MMX Performance Baffled Oil Sump Insert / Oil Pan Baffle

Anti Surge Sump Gate Insert for BMW N55 – Track Proven Lubrication Control

Protect your BMW turbo straight-six under hard driving with this MMX Performance sump gate system. Designed for the N55 engine, it keeps lubricant concentrated around the pick-up during high G cornering, heavy braking and rapid acceleration, helping maintain steady oil pressure on circuit and fast road use.

This drop-in, no-weld trap-door insert is a smart reliability upgrade for tuned and spiritedly driven cars. By limiting oil slosh and reducing aeration, it improves pressure stability and supports engine longevity when you are pushing on.

Why it belongs on your N55

• T-6061 anodised aluminium construction for strength, thermal stability and corrosion resistance
• Seven one-way gates and internal partitions to keep lubricant around the pick-up where it is needed most
• Cuts surge and foam formation under sustained lateral load, aiding consistent pressure delivery
• Direct-fit, bolt-in solution that avoids welding and is far easier to install than plate-and-weld alternatives
• Proven on road and track over thousands of miles with logged results showing clear improvements in pressure consistency
• Ideal for track days, fast road, mapped N55 builds and anyone who drives their BMW enthusiastically

Real-world feedback

At MJ Modifications we rate this upgrade highly. We have installed this kit on our own N55 projects and many customer cars, and feedback has been excellent for peace of mind and pressure stability during hard use.

Vehicle compatibility

• BMW F20 F21 M135i – N55
• BMW F22 F23 M235i – N55
• BMW F30 F31 335i – N55
• BMW F32 F33 F36 435i – N55
• Rear wheel drive models only. Not suitable for xDrive or all-wheel drive versions

What you gain

• Enhanced oil control during cornering, braking and acceleration
• Improved protection for bearings and turbocharger thanks to steadier pressure
• Confidence to drive harder on track days and B-roads

Installation

Professional fitting recommended. MJ Modifications can supply and fit at our Warwickshire workshop. For pricing and booking, email info@mjmodifications.co.uk.

Notes

Typical warm idle oil pressure is approximately 1.5 bar for reference.

Helpful search terms

BMW N55 sump gate insert, N55 anti surge kit, BMW M135i lubrication control, M235i trap door sump, 335i oil control plate, 435i gated sump insert, N55 pick-up protection, BMW F-series track upgrade, rear drive oil surge solution, straight-six oil management, circuit driving oil control, high G oil pick-up retention, bolt-in sump gate for N55, tuned N55 reliability upgrade, BMW 1 Series 2 Series 3 Series 4 Series N55 oil control.