BMW E90 E91 E92 LCi M57N2 Set Engine Oil Dipstick Guide Tube 7812257

BMW E90 E91 Dipstick Tube Oil Level Gauge Diesel M57N2 is an original part from the Oil Drain and Filler Plugs & Dipsticks category, designed for precise oil level control in diesel engines. The used, factory dipstick tube ensures proper guidance of the oil level gauge, facilitating safe operation of the power unit and reducing the risk of incorrect lubricant level readings.

Specifications and technical data

• SKU: 7812257
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7812257
• Substitutable numbers: 11437812257, 7812257, 11437793018, 7793018, 11437793017, 7793017
• Category: Oil Drain Plugs, Filler Caps & Dipsticks

Purpose and Function of the Oil Dipstick Tube

The dipstick tube in the M57N2 diesel engine is responsible for stable guidance of the dipstick and its sealed insertion into the oil pan. A correctly selected part:

• enables reliable reading of the working oil level,
• minimizes the risk of contamination in the engine bay,
• supports maintaining proper oil pressure and circulation in the lubrication system.

Thanks to the use of an original dipstick tube, the factory geometry for guiding the dipstick is maintained, which is important for regular maintenance and engine condition diagnostics.

Why Use an Original BMW Dipstick Tube

A part from the BMW OE line is designed for a specific type of power unit, maintaining appropriate dimensional tolerances and shape. In practice, this means:

• secure fit to the mounting points in the engine block and accessories,
• correct length and guidance of the oil level gauge,
• maintenance of the factory reference level for oil quantity checks.

For diesel engines like the M57N2, correct oil level control directly impacts the durability of the turbocharger, bearings, and other components of the crankshaft and piston system.

Condition, Origin, and Service Application

The dipstick tube is from a dismantled vehicle and is offered as a used part, allowing for economical repair while retaining a component with factory specifications. This type of part is particularly useful in situations where:

• the original tube has suffered mechanical damage (cracking, deformation),
• there are leaks around the oil level gauge guide,
• replacement is necessary as part of comprehensive lubrication system service.

Using an original dipstick tube is also beneficial for professional workshop repairs where assembly repeatability and compliance with service documentation are crucial.

Operation, Diagnostics, and Related Systems

Regular oil level checks using a functional dipstick tube and gauge allow for early detection of excessive oil consumption, leaks, or lubrication system problems. It is worth remembering that prolonged driving with an incorrect oil level can also affect the engine's operating temperature. More about the impact of auxiliary systems on engine lifespan can be found in the article: Engine Cooling System – Overheating, Repair, and Used Radiators.

Other BMW Oil Drain and Filler Plugs & Dipsticks

If you are also looking for other BMW Oil Drain and Filler Plugs & Dipsticks for your car, check out our dedicated offer: BMW Oil Drain and Filler Plugs & Dipsticks. This will allow you to easily select compatible lubrication system components within the same brand.