BMW N54 / N55 / S55 Engine Billet Aluminium Oil Thermostat Housing Cover & Plug Kit (Replaces 11617568552)

Replace your aged factory oil thermostat housing cover and plug with this premium billet aluminium upgrade, precision CNC-machined from aircraft-grade aluminium for permanent durability and a refined engine bay aesthetic. The factory oil thermostat housing cover and plug on N54, N55, and S55 engines are common engine bay components that suffer from aging, surface degradation, and seal failure over time — leaving the engine bay looking tired and creating potential oil leak points at high-mileage. This billet aluminium replacement kit permanently solves the durability problem while introducing a clean, motorsport-grade aesthetic to one of the most visible engine bay locations. Anodized finish maintains the premium appearance over long-term heat exposure, and CNC-machined precision ensures perfect OE-grade fitment for clean, professional installation.

Features:

• Higher quality construction – CNC machined from aircraft-grade billet aluminium for permanent durability and superior strength compared to factory components
• Anodized surface finish – delivers a premium appearance with rust resistance and superior corrosion protection over long-term engine bay heat exposure
• Precision engineering – manufactured using latest-generation CNC technology for high dimensional accuracy and perfect OE-grade fitment
• Unique design aesthetic – adds a clean, motorsport-inspired styling element to the engine compartment
• Direct OE replacement – installs into factory oil thermostat housing mounting points without modification
• Wide cross-platform compatibility – fits the entire N54, N55, and S55 BMW engine family across multiple chassis

Specifications:

• Condition: 100% Brand New
• Type: Oil Thermostat Housing Cover & Plug Kit
• Material: Billet Aluminium (Aircraft-Grade)
• Construction: CNC Machined
• Surface Finish: Anodized
• Quantity: Complete Cover & Plug Set
• Position: Oil Thermostat Housing
• Engine Compatibility: BMW N54, N55, and S55
• Purpose: Performance Replacement / Engine Bay Aesthetic Upgrade

OE / Replacement Part Numbers:

• 11 61 7 568 552 / 11617568552 (Plug)

Fitment:

Compatible with BMW N54, N55, and S55 engines only. Verify your engine code before ordering.

• BMW 1 Series:
• BMW E82 1 Series M Coupe (2011) – N54
• BMW E82 / E88 135i (2009 – 2013) – N54 / N55
• BMW E82 / E88 135is (2012 – 2013) – N55
• BMW F20 / F21 M135i (2012 – 2016) – N55
• BMW 2 Series:
• BMW F22 / F23 M235i (2013 – 2016) – N55
• BMW F87 M2 (2016 – 2018) – N55
• BMW F87 M2 Competition (2019 – 2021) – S55
• BMW 3 Series:
• BMW E90 / E91 / E92 / E93 335i (2009 – 2013) – N54 / N55
• BMW F30 / F31 / F34 335i (2011 – 2015) – N55
• BMW Alpina B3 E90 (2007 – 2010) – N54
• BMW F80 M3 (2014 – 2018) – S55
• BMW 4 Series:
• BMW F32 / F33 / F36 435i (2013 – 2016) – N55
• BMW F82 / F83 M4 (2014 – 2020) – S55
• BMW 5 Series:
• BMW E60 / E61 535i (2009 – 2010) – N54 / N55
• BMW F07 / F10 / F11 535i (2010 – 2017) – N55
• BMW 6 Series:
• BMW F06 / F12 / F13 640i (2011 – 2018) – N55
• BMW X1:
• BMW E84 X1 xDrive35i (2012 – 2015) – N55
• BMW X3:
• BMW F25 X3 xDrive35i (2010 – 2017) – N55
• BMW Z4:
• BMW E89 Z4 sDrive35i (2009 – 2016) – N54 / N55
• BMW E89 Z4 sDrive35is (2011 – 2016) – N54
• Compatible with N54, N55, and S55 engine variants only – not compatible with N20, N52, B58, S58, or other BMW engine families
• Confirm engine code is N54, N55, or S55 before ordering

Contents:

• 1x Billet Aluminium Oil Thermostat Housing Cover
• 1x Billet Aluminium Oil Thermostat Housing Plug

Sealing Ring Note:

The kit does not include a replacement sealing ring. Source a φ38 x φ2.5 O-ring separately for proper sealing during installation.

Benefits:

• Aircraft-grade billet aluminium construction permanently outlasts the factory thermostat housing components, eliminating recurring failure modes that can develop with aged factory parts
• Anodized finish maintains the premium aluminium appearance over long-term engine bay heat exposure without fading, corrosion, or surface degradation
• CNC-machined precision ensures OE-grade fitment for a clean, professional installation that maintains proper oil thermostat sealing
• Significant engine bay aesthetic upgrade – transforms a typically overlooked component into a clean, machined aluminium accent that elevates the overall engine bay appearance
• Wide cross-platform compatibility makes this a versatile upgrade for BMW enthusiasts who manage multiple N54/N55/S55-equipped vehicles or workshops servicing diverse BMW models
• Pairs naturally with other engine bay billet aluminium dress-up parts for a coordinated motorsport-grade engine bay aesthetic
• Direct OE replacement design enables straightforward installation without specialized tools or modifications

Installation Notes:

• Engine compatibility verification required: Confirm your engine code is N54, N55, or S55 before ordering – BMW uses different oil thermostat designs across other engine families
• Sealing ring not included: Source a φ38 x φ2.5 O-ring separately before installation – do not reuse the factory O-ring, as it may be hardened or compressed from previous service
• Allow the engine to fully cool before beginning service to avoid burns from hot engine components
• Drain or contain oil that may release during housing cover removal – have a clean catch container ready to prevent spillage
• Carefully remove the existing factory cover and plug – take note of original orientation and torque settings during removal
• Clean the mating surfaces thoroughly before installing the new aluminium components – any debris or old gasket material will compromise sealing
• Apply a small amount of clean engine oil to the new O-ring before installation to ensure smooth seating and prevent damage during fitment
• Tighten the new components to manufacturer-specified torque values – do not overtighten, as excessive torque can damage the aluminium threads or distort the O-ring seal
• Inspect for oil leaks at the housing after the engine reaches operating temperature
• Professional installation recommended if you are unfamiliar with engine oil system service procedures
• If unsure about compatibility with your specific BMW variant or engine code, contact our team with your year, model, and engine code (must be N54, N55, or S55) before ordering

Warranty:

• 12-month standard warranty from date of purchase
• Contact our support team for assistance with any issues