Bosch 8185 Spark Plug
OE Quality 60-Day Returns
Bosch
 OE Fine Wire Double Platinum

Bosch 8185 Spark Plug

Brand Bosch 8185
Resistance 8000
Ground Electrode Tip Design Tapered
Ground Configuration J-gap
Ground Electrode Core Material Nickel
Electrical Terminal Type Non-removable nut
Center Electrode Core Material Copper
Center Electrode Tip Material Platinum
Pre-Gap Size .8
Ground Electrode Quantity 1
Hex Size 14
Manufacturer Heat Range 5
Seat Type Flat
Reach 26.5
Insulator Material Ceramic
Resistor Type Yes
Ground Electrode Tip Material Platinum
Hex Type Bi-hex
Center Electrode Design Fine wire
9746 Yes
Automotive Item Weight (lbs) 0.088185 lb
Insulator Type Projected
Outdoor Power Equipment Application No
Package Contents Spark plug
Package Quantity 1
Product Length 3.36811 in
Product Width 0.669291 in
Resistor Yes
Short Style No
Spark Plug Type 4-cycle
Thread Diameter (Spark Plug) 12 mm
Product line OE Fine Wire Double Platinum
Fits BMW and Rolls-Royce · 188 vehicles

OE fine wire design. Delivers precise ignition and long service life.

Double platinum construction. Helps reduce gap erosion for lasting performance.

Resistor spark plug. Supports cleaner operation and reliable ignition.

$19.20Free shipping
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Order total $19.20
Free shipping to the continental U.S.
Free returns within 60 days if it doesn't fit when fitment is verified.
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Bosch OE Fine Wire Double Platinum Spark Plug 8185

Bosch 8185 is an OE Fine Wire Double Platinum spark plug built for steady ignition performance and extended service life. It uses platinum on the center electrode and a platinum inlay on the ground electrode to help reduce gap erosion and maintain consistent firing over time.

Compatible with select BMW and Rolls-Royce applications, including BMW 335i, 535i, X5, X6, and Rolls-Royce Ghost models, this Bosch spark plug follows Original Equipment specifications for double platinum designs. The fine wire center electrode, projected ceramic insulator, and resistor construction support stable combustion and reliable secondary ignition performance.

Key Features

  • OE Fine Wire Double Platinum design for long service life
  • Platinum center electrode tip and platinum ground electrode tip
  • Fine wire center electrode design for consistent spark delivery
  • 8000 ohm resistor construction
  • Projected ceramic insulator with flat seat
  • J-gap ground configuration with tapered ground tip
  • 12 mm thread diameter, 14 mm hex size, 26.5 mm reach
  • Pre-gapped to .8 for the specified application

Product Details

Bosch OE Fine Wire Double Platinum 8185 is engineered around double platinum electrode technology, with platinum used at both the firing point and the ground electrode contact area. That construction helps limit wear at the gap, which is important in turbocharged and higher-output engines that demand stable ignition under load. The copper core center electrode, nickel ground electrode core, and ceramic insulator support dependable heat transfer and electrical performance.

This part number is used across a wide range of BMW and Rolls-Royce vehicles, including BMW 640i Gran Coupe, 740i, 750i, X1, X3, X4, and Rolls-Royce Dawn, Ghost, and Wraith applications. Bosch 8185 is a direct-fit style spark plug for vehicles specified with this OE fine wire double platinum configuration.

What It Helps Address

  • Misfire concerns caused by worn spark plug electrodes
  • Hard starting related to weak ignition output
  • Rough idle from inconsistent spark delivery
  • Loss of throttle response from degraded plug performance
  • Maintenance intervals shortened by rapid gap erosion

Installation Notes

Verify the engine calls for a 12 mm thread, flat seat, 26.5 mm reach, and .8 pre-gap before installation. Check the existing plug specification against the vehicle service information, especially on BMW and Rolls-Royce engines that use OE fine wire double platinum plugs. Use proper spark plug removal and torque procedures to avoid thread or insulator damage.

