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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.

4604 DENSO Nickel TT K20TT Spark plug Spanner Size: 16
Parts Details
  • Spanner Size: 16
  • Product line: Nickel TT
  • Spark Plug: 1 - Earthed Electrode, Nickel Middle Electrode
  • Thread Length [mm]: 19
  • Connector type: Solid SAE
  • Tightening Torque [Nm]: 22
  • Diameter [mm]: 14
  • Weight [g]: 43
  • for OE number: 1WT318110
  • Gross Weight [g]: 46
  • DENSO: Spark plug
  • Item number: K20TT
  • Condition: New
Details
DENSO Spark plug
Article number: K20TT
£ 4,05
(Price per item)
price incl. 20% VAT, excl. delivery costs
SILZKFR8D7S NGK 95875 Spark plug M12 x 1,25, Spanner Size: 14 mm
Parts Details
  • Spanner Size: 14 mm
  • Spark Plug: Ring type connector (cup-shaped), Iridium Middle Electrode, 1 - Earthed Electrode, Interference Suppression 1 kOhm, with gasket seat
  • Thread Length [mm]: 26,5
  • Spark Position [mm]: 5,0
  • Thread Size: M12 x 1,25
  • NGK: Spark plug
  • Item number: 95875
  • Condition: New
Details
NGK Spark plug
Article number: 95875
£ 11,29
(Price per item)
price incl. 20% VAT, excl. delivery costs
IZFR6P7 NGK 97153 Spark plug M14 x 1,25, Spanner Size: 16 mm
Parts Details
  • Spanner Size: 16 mm
  • Spark Plug: Iridium Middle Electrode, 1 - Earthed Electrode, Interference Suppression 1 kOhm, with gasket seat, Fixed SAE connector
  • Thread Length [mm]: 19,0
  • Spark Position [mm]: 7,0
  • Thread Size: M14 x 1,25
  • NGK: Spark plug
  • Item number: 97153
  • Condition: New
Details
NGK Spark plug
Article number: 97153
£ 13,05
(Price per item)
price incl. 20% VAT, excl. delivery costs
-52%
BERU UPT12P Spark plug M14x1,25, Spanner Size: 16 mm, Poly-V Tit, ULTRA TITAN
Parts Details
  • Supplementary Info: ULTRA TITAN
  • Electrode Gap [mm]: 0,75
  • Spanner Size: 16 mm
  • Spark Plug: 1 - Earthed Electrode, with gasket seat, Platinum Middle Electrode
  • Quality / Grade: Poly-V Tit
  • Thread Length [mm]: 19
  • Thread Size: M14x1,25
  • Connector type: SAE
  • Tightening torque from [Nm]: 20
  • Tightening torque to [Nm]: 30
  • Resistor from [kOhm]: 3
  • Resistor to [kOhm]: 10
  • BERU: Spark plug
  • Item number: UPT12P
  • Condition: New
Details
BERU Spark plug
Article number: UPT12P
RRP

RRP is the recommended retail price set by the manufacturer or importer of the product and provided by the manufacturer, supplier or retailer. AUTODOC displays the RRP (VAT incl.) for a product if it has been received from at least one supplier or another source that has such information.

£ 12,12
£ 5,76
(Price per item)
price incl. 20% VAT, excl. delivery costs
BKUR6ET-10 NGK 2397 Spark plug M14 x 1,25, Spanner Size: 16 mm
Parts Details
  • Spanner Size: 16 mm
  • Spark Plug: Nickel Middle Electrode, 3 - Earthed Electrode, Interference Suppression 1 kOhm, with gasket seat, Fixed SAE connector
  • Thread Length [mm]: 19,0
  • Spark Position [mm]: 5,2
  • Thread Size: M14 x 1,25
  • NGK: Spark plug
  • Item number: 2397
  • Condition: New
Details
NGK Spark plug
Article number: 2397
£ 7,04
(Price per item)
price incl. 20% VAT, excl. delivery costs

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.

