NGK 91874 Laser Iridium Spark Plug for 2011-2021 BMW 550i 4.4L V8

Vehicle Fitment

• 2011-2016 BMW 550i (F10), 4.4L TwinPower Turbo V8, RWD
• 2011-2016 BMW 550i xDrive (F10), 4.4L TwinPower Turbo V8, AWD
• 2012-2018 BMW 650i Coupe/Convertible/Gran Coupe (F12/F13/F06), 4.4L TwinPower Turbo V8, RWD
• 2012-2018 BMW 650i xDrive Coupe/Gran Coupe (F12/F13/F06), 4.4L TwinPower Turbo V8, AWD
• 2013-2015 BMW 750i (F01/F02), 4.4L TwinPower Turbo V8, RWD
• 2013-2015 BMW 750i xDrive (F01/F02), 4.4L TwinPower Turbo V8, AWD
• 2013-2015 BMW 750Li (F02), 4.4L TwinPower Turbo V8, RWD
• 2013-2015 BMW 750Li xDrive (F02), 4.4L TwinPower Turbo V8, AWD
• 2014-2018 BMW X5 xDrive50i (F15), 4.4L TwinPower Turbo V8, AWD
• 2015-2019 BMW X6 xDrive50i (F16), 4.4L TwinPower Turbo V8, AWD
• 2011-2020 Rolls-Royce Ghost, 6.6L Twin-Turbo V12, RWD

Fitment Notes

• NGK OE Laser Iridium spark plug for compatible BMW and Rolls-Royce applications.
• Fits only engines requiring NGK SIZKBR8B8HG (Stock No. 91874).
• Sold individually; most engines require multiple spark plugs.
• Verify OE part number before ordering for model-year production changes.

Features

• NGK Laser Iridium OE replacement spark plug.
• Fine-wire iridium center electrode improves ignition efficiency.
• Laser-welded platinum ground electrode extends service life.
• Copper core enhances heat dissipation.
• High-strength alumina ceramic insulator resists flashover.
• Integrated 5 kΩ resistor suppresses ignition interference.
• Pre-gapped to manufacturer specification where applicable.
• Designed to maintain OE performance, fuel economy, and smooth operation.

Specifications

• Manufacturer: NGK
• Part Number: 91874
• Plug Type: SIZKBR8B8HG
• Series: Laser Iridium
• Thread Size: M12 x 1.25
• Reach: 26.5 mm
• Hex Size: 14 mm Bi-Hex
• Seat Type: Gasket
• Heat Range: NGK 8
• Factory Gap: 0.8 mm (0.032 in.)
• Resistor: Yes (5 kΩ)
• Position: Engine Spark Plug

Included Components

• 1x NGK 91874 Laser Iridium Spark Plug

Product Description

The NGK 91874 Laser Iridium Spark Plug (SIZKBR8B8HG) is an OE-quality replacement engineered for select BMW and Rolls-Royce turbocharged engines. Featuring a fine-wire iridium center electrode and a laser-welded platinum ground electrode, it delivers reliable ignition performance, improved combustion efficiency, and exceptional durability under high-performance operating conditions.

Built to meet original equipment specifications, this spark plug helps maintain smooth engine operation, consistent power delivery, and long service intervals. Its copper-core construction and premium ceramic insulator provide efficient heat transfer and dependable electrical insulation, making it an ideal replacement during scheduled ignition system maintenance.