BMW
Genuine BMW 12122455258 B58 TU High Power Stage 1/2 Spark Plug (Inc. M240i, M340i & X5 40i)
Genuine BMW 12122455258 B58 TU High Power Stage 1/2 Spark Plug (Inc. M240i, M340i & X5 40i)
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The RM Series is comprised of a damper cartridge secured within a threaded outer body. This specific design requires a lubricating grease to be applied during the assembly process between the two damper and threaded body to avoid metal-to-metal contact. In order to keep the two components from touching each other and generating noise transmission you will need to periodically clean out the old grease and apply new grease.
This is a simple process that can be done with just a few common tools. It does not require you to open the internals of the dampers themselves and therefore you do not need to have the dampers re-pressurized after carrying out this procedure. Please contact us on info@mlperformance.co.uk for more information and a step-by-step guide on how to complete this maintenance.
As a result of this required maintenance, we do not recommend the RM Series for road use over the BR Series or ER Series.
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Fitting service at Xatrix, West Yorkshire
We can offer a fitting service for this part. Contact us for a fitting quote.
This is a genuine BMW replacement sparkplug for the B58 Engines, no gaping adjustment is needed when using it as a replacement plug.
Everyone knows spark plug changes are suggested every 20k miles or so for tuned vehicles and require replacement or regapping for higher than stock power levels. We offer an easy to use Masata Universal Spark Plug Gapping Tool Kit. The gapping tool lets you quickly set the gap without risk of damaging the plug.
PLEASE NOTE:
For Gen.2 B58 engines as found in the G20 M340i, 540i and X3M.
* This High Power TU Spark Plug can also be used on Gen. 1 B58 engine found on M140i, M240i, 340i & 440i. It is the recommended plug for those with a stage 2 tune or a upgraded turbo setup.
Note: The listing is for a single plug, you will generally need six when replacing your plugs.
Everyone knows spark plug changes are suggested every 20k miles or so for tuned vehicles and require replacement or regapping for higher than stock power levels. We offer an easy to use Masata Universal Spark Plug Gapping Tool Kit. The gapping tool lets you quickly set the gap without risk of damaging the plug.
- 2' F45 Active Tourer LCI 216i/218i/220i/225ix (05/2017 — 03/2019)
- 2' F46 Gran Tourer 218i (10/2016 — 02/2018)
- 2' F46 Gran Tourer LCI 216i/218i/220i (05/2017 — 03/2019)
- 3' G20 320i/330i/330ix/M340i/M340ix (10/2017 — 03/2019)
- 5' G30 520i/530i/530ix (09/2017 — 03/2019)
- 5' G31 520i/530i/530ix (09/2017 — 03/2019)
- 6' G32 GT 630i (09/2017 — 03/2019)
- 7' G11 LCI 730i/740i/745e (01/2018 — 03/2019)
- 7' G12 LCI 730Li/740i/740iX/740Li/740LiX/745eX/745Le/745LeX (01/2018 — 03/2019)
- i8 I12 (02/2013 — 02/2018)
- i8 I12 LCI (11/2016 — 03/2019)
- i8 I15 (01/2017 — 03/2019)
- X1 F48 X1 18i/X1 20i/X1 20iX/X1 25iX (10/2016 — 03/2019)
- X2 F39 X2 18i/X2 20i/X2 20iX (10/2016 — 03/2019)
- X5 G05 X5 40iX (10/2017 — 03/2019)
- X7 G07 X7 40iX (11/2017 — 03/2019)
- Z4 G29 Z4 20i/Z4 30i/Z4 M40i (10/2017 — 03/2019)
- MINI F56 (11/2016 — 03/2019)
- MINI F55 (11/2016 — 03/2019)
- MINI Clubman F54 (09/2017 — 03/2019)
- MINI Cabrio F57 (12/2016 — 03/2019)
- MINI Countryman F60 (10/2017 — 03/2019)
Also Fits Toyota Supra A90
To ensure the part(s) you have ordered fits your vehicle, we run a compatibility check prior to dispatch. We can do this either using your registration number(UK) or the last 7 digits of your VIN. Simply enter your car details prior to checkout.
12122455258
Manufactured by
BMW
Warranty
Two years manufacturer warranty for UK customers and one year manufacturer warranty for international customers if VIN is provided during check out on compatible vehicles.

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