NGK spark plugs

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.

Bosch spark plugs

-43%
12 F-6 LPPR2L BERU Z365 Spark plug 12 F-6 LPPR2L, M12x1,25, , ULTRA
Parts Details
  • Supplementary Info: ULTRA
  • Electrode Gap [mm]: 0,8
  • Spark Plug: 1 - Earthed Electrode, with gasket seat, Platinum Middle Electrode
  • Thread Length [mm]: 21,5
  • Thread Size: M12x1,25
  • Connector type: HS 6,4
  • Technical Information Number: 12 F-6 LPPR2L
  • Tightening torque from [Nm]: 15
  • Tightening torque to [Nm]: 25
  • Resistor from [kOhm]: 1
  • Resistor to [kOhm]: 2
  • BERU: Spark plug
  • Item number: Z365
  • Condition: New
Details
BERU Spark plug
Article number: Z365
RRP

RRP is the recommended retail price set by the manufacturer or importer of the product and provided by the manufacturer, supplier or retailer. AUTODOC displays the RRP (VAT incl.) for a product if it has been received from at least one supplier or another source that has such information.

£ 23,31
£ 13,26
(Price per item)
price incl. 20% VAT, excl. delivery costs
PLFER7A8EG NGK 94833 Spark plug M14 x 1,25, Spanner Size: 16 mm
Parts Details
  • Spanner Size: 16 mm
  • Spark Plug: Ring type connector (cup-shaped), Platinum Middle Electrode, 1 - Earthed Electrode, Interference Suppression 1 kOhm, with gasket seat
  • Thread Length [mm]: 26,5
  • Spark Position [mm]: 3,5
  • Thread Size: M14 x 1,25
  • NGK: Spark plug
  • Item number: 94833
  • Condition: New
Details
NGK Spark plug
Article number: 94833
£ 14,46
(Price per item)
price incl. 20% VAT, excl. delivery costs
ZFR5P-G NGK 6893 Spark plug M14 x 1,25, Spanner Size: 16 mm
Parts Details
  • Spanner Size: 16 mm
  • Spark Plug: Nickel Middle Electrode, 1 - Earthed Electrode, Interference Suppression 1 kOhm, with gasket seat, Fixed SAE connector
  • Thread Length [mm]: 19,0
  • Spark Position [mm]: 7,0
  • Thread Size: M14 x 1,25
  • NGK: Spark plug
  • Item number: 6893
  • Condition: New
Details
NGK Spark plug
Article number: 6893
£ 6,35
(Price per item)
price incl. 20% VAT, excl. delivery costs
PFR7S8EG NGK 1675 Spark plug M14 x 1,25, Spanner Size: 16 mm
Parts Details
  • Spanner Size: 16 mm
  • Spark Plug: Platinum Middle Electrode, 1 - Earthed Electrode, Interference Suppression 1 kOhm, with gasket seat, Fixed SAE connector
  • Thread Length [mm]: 19,0
  • Spark Position [mm]: 3,5
  • Thread Size: M14 x 1,25
  • NGK: Spark plug
  • Item number: 1675
  • Condition: New
Details
NGK Spark plug
Article number: 1675
£ 11,52
(Price per item)
price incl. 20% VAT, excl. delivery costs
-52%
0001445308 BERU ISOLATOR M14-225 Spark plug M 14-225, M14x1,25, Spanner Size: 21 mm
Parts Details
  • Electrode Gap [mm]: 0,6
  • Spanner Size: 21 mm
  • Product line: ISOLATOR
  • Spark Plug: 1 - Earthed Electrode, with gasket seat
  • Thread Length [mm]: 12,5
  • Spark Position [mm]: 1,32
  • Thread Size: M14x1,25
  • Connector type: M4
  • Manufacturer Restriction: TRABANT
  • Technical Information Number: M 14-225
  • Tightening torque from [Nm]: 20
  • Tightening torque to [Nm]: 30
  • BERU: Spark plug
  • Item number: M14-225
  • Condition: New
Details
BERU Spark plug
Article number: M14-225
RRP

RRP is the recommended retail price set by the manufacturer or importer of the product and provided by the manufacturer, supplier or retailer. AUTODOC displays the RRP (VAT incl.) for a product if it has been received from at least one supplier or another source that has such information.

