What is the main benefit of the OS Giken Super Lock LSD over a standard differential?

The Super Lock LSD provides up to 100% lockup under acceleration, meaning both rear wheels receive power simultaneously. This significantly improves traction, especially when exiting corners or on uneven surfaces, and reduces wheelspin compared to a standard open differential.

Does this LSD come as a complete unit, or is it a rebuild kit?

This is a complete Super Lock Limited Slip Differential assembly from OS Giken. It is designed to be a direct replacement for your vehicle's factory differential, not a kit to modify your existing one.

What type of driving is this LSD best suited for?

While engineered for smooth daily driving, the Super Lock LSD truly shines during spirited driving, track days, or aggressive canyon carving. Its ability to provide maximum traction when needed makes it a popular choice for performance-oriented drivers.

2008-2013 BMW 128i LSD | OS Giken BM531-HA

Name: OS Giken BMW E87 135i (MT Only) / E92 335i (AT Only) Super Lock LSD
Brand: OS Giken
SKU: os-giken-os-giken-bmw-e87-135i-mt-only-e92-335i-at-only-super-lock-lsd-t14-4332011
Price: 1989.12 USD
Availability: InStock

OS Giken BMW E87 135i (MT Only) / E92 335i (AT Only) Super Lock LSD

$1989.12

Only 1 left in stock

OS Giken BMW 128i Super Lock LSD. This limited-slip differential offers improved traction and handling for your 2008-2013 128i.

Key Features

Fits 2008-2013 BMW 128i.
Includes the OS Giken Super Lock Limited Slip Differential assembly.
Features a mechanism that locks up to 100% under acceleration for maximum traction.
Designed for smooth engagement, reducing grabby behavior during daily driving.
Well-built internal components handle the stresses of spirited driving.
Direct fit replacement for the factory differential on the specified BMW models.

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Product Details

What you get with this OS Giken Super Lock Limited Slip Differential (LSD) is a complete unit designed to replace your factory open differential. This isn't just a clutch pack upgrade; it's a full differential assembly that includes OS Giken's advanced Super Lock mechanism. This unit is specifically built for the 2008-2013 BMW 128i, offering a significant improvement in how your car puts power down, especially when accelerating out of corners or on slippery surfaces.

The Super Lock design is notable for its ability to lock up to 100% under acceleration, providing maximum traction when you need it most. Unlike some other LSDs that can be grabby or unpredictable in daily driving, the OS Giken unit is engineered for smooth engagement. This means you get the benefits of an LSD – improved cornering grip and reduced wheelspin – without sacrificing daily drivability. The internal components are well-built to handle the stresses of spirited driving, ensuring consistent performance over time. This specific part number, BM531-HA, is tailored for the 128i, ensuring a direct fit for your vehicle's drivetrain.

When installing this LSD, remember that it's a comprehensive replacement for your existing differential. You'll want to ensure you have the proper fluids and potentially new seals, as recommended by OS Giken's installation instructions. This upgrade is a substantial change for your BMW's handling characteristics, making it a popular choice for drivers looking to enhance their car's performance and control, especially for track days or aggressive canyon carving.