BMW M3 E9X Rod Bearings

The BMW S65 engine, which is renowned for its high-performance capabilities, has unfortunately been associated with a specific mechanical concern known as the rod bearing issue. This problem primarily affects the connecting rod bearings within the engine, components crucial for the smooth and efficient operation of the motor.

Rod bearings play a vital role in maintaining the proper alignment and movement of the engine's connecting rods. In the case of the S65 motor, the rod bearing problem has been identified as premature wear and deterioration of these bearings. This wear can result in increased friction, decreased lubrication efficiency, and potential metal-to-metal contact between the bearing and the crankshaft. Over time, if left unaddressed, this condition can lead to severe engine damage, including catastrophic failure.

The rod bearing issue has garnered attention within the BMW enthusiast and automotive communities, particularly among owners of models equipped with the S65 engine, such as the E90/E92 M3. As a response to these concerns, BMW has issued technical service bulletins and recalls to address the problem, emphasizing the importance of regular maintenance and oil changes to mitigate the risk of premature rod bearing wear.

Enthusiasts and owners often opt for preventive measures, such as aftermarket rod bearing replacements with improved materials and designs, to enhance the engine's longevity and reliability we recommend ACL Bearings & ARP Con-rod Bolts. Additionally, maintaining a vigilant approach to monitoring oil quality and adhering to recommended service intervals are essential practices for mitigating the rod bearing issue's impact on the BMW S65 motor.

Symptoms

It is important to be aware of the signs that your engine rod bearings may be starting to wear or on their way out. It is common that your car will display some or all of these signs.

Knocking noise: you may notice a knocking noise when you start your car. This is a good sign your rod bearings may need replacing.

Low oil pressure: You may notice decreased oil pressure when starting your car. Your “check engine oil” light will come on. Do not ignore this even if it only stays on for a few moments after first starting your car.