£ 5,59
£ 2,67
(Price per item)
price incl. 20% VAT, excl. delivery costs

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.

DENSO spark plugs

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.

Top products related to this topic:

AUTODOC Bestsellers: parts at a good price

ZGR 6 STE 2 W BOSCH 0 242 140 560 Spark plug M 12 x 1,25, Spanner Size: 14
Parts Details
  • Electrode Gap [mm]: 0,9
  • Spanner Size: 14
  • Thread Length [mm]: 26,5
  • Spark Position [mm]: 6
  • Thread Size: M 12 x 1,25
  • Tightening Torque [Nm]: 23
  • Number of pins: 3
  • BOSCH: Spark plug
  • Item number: 0 242 140 560
  • Condition: New
Details
BOSCH Spark plug
Article number: 0 242 140 560
£ 11,66
(Price per item)
price incl. 20% VAT, excl. delivery costs
3297 DENSO Iridium SK20R11 Spark plug Spanner Size: 16
Parts Details
  • Spanner Size: 16
  • Product line: Iridium
  • Spark Plug: 1 - Earthed Electrode, Platinum Middle Electrode
  • Thread Length [mm]: 19
  • Connector type: Solid SAE
  • Tightening Torque [Nm]: 22
  • Diameter [mm]: 14
  • Weight [g]: 43
  • for OE number: 90919-01210
  • Country Specific Design: Japan
  • Gross Weight [g]: 46
  • DENSO: Spark plug
  • Item number: SK20R11
  • Condition: New
Details
DENSO Spark plug
Article number: SK20R11
£ 10,82
(Price per item)
price incl. 20% VAT, excl. delivery costs
SIZFR6B8EG NGK 96209 Spark plug M14 x 1,25, Spanner Size: 16 mm
Parts Details
  • Spanner Size: 16 mm
  • Spark Plug: Iridium Middle Electrode, 1 - Earthed Electrode, Interference Suppression 1 kOhm, with gasket seat, Fixed SAE connector
  • Thread Length [mm]: 19,0
  • Spark Position [mm]: 5,0
  • Thread Size: M14 x 1,25
  • NGK: Spark plug
  • Item number: 96209
  • Condition: New
Details
NGK Spark plug
Article number: 96209
£ 12,74
(Price per item)
price incl. 20% VAT, excl. delivery costs
BUR6ET NGK 3172 Spark plug M14 x 1,25, Spanner Size: 20,8 mm
Parts Details
  • Spanner Size: 20,8 mm
  • Spark Plug: Connector Type M4, Nickel Middle Electrode, 3 - Earthed Electrode, Interference Suppression 1 kOhm, with gasket seat
  • Thread Length [mm]: 19,0
  • Spark Position [mm]: 5,2
  • Thread Size: M14 x 1,25
  • NGK: Spark plug
  • Item number: 3172
  • Condition: New
Details
NGK Spark plug
Article number: 3172
£ 6,80
(Price per item)
price incl. 20% VAT, excl. delivery costs
-53%
BERU UPT8 Spark plug M14x1,25, Spanner Size: 21 mm, Poly-V Tit, ULTRA TITAN
Parts Details
  • Supplementary Info: ULTRA TITAN
  • Electrode Gap [mm]: 0,9
  • Spanner Size: 21 mm
  • Spark Plug: 1 - Earthed Electrode, with gasket seat
  • Quality / Grade: Poly-V Tit
  • Thread Length [mm]: 19
  • Thread Size: M14x1,25
  • Connector type: SAE / M4
  • Tightening torque from [Nm]: 20
  • Tightening torque to [Nm]: 30
  • Resistor from [kOhm]: 3
  • Resistor to [kOhm]: 10
  • BERU: Spark plug
  • Item number: UPT8
  • Condition: New
Details
BERU Spark plug
Article number: UPT8
RRP

RRP is the recommended retail price set by the manufacturer or importer of the product and provided by the manufacturer, supplier or retailer. AUTODOC displays the RRP (VAT incl.) for a product if it has been received from at least one supplier or another source that has such information.

