Genuine BMW 540i Coolant Reservoir Cap

Coolant Overflow Reservoir Cap

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6 Coolant Reservoir Caps found

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BMW 540i Radiator Cap
Part Number: 17117639020
$23.00 MSRP: $34.96
You Save: $11.96 (35%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Screw Cap For Expansion Tank; Cap, Reservoir Cap
- Replaces: 17-11-7-521-071
- Warranty: This genuine part is guaranteed by BMW's factory warranty.
Fits the following Vehicles:
- 2017-2023 BMW 540i | 6 Cyl 3.0 L MILD HYBRID EV-GAS (MHEV), Sedan(G30)
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BMW 540i Radiator Cap
Part Number: 17117639022
$23.00 MSRP: $34.96
You Save: $11.96 (35%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Cap, Filler Cap, Reservoir Cap
- Replaces: 17-11-1-742-231
- Warranty: This genuine part is guaranteed by BMW's factory warranty.
Fits the following Vehicles:
- 1997-2003 BMW 540i | Sedan(E39), Wagon(E39)
- 1994-1995 BMW 540i | Sedan(E34)
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BMW 540i Radiator Coolant Overflow Reservoir Expansion Tank Cap Cover
Part Number: 17111742231
$23.00 MSRP: $34.96
You Save: $11.96 (35%)
Ships in 1 Business Day
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Product Specifications
- Other Name: Radiator Cap
- Replaced by: 17117639022
- Warranty: This genuine part is guaranteed by BMW's factory warranty.
Fits the following Vehicles:
- 1994-1995 BMW 540i | Sedan(E34)
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BMW 540i Cap
Part Number: 17111723117
$5.20 MSRP: $6.25
You Save: $1.05 (17%)
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Product Specifications
- Other Name: Bleeder Valve Cap
- Warranty: This genuine part is guaranteed by BMW's factory warranty.
Fits the following Vehicles:
- 1997-2003 BMW 540i | Sedan(E39), Wagon(E39)
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BMW 540i Cover Lid
Part Number: 17117639024
$23.00 MSRP: $34.96
You Save: $11.96 (35%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Cap, Cover Cap, Radiator Cap, Reservoir Cap
- Replaced by: 17135A1BD89
- Warranty: This genuine part is guaranteed by BMW's factory warranty.
Fits the following Vehicles:
- 2017-2020 BMW 540i | Sedan(G30)
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BMW 540i SCREW PLUG, EXPANSION TANK
Part Number: 17135A1BD89
$23.00 MSRP: $34.96
You Save: $11.96 (35%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Cap, Cover Cap, Radiator Cap, Reservoir Cap
- Position: Passenger Side
- Replaces: 17-13-2-754-264, 17-11-7-639-024
- Warranty: This genuine part is guaranteed by BMW's factory warranty.
Fits the following Vehicles:
- 2017-2023 BMW 540i | 6 Cyl 3.0 L MILD HYBRID EV-GAS (MHEV), Sedan(G30)

BMW 540i Coolant Reservoir Cap

The pressurization of the cooling loop is achieved with the help of the BMW 540i Coolant Reservoir Cap. This helps the driver utilize the performance without worrying about sudden overheating of the car. The Coolant Reservoir Cap forms a close seal to keep air and dirt out, while precious coolant does not splash out during hard pulls on the highway or stop-and-go traffic. As its cap fits every 540i sedan or wagon from early metal tank builds to later lightweight plastic setups, the 540i cap can easily be fitted by any 540i owner in minutes, bringing back factory-level efficiency straight away. Every Coolant Reservoir Cap has a special spring valve that opens when heat expands the fluid. This allows the extra fluid to enter the surge tank. As the engine cools, the valve closes and pulls coolant back into the engine to maintain a steady volume. The intelligent pressure management system ensures that the internal passages remain clean, prevents corrosion, and upholds the robust oil film that enables the proud BMW V8 to rev freely. A leaking seal could ruin the cooling and cause an expensive head gasket failure, so this Coolant Reservoir Cap is designed tough enough to give you peace of mind on daily errands or cross-country trips. The compact size of the part cuts weight compared with a full tank swap, helping the 540i maintain its well-balanced handling character while preventing drips from metal-laden antifreeze. The Coolant Reservoir Cap features a textured grip ring that allows easy mounting and unmounting even with wet hands; its pressure rating is clearly molded to avoid guesswork. Supported by the brand's reputation for endurance, this Coolant Reservoir Cap is a small investment you can make as a buyer that will protect power, fuel economy, and passenger safety in the busy parts market. The BMW Coolant Reservoir Cap works with the precise 540i cooling map. Since BMW testing proves the Coolant Reservoir Cap survives extreme track heat, all daily 540i commuters and each BMW driver can enjoy quiet confidence.

If you are looking for OEM BMW 540i Coolant Reservoir Cap, we highly recommend to shop with us. Not only do we offer budget friendly prices, but we also provide fast delivery. In addition, we have a hassle-free return policy on all genuine BMW 540i Coolant Reservoir Cap that come backed by the manufacturer's warranty.