Audi R8 Genuine OEM Coolant Expansion Tank Cap – 420121321

Replace your worn or damaged coolant reservoir cap with this Genuine OEM Audi Coolant Expansion Tank Cap 420121321. Designed for selected Audi R8 models, this factory coolant cap maintains the correct pressure within the cooling system, helping to ensure efficient engine cooling while preventing coolant leaks and premature coolant loss.

Manufactured to Audi's strict OEM standards, this genuine expansion tank cap provides an exact fit and reliable sealing performance. A properly functioning coolant cap is essential for maintaining the correct operating pressure, reducing the risk of overheating, and ensuring the cooling system operates as designed.

Key Features

• Genuine OEM Audi coolant expansion tank cap.
• OEM Part Number: 420121321.
• Designed for selected Audi R8 models.
• Maintains correct cooling system pressure.
• Factory-quality pressure relief valve.
• Direct OEM replacement.
• High-quality durable construction.
• Manufactured to Audi factory specifications.

Benefits

• Helps prevent coolant leaks and pressure loss.
• Maintains proper cooling system operation.
• Supports stable engine operating temperatures.
• Perfect OEM fit and sealing performance.
• Reliable long-term durability.
• Simple preventative maintenance replacement.

Vehicle Compatibility

• Audi R8 (selected models).
• Compatible with vehicles using OEM part number 420121321.

Please verify compatibility using your VIN number or existing part number before ordering. Fitment may vary depending on model year and cooling system configuration.

Installation Information

• Install only when the engine is completely cool.
• Direct replacement for the original coolant cap.
• Inspect the coolant reservoir for damage before installation.
• Check coolant level after installation.
• Never remove the coolant cap while the engine is hot.

Why Choose Genuine Audi Cooling System Components?

Genuine Audi cooling system components are manufactured to strict OEM standards, ensuring reliable sealing, correct pressure regulation and long service life. Unlike many aftermarket alternatives, OEM coolant caps maintain factory cooling system performance, helping to protect your engine from overheating and coolant pressure issues.