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.

Expansion Tank for Engine Coolant, BMW - G30 G12 G05 G06 G07 F95 F96

Original BMW reservoir for engine coolant on select N63 and S63 V8 applications.

Price: $162.99
186.00

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Expansion Tank for Engine Coolant, BMW - G30 G12 G14 G15 G16 (N63B)

Original BMW reservoir for N63B V8 engine coolant on G30 M550i, G12 750i, and G14/G15/G16 M850i models.

Price: $162.99
180.59

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Expansion Tank for Engine Coolant, BMW - G42 G20 G22 G26 G29

Original BMW reservoir for engine coolant on G42 2-series, G20 3-series, G22/G23/G26 4-series, and G29 Z4 models.

Price: $156.24
186.00

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Expansion Tank for Engine Coolant, BMW - U11 X1 & U10 X2

Original BMW reservoir for B48P/B48R engine coolant on U11 X1 and U10 X2 models

Price: $164.46
186.00

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Expansion Tank for Intercooler - F10 F90 F06 F12 F13 F91 F92 F93 F15

Original BMW coolant expansion tank for intercooler circuit on F10/F90 M5, F06/F12/F13 M6, F91/F92/F93 M8, and F15 X5 50i models.

Price: $172.44
189.78

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Expansion Tank for Intercooler Coolant, BMW - G42 G20 G22 G26 G29

Original BMW coolant reservoir for charge-air intercooler on G42 2-series, G20 3-series, G22/G23/G26 4-series, and G29 Z4 models.

Price: $142.86
159.44

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Expansion Tank for Intercooler, BMW - G30 G12 G15 G05 G06 G07 (N63R N63B)

Expansion Tank for Intercooler Coolant, BMW - G30 G12 G15 G05 G06 G07 (N63R N63B) - 17138610658

Price: $138.99
159.44

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Expansion Tank for Low Temp Radiator, BMW - U11 X1 & U10 X2

Original BMW small reservoir for B48R engine coolant on U11 X1 and U10 X2 M35i models.

Price: $139.90
159.44

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Expansion Tank Kit, Rein - E30 318i, E36 318i/318ti, E34 525i, Z3 1.9

Replacement coolant reservoir identical to the original BMW part #17111712835

Price: $33.99

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Expansion Tank Kit, Rein - E39 525i/528i/530i

Kit with coolant reservoir, cap, and level sensor. OEM-type replacements for BMW part #17111436381.

Price: $69.99
142.30

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Expansion Tank Kit, Rein - E39 540i, E38 740i/iL/750iL, E31 840i/850i

Kit includes reservoir, cap, and sensor. OEM-type replacement for BMW part #17111741167

Price: $66.99
133.94

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Expansion Tank Kit, Rein - E53 X5 4.4/4.8is N62

Replacement coolant reservoir kit identical to the original BMW part #17137501959 with additional parts

Price: $70.99
97.00

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Expansion Tank Kit, Rein - E60, E63

Replacement coolant reservoir kit identical to the original BMW part #17137542986

Price: $69.99

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Expansion Tank Kit, Rein - F10 535d/535i, F06/F12/F13 640i, F02 740i N55

Replacement coolant reservoir identical to the original BMW part #17137647283

Price: $98.99
140.86

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Expansion Tank Kit, Rein - F10 550i, F06/F12/F13 650i, F02 750i

Kit of reservoir, cap, and sensor replaces original BMW part #17137601948. N63A.

Price: $95.00
150.86

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Expansion Tank Mounting Bracket - E46 - Manual Trans

Expansion tank frame for manual transmission models. Replaces BMW part #17111436250.

Price: $106.02
109.30

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Expansion Tank Mounting Bracket - E46 E85 Z4 with Auto Trans

Expansion tank frame for automatic transmission models. Replaces BMW part # 17111436251.