BMW E60 M5 E63 M6 S85 E90 E92 M3 S65 Engine Connecting Rod Piston Conrod

BMW E60 M5 E63 M6 S85 E90 E92 M3 S65 Engine Connecting Rod Piston Conrod is an original component from the Pistons and rings group, designed for advanced BMW E-series engines and M models. This used OEM component ensures factory geometry, proper cylinder fitment, and engine performance parameters consistent with the manufacturer's specifications.

Specifications and technical data

• SKU: 7840922
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7840922
• Substitutable numbers: 11257840922, 7840922, 11257835400, 7835400, 11247838623, 7838623, 11247836113, 7836113
• Category: Pistons & Rings

Purpose and technical characteristics

The piston is dedicated to engines installed in BMW E60, E63, E90, E92 models and the sports M3, M5, and M6 versions. The original design ensures the correct crown shape, guidance within the cylinder liner, and compatibility with the factory crankshaft and piston assembly. This maintains proper compression, combustion control, and stable engine operation across the full load range.

The component comes from the BMW OE line, which means it complies with factory dimensional, material, and technological tolerances. This is crucial for repairs of high-revving and heavily loaded engines, where precision of workmanship has a direct impact on durability and engine refinement.

Benefits of using an original BMW piston

Using an original piston in a BMW engine allows for maintaining engine performance parameters close to factory standards. In practice, this means:

• proper sealing of the combustion chamber and maintenance of correct compression pressure,
• stable operation at high RPMs characteristic of M versions,
• proper cooperation with piston rings and the piston pin,
• reduced risk of excessive cylinder wear and increased oil consumption.

A used, original component is often a reasonable choice for engine overhauls where compliance with factory specifications is key, while also optimizing repair costs. Original origin helps avoid problems typical of aftermarket replacements of uncertain quality.

Condition, verification, and fitment

The product is offered as a used part, which in practice means it has been removed from a vehicle and verified for suitability for further use. This type of piston is intended for installation in engines where repair or partial rebuilding of the crankshaft and piston assembly is planned, while maintaining BMW's original design solutions.

Before purchasing, it is recommended to compare the engine parameters and vehicle catalog data to ensure full compatibility with the specific engine version. This ensures the piston will work correctly with existing components such as the connecting rod, pin, and rings.

Application in service and M-series tuning

Due to its purpose, the piston is used both in standard service repairs and in projects where maintaining the original specification of M3, M5, or M6 units is important. Choosing an original component allows for preserving the engine's operating characteristics, throttle response, and predictable behavior during dynamic driving.

In the case of more extensive overhauls involving several cylinders, using pistons from the same design group facilitates maintaining uniform mechanical and thermal loads, which translates into a longer engine service life.

Related items from the BMW Pistons and rings group

If you are planning a comprehensive repair or upgrade of your BMW engine area and need other elements from the same group, such as additional pistons, piston rings, or related sealing components, check the available parts in the BMW Pistons and rings category.

More information on choosing used parts

If you want to better understand how to safely select used engine components and other parts for popular car models, it is worth reading the practical tips contained in the article The best used car parts – a guide to the most frequently chosen original parts. This will make it easier for you to assess when choosing an original, used part is technically justified and economically beneficial.