Stant 10258 Engine Coolant Reservoir Cap

OE Type Coolant Reservoir Cap for Closed Systems

The Stant OE Type Reservoir Cap 10258 is a 20 PSI engine coolant reservoir cap for threaded filler neck applications. It is made from durable plastic and is specified for closed cooling systems, making it a direct-fit service part for select Mercedes-Benz SUVs.

Key Features

• 20 PSI pressure rating for closed cooling systems
• OE Type Reservoir Cap for threaded filler neck designs
• Durable plastic construction
• Engine coolant reservoir cap for cooling system service
• Compatible with Mercedes-Benz ML320, ML430, ML500, ML55 AMG, and ML350 applications

Product Details

Stant 10258 is built as an OE Type Reservoir Cap for vehicles that use a threaded coolant reservoir filler neck. The 20 psi pressure rating helps maintain the cooling system’s operating pressure, which is important for proper coolant performance in closed systems. This part number is a practical replacement choice for Mercedes-Benz ML320, ML430, ML500, ML55 AMG, and ML350 models within the listed years.

The Stant OE Type Reservoir Cap product line focuses on replacement caps that match original-style fitment and pressure requirements. If you are searching for a Mercedes-Benz ML350 coolant reservoir cap, a Mercedes-Benz ML500 reservoir cap, or Stant 10258 for a closed cooling system, this part matches the specified application details.

Vehicle Fitment

• Fits 2003-2005 Mercedes-Benz ML350, N/A; Pressure Rating 20 psi; OE Type Reservoir Cap
• Fits 2002-2005 Mercedes-Benz ML500, N/A; Pressure Rating 20 psi; OE Type Reservoir Cap
• Fits 1998-2003 Mercedes-Benz ML320, N/A; Pressure Rating 20 psi; OE Type Reservoir Cap
• Fits 2000-2003 Mercedes-Benz ML55 AMG, N/A; Pressure Rating 20 psi; OE Type Reservoir Cap
• Fits 1999-2001 Mercedes-Benz ML430, N/A; Pressure Rating 20 psi; OE Type Reservoir Cap

Common Issues This Part Addresses

• Loss of cooling system pressure from a worn reservoir cap
• Coolant seepage at the threaded filler neck
• Improper cap sealing on a closed cooling system
• Pressure-related cooling system performance concerns
• Replacement needs for aging Mercedes-Benz coolant reservoir caps

Installation Notes and Tips

Confirm the reservoir uses a threaded filler neck and verify the 20 PSI pressure specification before installation. Inspect the sealing surface and neck threads for damage, contamination, or coolant residue before installing the new cap. Always allow the engine to cool completely before servicing the cooling system.

Quality Assurance

Stant manufactures cooling system service parts with OE-style fitment and specified pressure ratings for direct replacement use. Part number 10258 is built to the listed application requirements for the vehicles shown above.