BMW E60 E90 E91 LCI F10 F20 F30 N57Z Sealing Cap Oil Filler Neck Engine 8655331

BMW E60 E90 E91 LCI F10 F20 F30 N57Z Sealing Cap Oil Filler Neck Engine is an original component from the Oil drain and filler caps and dipsticks group, designed for use in modern BMW diesel units. It ensures a tight seal of the oil filler opening in the front part of the engine bay, stabilizing the lubrication system operation and reducing the risk of leaks.

Specifications and technical data

• SKU: 8655331-1
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 8655331
• Substitutable numbers: 8655331, 11128655331, 4737102, 11124737102, 7560481, 11127560481, 8619360, 11128619360, 8507153, 11128507153, 7560482, 11127560482, 8619359, 11128619359
• Location on the vehicle: Front
• Category: Oil Drain Plugs, Filler Caps & Dipsticks

Purpose and function of the BMW oil filler cap

The presented cap is a factory solution used in popular BMW 3 and 5 series models, as well as selected compact versions with the N57Z engine. Its task is to maintain the proper tightness of the lubrication system, as well as to protect the interior of the engine from contaminants entering through the oil filler opening.

Its location in the front part of the vehicle facilitates maintenance – the cap is easily accessible during periodic oil changes, which speeds up operational tasks and reduces the risk of dirtying the engine bay.

Design and fitment for the N57Z unit

The design of the cap has been developed to work with the valve cover and lubrication system characteristic of N57Z engines. A properly selected sealing profile and precise fitment with the socket in the cover ensure stable mounting even at high operating temperatures and variable pressures in the engine compartment.

The original design dedicated to BMW reduces the risk of looseness, leaks, or assembly problems that often appear with universal aftermarket replacements. As a result, the cap works predictably and does not require additional modifications to adjacent components.

Benefits of using an original oil filler cap

Using the correct oil filler cap has a direct impact on the safety of the engine unit's operation. A tight seal of the filler opening reduces oil evaporation, minimizes the risk of leaks onto accessory components, and reduces the possibility of moisture and dust entering the engine.

• stable lubrication system tightness under typical operating loads,
• secure mounting in the valve cover socket,
• easy service access from the front of the vehicle,
• compatibility with the N57Z engine design in BMW E and F series models.

For the user, this means more predictable engine operation and a reduction in the risk of failure resulting from oil loss or contamination of its circuit.

Application in service practice

The cap will prove useful both for standard replacement of a worn component and during major service work within the engine bay. It is particularly useful in situations where the existing cap shows signs of wear, has a damaged sealing surface, or shows signs of leakage.

Replacing the cap is an uncomplicated task, and a correctly selected component allows for quickly restoring the proper tightness of the lubrication system without interfering with other sub-assemblies. This is a practical solution for workshops specializing in BMW maintenance and for users who independently take care of the technical condition of their car.

If you are planning a comprehensive repair or upgrade of the engine area in your BMW and need other components from the same group, such as oil drain plugs, additional filler caps, or dipsticks, check the available parts in the BMW oil drain and filler caps and dipsticks category.

Technical support and knowledge about the lubrication system

The proper operation of the oil filler cap is closely related to the condition of the entire lubrication system and the operating temperature of the engine unit. It is worth paying attention to the general condition of the engine, regularly checking the oil level, and reacting to any symptoms of overheating or excessive lubricant consumption.

To better understand the relationship between engine operating temperature, the cooling system, and lubrication, the guide article Engine cooling system – overheating, repair, and used radiators, which discusses the impact of proper cooling on engine longevity, may be helpful.