For fitment searches, this part is commonly referenced for BMW 335i spark plug replacement, BMW X5 spark plug service, and Rolls-Royce Ghost ignition maintenance. Part number 8185 should be matched to the exact engine application before installation.

Quality Assurance

Bosch builds this spark plug to meet Original Equipment specifications for double platinum applications. The OE-style electrode layout and resistor design are intended to support consistent ignition performance and long-term durability in the specified vehicles.

Related reading

This part fits 188 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelSubmodelDrive TypeLitersCylindersNotes
2019BMW640i Gran Coupe——3.0LL6OE Fine Wire Double Platinum
2019BMW640i xDrive Gran Coupe——3.0LL6OE Fine Wire Double Platinum
2019BMWX6——3.0LL6OE Fine Wire Double Platinum
2018BMW640i——3.0LL6OE Fine Wire Double Platinum
2018BMW640i Gran Coupe——3.0LL6OE Fine Wire Double Platinum
2018BMW640i xDrive——3.0LL6OE Fine Wire Double Platinum
2018BMW640i xDrive Gran Coupe——3.0LL6OE Fine Wire Double Platinum
2018BMWX5——3.0LL6OE Fine Wire Double Platinum
2018BMWX6—RWD3.0LL6OE Fine Wire Double Platinum
2018Rolls-RoyceDawn——6.6LV12OE Fine Wire Double Platinum
2018Rolls-RoyceGhost——6.6LV12OE Fine Wire Double Platinum
2018Rolls-RoyceWraith——6.6LV12OE Fine Wire Double Platinum
2017BMW535i GT——3.0LL6OE Fine Wire Double Platinum
2017BMW535i GT xDrive——3.0LL6OE Fine Wire Double Platinum
2017BMW640i——3.0LL6OE Fine Wire Double Platinum
2017BMW640i Gran Coupe——3.0LL6OE Fine Wire Double Platinum
2017BMW640i xDrive——3.0LL6OE Fine Wire Double Platinum
2017BMW640i xDrive Gran Coupe——3.0LL6OE Fine Wire Double Platinum
2017BMWX3——3.0LL6OE Fine Wire Double Platinum
2017BMWX5——3.0LL6OE Fine Wire Double Platinum
2017BMWX6——3.0LL6OE Fine Wire Double Platinum
2017Rolls-RoyceDawn——6.6LV12OE Fine Wire Double Platinum
2017Rolls-RoyceGhost——6.6LV12OE Fine Wire Double Platinum
2017Rolls-RoyceWraith——6.6LV12OE Fine Wire Double Platinum
2016BMW335i GT xDrive——3.0LL6OE Fine Wire Double Platinum
2016BMW435i——3.0LL6OE Fine Wire Double Platinum
2016BMW435i Gran Coupe——3.0LL6OE Fine Wire Double Platinum
2016BMW435i xDrive——3.0LL6OE Fine Wire Double Platinum
2016BMW435i xDrive Gran Coupe——3.0LL6OE Fine Wire Double Platinum
2016BMW535i——3.0LL6OE Fine Wire Double Platinum
2016BMW535i GT——3.0LL6OE Fine Wire Double Platinum
2016BMW535i GT xDrive——3.0LL6OE Fine Wire Double Platinum
2016BMW535i xDrive——3.0LL6OE Fine Wire Double Platinum
2016BMW640i——3.0LL6OE Fine Wire Double Platinum
2016BMW640i Gran Coupe——3.0LL6OE Fine Wire Double Platinum
2016BMW640i xDrive——3.0LL6OE Fine Wire Double Platinum
