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Expansion Tanks

A BMW expansion tank ensures that your radiator is always full, even when cold, and provides a way for hot fluid to expand without releasing fluid on the road below you. Factory BMW tanks are made of plastic, and will eventually crack, leak and fail. BMW expansion tanks should be inspected during routine maintenance. We recommend replacing the expansion tank as a preventatively whenever you replace the radiator and coolant hoses. We also offer high-quality aluminum replacement tanks for some BMWs. Use our SEARCH BY MODEL feature to filter these items for your BMW.

Want to learn more about your BMW's cooling system? Check out our BMW cooling system tech page by clicking here.

Need help finding Expansion Tanks for your BMW? Call us at 877.639.9648, email us, or live chat for expert assistance.

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Engine Coolant Expansion Tank, BMW - G87 M2, G80 M3, G82 M4

OE replacement for your aged or damaged expansion tank. Replaces BMW part # 17138093924.

Price: $162.98

180.59
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Intake Coolant Expansion Tank, BMW - G87 M2, G80 M3, G82 M4

OE replacement for your aged or damaged expansion tank. Replaces BMW part #17138093925.

Price: $132.34

139.30
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Heater Pipe O-Ring - E46 323i/325i/328i/330i

Replacement o-ring for heater hoses and expansion tank

Price: $0.99

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Screw Plug for Coolant Expansion Tank - 17111707818 - E46,E53,E83,E85

Quality aftermarket drain plug for expansion tank on many E46, E83, E53, and E85/E86 models.

Price: $4.74

7.69
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Coolant Expansion Tank Kit, Rein - E82, E9X, E84 X1

Replacement coolant reservoir with cap and sensor is identical to the original BMW part #17137640514

Price: $77.99

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Coolant Expansion Tank, Aftermarket - F22 230i/M240i, F30 330i/340i, F32 430i/440i, B46, B58

Direct replacement for your aged or damaged expansion tank

Price: $62.99

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Coolant Expansion Tank, BMW - F22 230i/M240i, F30 330i/340i, F32 430i/440i, B46, B58

Genuine replacement for your aged or damaged expansion tank

Price: $147.06

154.80
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Charge Air Cooler Reservoir, BMW - F22 230i/M240i, F30 330i/340i, F32 430i/440i, B46, B58

Genuine replacement for your aged or damaged expansion tank

Price: $119.74

132.67
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Charge Air Cooler Expansion Tank, BMW - X3/X3M, X4/X4M, X5/X5M, X6/X6M, X7, XM

Coolant reservoir tank dedicated to the intake charge air cooler system

Price: $132.34

139.30
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Coolant Expansion Tank, BMW - G01 X3, F97 X3M, G02 X4, F98 X4M

Coolant reservoir tank for the main engine and turbo cooling system

Price: $147.06

154.80
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Coolant Tank Overflow Hose- S65 Engine - E90 E92 E93 M3

Original BMW coolant vent hose connects the expansion tank to the upper radiator hose.

Price: $47.55

50.05
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Coolant Expansion Tank, BMW - G26 i4 e40/M50

Replacement coolant reservoir for the cooling system

Price: $146.67

162.52
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Coolant Expansion Tank Cap, BMW - G26 i4 e40/M50

Replacement pressure-regulating cap for the cooling system

Price: $22.58

27.96
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Coolant Expansion Tank, OEM - F22 228i, F3X 328i/428i, N20, N26

OEM Replacement for BMW Part # 17137642158 (17-13-7-642-158)

Price: $79.99

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Expansion Tank - F80 M3, F82/F83 M4, F87 M2 Comp (S55) - 17132284600

The stock coolant overflow / expansion tank, Genuine BMW part number 17132284600 (17 13 2 284 600)

Price: $163.37

171.97
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Coolant Expansion Tank, Meyle - F48 X1, F39 X2, MINI F54/F56/F55/F60

Direct replacement for your aged or damaged expansion tank

Price: $69.99

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Charge Air Cooler Reservoir - F22 230i/M240i, F30 330i/340i, F32 430i/440i, B46, B58

Replacement for your aged or damaged expansion tank

Price: $78.99

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Charge Air Cooler Reservoir Cap - Many 2015+ Models

Keep optimum cooling performance - replace your cap every three years! Replacement for BMW part #17117639024

Price: $7.99

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Coolant Expansion Tank Kit, Aftermarket - F22 230i/M240i, F30 330i/340i, F32 430i/440i, B46, B58

Direct replacement tank, cap, sensor for your aged or damaged expansion tank

Price: $117.99

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OEM Coolant Expansion Tank - E85 E86 Z4 2.5i 3.0i 3.0si (M54 & N52)

Mahle-Behr OEM antifreeze coolant reservoir for Z4 coupe and roadster models (2003-2008).

Price: $63.96

143.93
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Genuine BMW Coolant Expansion Tank - E85 E86 Z4 2.5i 3.0i 3.0si

Original BMW antifreeze coolant reservoir for Z4 coupe and roadster models with the M54 or N52 engine (2003-2008).

Price: $148.92

156.76
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