£ 10,19
£ 4,78
(Price per item)
price incl. 20% VAT, excl. delivery costs
PFR6Q NGK 6458 Spark plug M14 x 1,25, Spanner Size: 16 mm
Parts Details
  • Spanner Size: 16 mm
  • Spark Plug: Platinum Middle Electrode, 1 - Earthed Electrode, Interference Suppression 1 kOhm, with gasket seat, Fixed SAE connector
  • Thread Length [mm]: 19,0
  • Spark Position [mm]: 3,5
  • Thread Size: M14 x 1,25
  • NGK: Spark plug
  • Item number: 6458
  • Condition: New
Details
NGK Spark plug
Article number: 6458
£ 12,48
(Price per item)
price incl. 20% VAT, excl. delivery costs
4603 DENSO Nickel TT K16TT Spark plug Spanner Size: 16
Parts Details
  • Spanner Size: 16
  • Product line: Nickel TT
  • Spark Plug: 1 - Earthed Electrode, Nickel Middle Electrode
  • Thread Length [mm]: 19
  • Connector type: Solid SAE
  • Tightening Torque [Nm]: 22
  • Diameter [mm]: 14
  • Weight [g]: 43
  • for OE number: 1WT2 18 110
  • Gross Weight [g]: 46
  • DENSO: Spark plug
  • Item number: K16TT
  • Condition: New
Details
DENSO Spark plug
Article number: K16TT
£ 4,50
(Price per item)
price incl. 20% VAT, excl. delivery costs
BUR6ET NGK V-Line 2876 Spark plug M14 x 1,25, Spanner Size: 20,8 mm
Parts Details
  • Spanner Size: 20,8 mm
  • Product line: V-Line
  • Spark Plug: Connector Type M4, Nickel Middle Electrode, 3 - Earthed Electrode, Interference Suppression 1 kOhm, with gasket seat
  • Thread Length [mm]: 19,0
  • Spark Position [mm]: 5,2
  • Thread Size: M14 x 1,25
  • NGK: Spark plug
  • Item number: 2876
  • Condition: New
Details
NGK Spark plug
Article number: 2876
£ 6,97
(Price per item)
price incl. 20% VAT, excl. delivery costs
IFR7X7G NGK 91039 Spark plug M14 x 1,25, Spanner Size: 16 mm
Parts Details
  • Spanner Size: 16 mm
  • Spark Plug: Iridium Middle Electrode, 1 - Earthed Electrode, Interference Suppression 5 kOhm, with gasket seat, Fixed SAE connector
  • Thread Length [mm]: 19,0
  • Spark Position [mm]: 3,5
  • Thread Size: M14 x 1,25
  • NGK: Spark plug
  • Item number: 91039
  • Condition: New
Details
NGK Spark plug
Article number: 91039
£ 14,55
(Price per item)
price incl. 20% VAT, excl. delivery costs
ZFR5F NGK 5165 Spark plug M14 x 1,25, Spanner Size: 16 mm
Parts Details
  • Spanner Size: 16 mm
  • Spark Plug: Nickel Middle Electrode, 1 - Earthed Electrode, Interference Suppression 5 kOhm, with gasket seat, Fixed SAE connector
  • Thread Length [mm]: 19,0
  • Spark Position [mm]: 5,0
  • Thread Size: M14 x 1,25
  • NGK: Spark plug
  • Item number: 5165
  • Condition: New
Details
NGK Spark plug
Article number: 5165
£ 10,08
(Price per item)
price incl. 20% VAT, excl. delivery costs

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