Why upgrade the BMW N54 N55 oil thermostat to a low-temp unit?

The factory BMW N54 N55 oil thermostat opens at 110°C, meaning oil is already at elevated temperature before it begins circulating through the cooler. The MMX low-temp unit opens earlier, initiating oil flow sooner and stabilizing temperatures between 90°C and 110°C — the optimal range for engine lubrication and protection under hard driving or high-power conditions.

Is this a bypass or a true thermostat replacement?

This is a true thermostat replacement, not a bypass. Unlike bypass kits that force continuous oil flow regardless of temperature, the MMX unit functions as a properly calibrated valve — it stays closed during warm-up to allow the engine to reach operating temperature normally, then opens to regulate flow once the target temperature is reached.

Do I need a full oil cooler if I fit this BMW N54 N55 oil thermostat?

For most street-driven and moderately tuned N54 and N55 cars, the low-temp thermostat alone is sufficient to bring oil temperatures into the optimal range. For heavily modified builds or sustained track use where heat generation is significantly above standard, an oil cooler system may also be needed; but the thermostat is the recommended first step and is significantly more affordable.

Does this fit both the N54 and N55 engine?

Yes. The MMX low-temp oil thermostat fits both the N54 3.0L twin-turbo and N55 3.0L single-turbo engines. It is compatible with models from 2008 onwards — it does not fit 2007 N54 models due to differences in the oil thermostat housing.

How difficult is installation?

Installation is Level-2 difficulty and involves accessing the oil thermostat housing on the front of the engine. The thermostat drops directly into the OE housing with no cutting or permanent modification required. Professional installation is recommended to avoid oil contamination during the swap.

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Description

MMX Low-Temp Oil Thermostat for BMW N54 and N55 Engines

BMW N54 N55 oil thermostat from MMX Performance is a precision-machined low-temperature replacement for the factory oil thermostat on N54 and N55 engines, designed to bring oil temperatures into the optimal 90°C to 110°C range faster and hold them there more consistently under hard driving conditions. The factory thermostat opens at 110°C, meaning oil is already at elevated temperature before it begins flowing through the cooler; the MMX low-temp unit opens earlier, initiating oil circulation sooner and preventing the temperature spikes that reduce lubrication efficiency and accelerate wear on high-power or track-driven cars. Machined from aircraft-grade T-6061 aluminum and finished in MMX’s proprietary anodized coating, it drops directly into the OE oil thermostat housing with no cutting or permanent modification, making it one of the most cost-effective thermal management upgrades available before committing to a full oil cooler system. Compatible with N54 and N55 engines from 2008 onwards.

Features

Low-temp unit opens earlier than factory to initiate oil flow at cooler temperatures
Maintains oil temperatures between 90°C and 110°C
Machined from aircraft-grade T-6061 aluminum
Finished in MMX’s proprietary anodized coating for long-term durability
Direct fit into the OE oil thermostat housing on N54 and N55 engines
No cutting or permanent modification required
Cost-effective alternative to a full oil cooler system
Suitable for high-power builds and track applications

Applications

BMW 135i: E82, E88 | 2007-2013
BMW 135is: E82, E88 | 2013
BMW 1M Coupe: E82 | 2011-2013
BMW 335i: E90, E91, E92, E93, F30, F31, F34 | 2006-2015
BMW 335is: E92, E93 | 2011-2013
BMW 435i: F32, F33, F36 | 2013-2016
BMW 535i: E60, E61, F07, F10, F11, F18 | 2007-2016
BMW 640i: F06, F12, F13 | 2011-2018
BMW 740i: F01, F02 | 2009-2015
BMW ActiveHybrid 3: F30 | 2012-2015
BMW ActiveHybrid 5: F10 | 2011-2016
BMW ActiveHybrid 7: F04 | 2012-2015
BMW M135i: F20, F21 | 2012-2016
BMW M2: F87 | 2016-2018
BMW M235i: F22, F23 | 2014-2016
BMW X1 xDrive35i: E84 | 2012-2015
BMW X3 xDrive35i: F25 | 2011-2017
BMW X4 xDrive35i: F26 | 2014-2016
BMW X5 sDrive35i: E70, F15 | 2010-2018
BMW X5 xDrive35i: E70, F15 | 2010-2018
BMW X6 xDrive35i: E71, F16 | 2008-2019
BMW Z4 sDrive35i: E89 | 2009-2016
BMW Z4 sDrive35is: E89 | 2011-2016

Notes

Compatible with N54 and N55 engines from 2008 onwards only. Does not fit 2007 N54 models.
Verify your engine code (N54 or N55) before purchasing
Sold as a single thermostat unit

Frequently Asked Questions

Why upgrade the BMW N54 N55 oil thermostat to a low-temp unit? The factory BMW N54 N55 oil thermostat opens at 110°C, meaning oil is already at elevated temperature before it begins circulating through the cooler. The MMX low-temp unit opens earlier, initiating oil flow sooner and stabilizing temperatures between 90°C and 110°C the optimal range for engine lubrication and protection under hard driving or high-power conditions.
Is this a bypass or a true thermostat replacement? This is a true thermostat replacement, not a bypass. Unlike bypass kits that force continuous oil flow regardless of temperature, the MMX unit functions as a properly calibrated valve it stays closed during warm-up to allow the engine to reach operating temperature normally, then opens to regulate flow once the target temperature is reached.
Do I need a full oil cooler if I fit this BMW N54 N55 oil thermostat? For most street-driven and moderately tuned N54 and N55 cars, the low-temp thermostat alone is sufficient to bring oil temperatures into the optimal range. For heavily modified builds or sustained track use where heat generation is significantly above standard, an oil cooler system may also be needed; but the thermostat is the recommended first step and is significantly more affordable.
Does this fit both the N54 and N55 engine? Yes. The MMX low-temp oil thermostat fits both the N54 3.0L twin-turbo and N55 3.0L single-turbo engines. It is compatible with models from 2008 onwards it does not fit 2007 N54 models due to differences in the oil thermostat housing.
How difficult is installation? Installation is Level-2 difficulty and involves accessing the oil thermostat housing on the front of the engine. The thermostat drops directly into the OE housing with no cutting or permanent modification required. Professional installation is recommended to avoid oil contamination during the swap.

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 Low-Temp Oil Thermostat for BMW Vehicles with N54 / N55 Engine [MMR17-0101]

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MMX Low-Temp Oil Thermostat for BMW N54 and N55 Engines

Features

Applications

Notes

Frequently Asked Questions

About MMX Performance

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