2016BMW640i xDrive Gran Coupe——3.0LL6OE Fine Wire Double Platinum
2016BMWActiveHybrid 5——3.0LL6OE Fine Wire Double Platinum
2016BMWM235i——3.0LL6OE Fine Wire Double Platinum
2016BMWM235i xDrive——3.0LL6OE Fine Wire Double Platinum
2016BMWX3——3.0LL6OE Fine Wire Double Platinum
2016BMWX4xDrive35i—3.0LL6OE Fine Wire Double Platinum
2016BMWX5——3.0LL6OE Fine Wire Double Platinum
2016BMWX6——3.0LL6OE Fine Wire Double Platinum
2016Rolls-RoyceDawn——6.6LV12OE Fine Wire Double Platinum
2016Rolls-RoyceGhost——6.6LV12OE Fine Wire Double Platinum
2016Rolls-RoyceWraith——6.6LV12OE Fine Wire Double Platinum
2015BMW335i——3.0LL6OE Fine Wire Double Platinum
2015BMW335i GT xDrive——3.0LL6OE Fine Wire Double Platinum
2015BMW335i xDrive——3.0LL6OE Fine Wire Double Platinum
2015BMW435i——3.0LL6OE Fine Wire Double Platinum
2015BMW435i Gran Coupe——3.0LL6OE Fine Wire Double Platinum
2015BMW435i xDrive——3.0LL6OE Fine Wire Double Platinum
2015BMW435i xDrive Gran Coupe——3.0LL6OE Fine Wire Double Platinum
2015BMW535i——3.0LL6OE Fine Wire Double Platinum
2015BMW535i GT——3.0LL6OE Fine Wire Double Platinum
2015BMW535i GT xDrive——3.0LL6OE Fine Wire Double Platinum
2015BMW535i xDrive——3.0LL6OE Fine Wire Double Platinum
2015BMW640i——3.0LL6OE Fine Wire Double Platinum
2015BMW640i Gran Coupe——3.0LL6OE Fine Wire Double Platinum
2015BMW640i xDrive——3.0LL6OE Fine Wire Double Platinum
2015BMW640i xDrive Gran Coupe——3.0LL6OE Fine Wire Double Platinum
2015BMW740i——3.0LL6OE Fine Wire Double Platinum
2015BMW740Li——3.0LL6OE Fine Wire Double Platinum
2015BMW740Li xDrive——3.0LL6OE Fine Wire Double Platinum
2015BMW760Li——6.0LV12OE Fine Wire Double Platinum
2015BMWActiveHybrid 3——3.0LL6OE Fine Wire Double Platinum
2015BMWActiveHybrid 5——3.0LL6OE Fine Wire Double Platinum
2015BMWActiveHybrid 7——3.0LL6OE Fine Wire Double Platinum
2015BMWM235i——3.0LL6OE Fine Wire Double Platinum
2015BMWM235i xDrive——3.0LL6OE Fine Wire Double Platinum
2015BMWX1——3.0LL6OE Fine Wire Double Platinum
2015BMWX3——3.0LL6OE Fine Wire Double Platinum
2015BMWX4——3.0LL6OE Fine Wire Double Platinum
2015BMWX5——3.0LL6OE Fine Wire Double Platinum
2015BMWX6——3.0LL6OE Fine Wire Double Platinum
2015Rolls-RoyceGhost——6.6LV12OE Fine Wire Double Platinum
2015Rolls-RoyceWraith——6.6LV12OE Fine Wire Double Platinum
2014BMW335i——3.0LL6OE Fine Wire Double Platinum
2014BMW335i GT xDrive——3.0LL6OE Fine Wire Double Platinum
2014BMW335i xDrive——3.0LL6OE Fine Wire Double Platinum
2014BMW435i——3.0LL6OE Fine Wire Double Platinum
2014BMW435i xDrive——3.0LL6OE Fine Wire Double Platinum
2014BMW535i——3.0LL6OE Fine Wire Double Platinum
2014BMW535i GT——3.0LL6OE Fine Wire Double Platinum
2014BMW535i GT xDrive——3.0LL6OE Fine Wire Double Platinum
