What does this BMW oil temp sensor adapter do?

The MMX BMW oil temp sensor adapter replaces the factory blanking plug on the oil cooler thermostat housing, adding a 1/8 NPT threaded port. This allows the installation of an aftermarket oil temperature sensor, oil pressure sensor, or dual-purpose sensor to feed live data to an aftermarket gauge or data logger — critical instrumentation for any tuned, high-power, or track-driven N54, N55, or S55 BMW.

What sensor thread size does this BMW oil temp sensor adapter use?

The adapter uses a standard 1/8 NPT port, which is the most common thread size for aftermarket oil temp and oil pressure sensors used by gauge manufacturers including Defi, AEM, Innovate, and most universal gauge kits. Most aftermarket sensors will fit directly.

Does this fit the S55-powered M3 and M4 as well as N54/N55 models?

Yes. The MMX BMW oil temp sensor adapter fits the oil cooler thermostat housing on the N54, N55, and S55 engines, covering the full range from 135i and 335i through to the F80 M3, F82 M4, M2 Competition, and M4 CS.

Will heat affect the adapter?

The adapter is machined from billet aluminum and will withstand normal engine temperatures without issue. However, prolonged exposure to excessive heat can affect the anodized finish — this is an inherent characteristic of anodized aluminum in high-heat locations and does not affect the function of the adapter.

How difficult is installation?

Level-1 install difficulty. The adapter threads directly into the oil cooler thermostat housing in place of the OEM plug. No special tools are required beyond basic hand tools and appropriate thread sealant on the sensor fitting.

Description

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Description

MMX Billet Oil Temp Sensor Adapter for BMW N54, N55, and S55 Engines

BMW oil temp sensor adapter from MMX Performance is a precision-machined billet aluminum fitting that replaces the factory plug on the oil cooler thermostat housing on N54, N55, and S55 engines, adding a 1/8 NPT port for the installation of aftermarket oil temperature or oil pressure sensors. On tuned, high-power, or track-driven BMWs, monitoring oil temperature and pressure is a critical safeguard. The factory instrumentation provides no live oil data, and knowing when oil temperatures are approaching dangerous levels or when oil pressure drops under sustained load can be the difference between catching a problem early and a catastrophic engine failure. The MMX adapter provides a clean, direct solution using the existing oil cooler thermostat housing location, eliminating the need for additional sandwich plates or remote fittings. Compact and low-profile, it installs in place of the OEM plug and is compatible with all standard 1/8 NPT sensor threads used by the major aftermarket gauge manufacturers.

Features

Precision-machined billet aluminum construction
Replaces factory plug on oil cooler thermostat housing
Adds 1/8 NPT port for aftermarket oil temp or oil pressure sensors
Compatible with all standard 1/8 NPT sensor threads
Compact, low-profile design for clean engine bay integration
Compatible with N54, N55, and S55 engines
Ideal for performance monitoring on tuned, high-power, or track vehicles

Applications

BMW 135i: E82, E88 | 2007-2013
BMW 1M Coupe: E82 | 2011
BMW 235i: F22, F23 | 2014-2016
BMW 335i: E90, E91, E92, E93 | 2006-2013
BMW 335is: E92, E93 | 2011-2013
BMW 435i: F32, F33, F36 | 2013-2016
BMW 535i: E60, E61, F07, F10, F11 | 2007-2017
BMW 640i: F06, F12, F13 | 2011-2018
BMW 740i: F01 | 2008-2015
BMW 740Li: F02 | 2008-2015
BMW ActiveHybrid 3: F30 | 2012-2015
BMW ActiveHybrid 5: F10 | 2011-2016
BMW M2 Competition: F87 | 2018-2021
BMW M2 CS: F87 | 2020
BMW M235i: F22, F23 | 2014-2016
BMW M3: F80 | 2014-2018
BMW M4: F82, F83 | 2014-2020
BMW M4 CS: F82 | 2017-2018
BMW M4 GTS: F82 | 2016
BMW X1 xDrive35i: E84 | 2012-2015
BMW X3 xDrive35i: F25 | 2011-2017
BMW X4 xDrive35i: F26 | 2014-2018
BMW X5 xDrive35i: F15 | 2013-2018
BMW X6 xDrive35i: E71, F16 | 2008-2019
BMW Z4 sDrive35i: E89 | 2009-2016
BMW Z4 sDrive35is: E89 | 2010-2016

Notes

Compatible with N54, N55, and S55 engines only.
Prolonged exposure to excessive heat may affect the anodized finish; this is unavoidable with anodized aluminum products in high-heat locations.
Sold as a single adapter fitting.

