK’s high-tech products is that they are at the higher end of the premium segment with prices typically ranging between £5 and £83.
Bosch spark plugs. Robert Bosch was the first to patent a fully functioning spark plug way back in 1902, and the manufacturer has been developing OE-quality parts ever since. It offers a highly diverse range of platinum, double platinum, iridium, double iridium, and silver components to meet the needs of all kinds of engines.
The manufacturer uses a laser welding technique to ensure that the parts last for longer and perform better. Additionally, the optimised electrode geometry of the parts ensures high ignitability with a reduced ignition voltage, meaning that less energy is required to produce a spark.
Its double iridium plugs are among the most popular in its high-performance range due to their excellent durability as their expected lifespan is 4x greater than that of the standard copper components.
DENSO spark plugs. Denso spark plugs are among the top-rated spark plugs on our platform, according to customer reviews. The Japanese brand is one of the top producers of these parts in the world, known for manufacturing highly reliable, long-lasting products. For example, its Platinum Longlife plugs have an expected lifespan of over 60,000 km.
In addition to a complete range of copper, iridium, and platinum parts, the brand also offers “twin-tip” components, which are able to provide greater spark energy to the cylinders, improving the ignition performance and combustion efficiency. The iridium TT model has a centre electrode size of just 0.4 mm, significantly enhancing performance and reducing energy consumption.
However, these parts also have a higher price tag than the standard components. In terms of performance, some say that its key competitor NGK comes out on top due to its advanced R&D, while Denso places greater focus on durability.
M14x1.25
DENSO Super Ignition Plug FK20HBR11 Spark plug for LEXUS GS, IS, LS
In stock
£20.99
Price per item
Ridex spark plugs. If you’re on a tight budget, Ridex is the brand for you, offering effective spark plugs at an unbeatable price. Prices range from £1 to £11, depending on the requirements and specifications of the vehicle model. The brand offers a wide range of reliable copper, nickel and platinum plugs for all kinds of applications.
They are designed to generate power efficiency and ensure stable combustion even in cold conditions. They are also highly resistant to corrosion and have high thermal conductivity. While they may not offer the same technology as some premium market products, Ridex spark plugs remain popular for their high value for money.
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