Aftermarket Parts and Repair Solutions

For Automotive Powertrain Systems

Spare Parts

Our wide range of spare parts even includes parts that are not available individually from the dealer.

Repair Services

For some parts we offer rebuild services as a sustainable alternative.

Reverse Engineering

Often we have to design parts from scratch. New technologies, such as 3D scanning, support us here.

Support & Knowledge

Thanks to our years of experience, we are always by our customers' side with advice.

Our Mission

We live in a world where the economic goals of major automakers and suppliers often conflict with sustainable and affordable repair solutions. Many specific spare parts are not available individually, forcing car owners to replace more parts than necessary. We aim to offer our customers affordable and environmentally-friendly solutions for repairing their vehicles. In our opinion, unnecessary waste should be avoided when repairing cars. Why replace an entire hydraulic unit that consists of 10-20 different parts when you can replace individual components? With this approach, our customers not only save money but also help protect the environment.

In our portfolio, you can find new, used, or refurbished spare parts, as well as repair solutions. We specialize in electrohydraulic components, including:

  • Electric motors
  • Piston and membrane accumulators
  • Solenoid valves
  • Temperature and pressure sensors


Repair solutions

Years of experience

Orders completed

*as of 10/2023

Company history

In 2017, Ralf Stamnitz and his son Dominik Stamnitz founded Stamnitz & Sohn GbR. Their first product was the repair of a clutch slave cylinder for a BMW SMG transmission. Shortly thereafter, they expanded their product range to include spare parts for SMG transmissions.

To accommodate other sequential shift systems, they created their second online store, SequParts, at the beginning of 2018, offering parts for various transmissions, such as Ferrari F1 and Lamborghini E-Gear.

In January 2021, the newly established Stamnitz Automotive GmbH took over the operational business of both online stores. During the transition, they upgraded IT systems and business processes to process orders more efficiently and provide better customer service.

Since 2022, they have also expanded their product range to include parts for electronically or hydraulically controlled differentials, with plans to further expand this area in the coming years.


SMG Society

The SMG Society is a community dedicated to drivers of BMW's sequential transmissions, which were fitted to several models. We offer refurbished and new parts, as well as repair services.


SequParts offers parts for sequential transmissions that have been installed in models from over 20 different car manufacturers. In addition, the portfolio also includes parts for actively controlled differentials, suspension lift systems or cabrio roof actuation.


Below, you will find our contact information for business inquiries. Please be aware that we do not have a physical retail store on our premises. If you are a customer of one of our online stores, please use the contact form available on the respective website.


Griembergweg 30, 12305 Berlin, Germany


+49 15258117526


+49 30 70073512


Information according to ยง5 TMG

Stamnitz Automotive GmbH
Griembergweg 30
12305 Berlin

Trade register: HRB 224204
Register court: Amtsgericht Berlin (Charlottenburg)

Represented through:

Ralf Stamnitz
Dominik Stamnitz