Frequently Asked Questions

What does this BMW oil temp sensor adapter do? The MMX BMW oil temp sensor adapter replaces the factory blanking plug on the oil cooler thermostat housing, adding a 1/8 NPT threaded port. This allows the installation of an aftermarket oil temperature sensor, oil pressure sensor, or dual-purpose sensor to feed live data to an aftermarket gauge or data logger — critical instrumentation for any tuned, high-power, or track-driven N54, N55, or S55 BMW.
What sensor thread size does this BMW oil temp sensor adapter use? The adapter uses a standard 1/8 NPT port, which is the most common thread size for aftermarket oil temp and oil pressure sensors used by gauge manufacturers including Defi, AEM, Innovate, and most universal gauge kits. Most aftermarket sensors will fit directly.
Does this fit the S55-powered M3 and M4 as well as N54/N55 models? Yes. The MMX BMW oil temp sensor adapter fits the oil cooler thermostat housing on the N54, N55, and S55 engines, covering the full range from 135i and 335i through to the F80 M3, F82 M4, M2 Competition, and M4 CS.
Will heat affect the adapter? The adapter is machined from billet aluminum and will withstand normal engine temperatures without issue. However, prolonged exposure to excessive heat can affect the anodized finish — this is an inherent characteristic of anodized aluminum in high-heat locations and does not affect the function of the adapter.
How difficult is installation? Level-1 install difficulty. The adapter threads directly into the oil cooler thermostat housing in place of the OEM plug. No special tools are required beyond basic hand tools and appropriate thread sealant on the sensor fitting.

About MMX Performance

MMX Performance is a UK-based specialist in performance parts for BMW and MINI vehicles, crafting high-quality upgrades that blend precision engineering, rigorous testing, and motorsport heritage. Driven by enthusiast culture, MMX designs its products in the UK and puts them through track validation to ensure durability, fitment accuracy, and on-road performance. Their catalog spans drivetrain components, spacers, hardware, and chassis enhancements, all tailored to elevate both the driving experience and visual appeal of BMW and MINI models.

Additional Information

The Bulletproof Automotive website contains many thousands of products purchased in multiple different currencies. All of the prices are entered manually and accurately at the time of entry. Due to the consistently fluctuating international exchange rates, at times prices may not be able to be honored at their original intended rate. We apologize for any inconvenience this may cause, unfortunately our website is unable to compensate dynamically for what can at times be volatile changes in the cost of items due to currency values fluctuating, changes in prices from suppliers, changes in shipping and import duties, and other factors. Rest assured that any order you place on line will be at zero risk to you in this area. If in the event your order cannot be fulfilled at the original intended website price we will offer you a 100% refund, no questions asked. We will continue to do our best to maintain updated prices and we will always continue to offer our price match guarantees as well to ensure our prices are always the best for you. In short, prices may change without notice. It is always advised to give us a call prior to placing your order online to confirm availability and to confirm current pricing.

Shipping Policy

Items that are in stock in the US, either at Bulletproof’s warehouse or at a supplier’s warehouse, are generally delivered within 7-10 days. Special order items from overseas take considerably longer. As a courtesy Bulletproof offers delivery estimates to our customers which take into consideration manufacturer availability and shipping schedule. These estimates represent our best guess based on previous orders from the manufacturer and do not in any way imply a guaranteed delivery window. Many manufacturers work in a “just in time” inventory system and often take 2-20+ weeks to produce an item once an order is submitted. All deliverable items are then sent to our Japanese warehouse. Bulletproof ships a minimum of one full ocean freight container every month from Japan, oftentimes more than one a month. Ocean freight takes an average of 4 weeks. Typically it breaks down to one week in Japan for paperwork and customs, two weeks by boat and one week in US customs/clearance. Due to the wide number of variables between manufacturer and shipping schedules, delivery estimates are simply just that – estimates. We attempt to estimate conservatively and we usually deliver faster than our estimates suggest. It is not Bulletproof’s policy to guarantee delivery time of any special order item, this is impossible for us to do. By ordering you acknowledge that there is no required delivery ETA and an order may not be canceled or altered due to manufacturing or shipping delays, all ETA’s are provided as a best guess only. Please review the full Terms & Conditions here.

BP Pricing Difference

We do pricing a little differently on our JDM brands and we believe in making things simple and clear. No hidden fees or surcharges. Every price you see includes the shipping cost to our office in Los Angeles, California and all the associated taxes/duties/fees for bringing the products into the US. The only shipping you ever pay is from our facility in the US to your location. Be wary of resellers that don’t include the cost of international shipping in their pricing on JDM parts. While we believe we’ll always have the lowest all-in price on JDM products, we offer a price match guarantee for all authentic parts purchased from authorized dealers as well. For many international customers, it’s much more affordable to ship from the USA than from Japan directly, as the air freight and ocean freight costs are typically much less. However, for customers looking to ship directly from Japan outside of North America, or domestically in Japan, we can provide pricing specifically for that scenario. Please do not hesitate to contact us with any pricing questions or concerns. Please email us at sales@bulletproofautomotive.com with any inquiries.

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MMX Billet Oil Temperature & Pressure Adapter Fitting for BMW Vehicles with N54 / N55 / S55 Engines [MMR03-0502-KP]

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MMX Billet Oil Temp Sensor Adapter for BMW N54, N55, and S55 Engines

Features

Applications

Notes

Frequently Asked Questions

About MMX Performance

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