2014BMW535i xDrive——3.0LL6OE Fine Wire Double Platinum
2014BMW640i——3.0LL6OE Fine Wire Double Platinum
2014BMW640i Gran Coupe——3.0LL6OE Fine Wire Double Platinum
2014BMW640i xDrive——3.0LL6OE Fine Wire Double Platinum
2014BMW640i xDrive Gran Coupe——3.0LL6OE Fine Wire Double Platinum
2014BMW740i——3.0LL6OE Fine Wire Double Platinum
2014BMW740Li——3.0LL6OE Fine Wire Double Platinum
2014BMW740Li xDrive——3.0LL6OE Fine Wire Double Platinum
2014BMW760Li——6.0LV12OE Fine Wire Double Platinum
2014BMWActiveHybrid 3——3.0LL6OE Fine Wire Double Platinum
2014BMWActiveHybrid 5——3.0LL6OE Fine Wire Double Platinum
2014BMWActiveHybrid 7——3.0LL6OE Fine Wire Double Platinum
2014BMWM235i——3.0LL6OE Fine Wire Double Platinum
2014BMWX1——3.0LL6OE Fine Wire Double Platinum
2014BMWX3——3.0LL6OE Fine Wire Double Platinum
2014BMWX5——3.0LL6OE Fine Wire Double Platinum
2014BMWX6——3.0LL6OE Fine Wire Double Platinum
2014Rolls-RoyceGhost——6.6LV12OE Fine Wire Double Platinum
2014Rolls-RoyceWraith——6.6LV12OE Fine Wire Double Platinum
2013BMW135i——3.0LL6OE Fine Wire Double Platinum
2013BMW135is——3.0LL6OE Fine Wire Double Platinum
2013BMW335i——3.0LL6OE Fine Wire Double Platinum
2013BMW335i xDrive——3.0LL6OE Fine Wire Double Platinum
2013BMW535i——3.0LL6OE Fine Wire Double Platinum
2013BMW535i GT——3.0LL6OE Fine Wire Double Platinum
2013BMW535i GT xDrive——3.0LL6OE Fine Wire Double Platinum
2013BMW535i xDrive——3.0LL6OE Fine Wire Double Platinum
2013BMW550i——4.4LV8OE Fine Wire Double Platinum
2013BMW550i xDrive——4.4LV8OE Fine Wire Double Platinum
2013BMW640i——3.0LL6OE Fine Wire Double Platinum
2013BMW640i Gran Coupe——3.0LL6OE Fine Wire Double Platinum
2013BMW740i——3.0LL6OE Fine Wire Double Platinum
2013BMW740Li——3.0LL6OE Fine Wire Double Platinum
2013BMW740Li xDrive——3.0LL6OE Fine Wire Double Platinum
2013BMW760Li——6.0LV12OE Fine Wire Double Platinum
2013BMWActiveHybrid 3——3.0LL6OE Fine Wire Double Platinum
2013BMWActiveHybrid 5——3.0LL6OE Fine Wire Double Platinum
2013BMWActiveHybrid 7——3.0LL6OE Fine Wire Double Platinum
2013BMWX1——3.0LL6OE Fine Wire Double Platinum
2013BMWX3——3.0LL6OE Fine Wire Double Platinum
2013BMWX5——3.0LL6OE Fine Wire Double Platinum
2013BMWX6——3.0LL6OE Fine Wire Double Platinum
2013Rolls-RoyceGhost——6.6LV12OE Fine Wire Double Platinum
2012BMW135i——3.0LL6OE Fine Wire Double Platinum
2012BMW335i——3.0LL6OE Fine Wire Double Platinum
2012BMW335i xDrive——3.0LL6OE Fine Wire Double Platinum
2012BMW535i——3.0LL6OE Fine Wire Double Platinum
2012BMW535i GT——3.0LL6OE Fine Wire Double Platinum
2012BMW535i GT xDrive——3.0LL6OE Fine Wire Double Platinum
2012BMW535i xDrive——3.0LL6OE Fine Wire Double Platinum
