What problem does the BMW N55 baffled sump plate actually solve?

Under hard braking, cornering, or acceleration, oil in the sump surges away from the oil pickup. If the surge is severe enough, the pickup can momentarily run dry, starving the engine of oil pressure exactly when it is needed most under load. The BMW N55 baffled sump plate uses seven one-way flaps to trap oil around the pickup during surge events, maintaining consistent oil pressure and protecting the engine from starvation-related damage.

Does this require welding or sump removal to install?

No. Unlike welded baffle alternatives that require removing the sump for fabrication work, the BMW N55 baffled sump plate is a bolt-in design that installs without welding or permanent modification, making it significantly more accessible for owners doing the work themselves or through a standard workshop.

Why doesn't this fit xDrive N55 models?

The xDrive drivetrain layout uses a different sump and oil pan configuration to accommodate the front differential and transfer case routing beneath the engine. The BMW N55 baffled sump plate is engineered specifically for the RWD sump geometry and is not compatible with the xDrive sump shape.

Is this necessary on a road car, or only for track use?

The risk of oil starvation is highest under sustained high lateral and longitudinal loads, which are most common on track, but aggressive road driving and autocross events can trigger the same surge conditions. The BMW N55 baffled sump plate is most valuable for owners who drive their N55 hard in any setting, not exclusively dedicated track cars.

How do the one-way flaps work?

Each of the seven flaps allows oil to flow through freely under normal, low-load conditions. Under a sudden surge — such as oil rushing to one side of the sump during hard cornering — the flaps close in the direction of the surge, trapping oil around the pickup rather than letting it slosh away. This keeps the pickup submerged and maintains oil pressure throughout the maneuver.

Description

Additional Info

Shipping policy

BP PRICING DIFFERENCE

Reviews

Product Inquiry

Description

MMX Baffled Oil Sump Plate for BMW N55 Engines

BMW N55 baffled sump plate from MMX Performance is a purpose-built bolt-in upgrade designed to combat oil starvation under hard driving, particularly during aggressive braking and high lateral loads on track. Under those conditions, oil in the sump surges away from the pickup, and if the surge is severe enough, the pickup can momentarily run dry, starving the engine of oil pressure at exactly the moment it is needed most. The BMW N55 baffled sump plate solves this with an internal baffle system built around seven one-way oil control flaps: oil can pass through the flaps freely in normal conditions, but the flaps close under surge to trap oil around the pickup, maintaining consistent oil pressure through hard braking, cornering, and acceleration. Engineered from T-6061 anodized aluminum for strength and corrosion resistance, the plate is proven under both track and road conditions and significantly lowers the risk of oil starvation-related engine damage or failure under spirited use. Unlike welded baffle alternatives that require sump removal and fabrication work, this plate bolts directly into the existing sump with no welding or permanent modification required, making it an accessible upgrade for performance-focused N55 owners.

Features

Seven one-way oil control flaps for effective surge control
Maintains stable oil pressure during hard braking and cornering
Reduces risk of oil starvation and engine failure under extreme driving conditions
T-6061 anodized aluminum construction for strength and corrosion resistance
Proven performance under track and road conditions
Bolt-in installation; no welding or permanent modification required

Applications

BMW 135i: E82, E88 | 2010-2013
BMW 335i: E90, E91, E92, E93, F30, F31, F34 | 2010-2015
BMW 435i: F32, F33, F36 | 2013-2016
BMW 535i: F07, F10, F11 | 2010-2017
BMW 640i: F06, F12, F13 | 2011-2018
BMW 740i: F01, F02 | 2012-2015
BMW M135i: F20, F21 | 2012-2016
BMW M235i: F22, F23 | 2014-2016
BMW X5 sDrive35i: F15 | 2014-2018
BMW X6 sDrive35i: F16 | 2015-2019

Notes

Only compatible with N55 engine
Does not fit xDrive models

Frequently Asked Questions

What problem does the BMW N55 baffled sump plate actually solve? Under hard braking, cornering, or acceleration, oil in the sump surges away from the oil pickup. If the surge is severe enough, the pickup can momentarily run dry, starving the engine of oil pressure exactly when it is needed most under load. The BMW N55 baffled sump plate uses seven one-way flaps to trap oil around the pickup during surge events, maintaining consistent oil pressure and protecting the engine from starvation-related damage.
Does this require welding or sump removal to install? No. Unlike welded baffle alternatives that require removing the sump for fabrication work, the BMW N55 baffled sump plate is a bolt-in design that installs without welding or permanent modification, making it significantly more accessible for owners doing the work themselves or through a standard workshop.
Why doesn’t this fit xDrive N55 models? The xDrive drivetrain layout uses a different sump and oil pan configuration to accommodate the front differential and transfer case routing beneath the engine. The BMW N55 baffled sump plate is engineered specifically for the RWD sump geometry and is not compatible with the xDrive sump shape.
Is this necessary on a road car, or only for track use? The risk of oil starvation is highest under sustained high lateral and longitudinal loads, which are most common on track, but aggressive road driving and autocross events can trigger the same surge conditions. The BMW N55 baffled sump plate is most valuable for owners who drive their N55 hard in any setting, not exclusively dedicated track cars.
How do the one-way flaps work? Each of the seven flaps allows oil to flow through freely under normal, low-load conditions. Under a sudden surge — such as oil rushing to one side of the sump during hard cornering — the flaps close in the direction of the surge, trapping oil around the pickup rather than letting it slosh away. This keeps the pickup submerged and maintains oil pressure throughout the maneuver.

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.

Reviews

There are no reviews yet.

Only logged in customers who have purchased this product may leave a review.

Product Inquiry

First Name (*required)

Last Name (*required)

Your E-Mail (*required)

Telephone Number (*required)

Country (*required)

Vehicle Year / Make / Model (*required)

Please Explain What do you want to do with your vehicle

Additional Information (optional)

I agree to the terms & conditions and privacy policy and to have Bulletproof Automotive LLC contact me for promotion, marketing and other purposes via email, phone or SMS message.

MMX Baffled Oil Sump Plate for BMW Vehicles (with N55 engine) [MMR20-0501]

Guaranteed Safe Checkout

MMX Baffled Oil Sump Plate for BMW N55 Engines

Features

Applications

Notes

Frequently Asked Questions

About MMX Performance

Reviews