2012BMW550i——4.4LV8OE Fine Wire Double Platinum
2012BMW550i GT——4.4LV8OE Fine Wire Double Platinum
2012BMW550i GT xDrive——4.4LV8OE Fine Wire Double Platinum
2012BMW550i xDrive——4.4LV8OE Fine Wire Double Platinum
2012BMW640i——3.0LL6OE Fine Wire Double Platinum
2012BMW650i——4.4LV8OE Fine Wire Double Platinum
2012BMW650i xDrive——4.4LV8OE Fine Wire Double Platinum
2012BMW750i——4.4LV8OE Fine Wire Double Platinum
2012BMW750i xDrive——4.4LV8OE Fine Wire Double Platinum
2012BMW750Li——4.4LV8OE Fine Wire Double Platinum
2012BMW750Li xDrive——4.4LV8OE Fine Wire Double Platinum
2012BMW760Li——6.0LV12OE Fine Wire Double Platinum
2012BMWActiveHybrid 5——3.0LL6OE Fine Wire Double Platinum
2012BMWX3——3.0LL6OE Fine Wire Double Platinum
2012BMWX5——3.0LL6OE Fine Wire Double Platinum
2012BMWX6——3.0LL6OE Fine Wire Double Platinum
2012Rolls-RoyceGhost——6.6LV12OE Fine Wire Double Platinum
2011BMW135i——3.0LL6OE Fine Wire Double Platinum
2011BMW335i——3.0LL6OE Fine Wire Double Platinum
2011BMW335i xDrive——3.0LL6OE Fine Wire Double Platinum
2011BMW535i——3.0LL6OE Fine Wire Double Platinum
2011BMW535i GT——3.0LL6OE Fine Wire Double Platinum
2011BMW535i GT xDrive——3.0LL6OE Fine Wire Double Platinum
2011BMW535i xDrive——3.0LL6OE Fine Wire Double Platinum
2011BMW550i——4.4LV8OE Fine Wire Double Platinum
2011BMW550i GT——4.4LV8OE Fine Wire Double Platinum
2011BMW550i GT xDrive——4.4LV8OE Fine Wire Double Platinum
2011BMW550i xDrive——4.4LV8OE Fine Wire Double Platinum
2011BMW750i——4.4LV8OE Fine Wire Double Platinum
2011BMW750i xDrive——4.4LV8OE Fine Wire Double Platinum
2011BMW750Li——4.4LV8OE Fine Wire Double Platinum
2011BMW750Li xDrive——4.4LV8OE Fine Wire Double Platinum
2011BMW760Li——6.0LV12OE Fine Wire Double Platinum
2011BMWX3——3.0LL6OE Fine Wire Double Platinum
2011BMWX5——3.0LL6OE Fine Wire Double Platinum
2011BMWX6——3.0LL6OE Fine Wire Double Platinum
2011Rolls-RoyceGhost——6.6LV12OE Fine Wire Double Platinum
2010BMW535i GT——3.0LL6OE Fine Wire Double Platinum
2010BMW550i GT——4.4LV8OE Fine Wire Double Platinum
2010BMW550i GT xDrive——4.4LV8OE Fine Wire Double Platinum
2010BMW750i——4.4LV8OE Fine Wire Double Platinum
2010BMW750i xDrive——4.4LV8OE Fine Wire Double Platinum
2010BMW750Li——4.4LV8OE Fine Wire Double Platinum
2010BMW750Li xDrive——4.4LV8OE Fine Wire Double Platinum
2010BMW760Li——6.0LV12OE Fine Wire Double Platinum
2010BMWX5——4.4LV8OE Fine Wire Double Platinum
2010BMWX6——4.4LV8OE Fine Wire Double Platinum
2010Rolls-RoyceGhost——6.6LV12OE Fine Wire Double Platinum
2009BMW750i——4.4LV8OE Fine Wire Double Platinum
2009BMW750Li——4.4LV8OE Fine Wire Double Platinum
2009BMWX6——4.4LV8OE Fine Wire Double Platinum
2008BMWX6——4.4LV8OE Fine Wire Double Platinum