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.

Bracket for Coolant Expansion Tank, BMW - E85/E86 Z4 Manual

Original BMW mounting bracket attaches the coolant reservoir to the radiator.

Price: $75.69
89.56

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Coolant Expansion Tank, Behr OEM - F10 528i 528ix N20 4-Cylinder (2012-2016)

OEM coolant reservoir for F10 528i sedan with the 4-cylinder N20 engine.

Price: $77.86
146.44

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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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Expansion Tank Thermostat (75C), Mahle Behr - E83 X3 3.0si Automatic

High quality, 24 Month Warranty

Price: $78.99
88.25

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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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Coolant Expansion Tank - OEM - E60/E61 5 Series, E63/E64 6 Series

OEM Replacement Coolant Expansion Tank For Most E60, E61 5-Series and E63/E64 6-Series

Price: $79.19
146.44

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Coolant Expansion Tank, Aftermarket - F22 M235i, F87 M2 N55, F3X 328d/335i/435i

High quality replacement for your aged or damaged expansion tank

Price: $79.99

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Expansion Tank Mounting Plate, Rein - E53 X5 4.4/4.6is/4.8is

Expansion tank frame makes replacement a breeze!

Price: $79.99
141.02

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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, OEM - F10 528i 2011 (N52)

Replacement for your aged or leaking expansion tank. OEM-type replacement for BMW part #17137647284

Price: $81.99
150.86

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Expansion Tank - 17138621092 - E70,E71,F15,F16, F85, F86 - Behr

OEM Expansion Tank With Level Sensor

Price: $81.99
140.86

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Expansion Tank Vent Hose, BMW - F22 M235iR/M240iR

Vent hose from expansion tank on Racing models.

Price: $86.99

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Coolant Expansion Tank Kit, Rein - E53 X5 4.4/4.6is M62, Z3 non-M

Replacement coolant reservoir identical to the original BMW part #17107514964

Price: $87.99

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Coolant Expansion Tank Kit, Rein - E65/E66 745i/750i/760Li

Kit with coolant reservoir, cap, and level sensor. OEM-type replacements for BMW part #17137647713

Price: $89.99
108.00

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Coolant Expansion Tank, Rein - G30 530i 540i G32 640i G12 740i

Quality aftermarket coolant reservoir for B48/B58-powered 5, 6, 7, and 8-series models.

Price: $90.25
177.05

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

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

Price: $91.99
106.73

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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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Coolant Expansion Tank Kit, Rein - E90 335d

Replacement coolant reservoir identical to the original BMW part #17138570079

Price: $97.99
140.86

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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.

Price: $98.03
103.19

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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, BMW - E53 X5 4.4/4.8is N62

Replacement coolant reservoir identical to the original BMW part #17137501959

Price: $99.99
158.22

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Coolant Expansion Tank - E24 633CSi 635CSi (1983-1989)

Original BMW coolant reservoir for E24 6-Series

Price: $101.25
112.19

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Coolant Expansion Tank Kit, Rein - E82 135i, E9X 335i, E84 X1

Replacement coolant reservoir, cap, sensor identical to the original BMW part #17137640515

Price: $101.99
140.86

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Coolant Expansion Tank Kit, Rein - E70, F15, F85 X5M, E71, F16, F86 X6M

Replacement coolant reservoir kit identical to the original BMW part #17138621092

Price: $108.99
140.86

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Coolant Expansion Tank Overhaul Package - E46 Manual

Resolve a leaking E46 expansion tank with one package

Price: $109.99
119.95

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Expansion Tank Mounting Bracket - E46 - Manual Trans

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

Price: $113.93
126.24

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Expansion Tank Mounting Plate, BMW - E53 X5 Automatic

Expansion tank frame makes replacement a breeze!

Price: $114.71
127.10

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Expansion Tank Mounting Plate, Rein - E83 X3 Automatic

Expansion tank frame makes replacement a breeze!

Price: $115.99
221.52

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Coolant Expansion Tank, Genuine BMW - F39 X2 M35i

Original BMW Expansion Tank for engine coolant on 2018+ X2 M35i.

Price: $117.61
123.80

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Coolant Expansion Tank, Genuine BMW - F48 X1 F39 X2 28i

Original BMW Expansion Tank for engine coolant on 4-cylinder X1 and X2 models.

Price: $117.61
123.80

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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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Charge Air Cooler Coolant Reservoir, BMW - F8X M3/M4

Stock replacement small coolant tank for original cooling performance. Genuine replacement for BMW part #17132284601.

Price: $119.74
132.67

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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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Coolant Expansion Tank - OEM - E60/E61 5 Series, E63/E64 6 Series

Original BMW Replacement Coolant Expansion Tank For Most E60, E61 5-Series and E63/E64 6-Series

Price: $120.73
139.17

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Expansion Tanks

Bracket for Coolant Expansion Tank, BMW - E85/E86 Z4 Manual

Price: $75.69 89.56

Coolant Expansion Tank, Behr OEM - F10 528i 528ix N20 4-Cylinder (2012-2016)

Price: $77.86 146.44

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

Price: $77.99

Expansion Tank Thermostat (75C), Mahle Behr - E83 X3 3.0si Automatic

Price: $78.99 88.25

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

Price: $78.99

Coolant Expansion Tank - OEM - E60/E61 5 Series, E63/E64 6 Series

Price: $79.19 146.44

Coolant Expansion Tank, Aftermarket - F22 M235i, F87 M2 N55, F3X 328d/335i/435i

Price: $79.99

Expansion Tank Mounting Plate, Rein - E53 X5 4.4/4.6is/4.8is

Price: $79.99 141.02

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

Price: $79.99

Expansion Tank, OEM - F10 528i 2011 (N52)

Price: $81.99 150.86

Expansion Tank - 17138621092 - E70,E71,F15,F16, F85, F86 - Behr

Price: $81.99 140.86

Expansion Tank Vent Hose, BMW - F22 M235iR/M240iR

Price: $86.99

Coolant Expansion Tank Kit, Rein - E53 X5 4.4/4.6is M62, Z3 non-M

Price: $87.99

Coolant Expansion Tank Kit, Rein - E65/E66 745i/750i/760Li

Price: $89.99 108.00

Coolant Expansion Tank, Rein - G30 530i 540i G32 640i G12 740i

Price: $90.25 177.05

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

Price: $91.99 106.73

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

Price: $95.00 150.86

Coolant Expansion Tank Kit, Rein - E90 335d

Price: $97.99 140.86

Expansion Tank Mounting Bracket - E46 E85 Z4 with Auto Trans

Price: $98.03 103.19

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

Price: $98.99 140.86

Expansion Tank, BMW - E53 X5 4.4/4.8is N62

Price: $99.99 158.22

Coolant Expansion Tank - E24 633CSi 635CSi (1983-1989)

Price: $101.25 112.19

Coolant Expansion Tank Kit, Rein - E82 135i, E9X 335i, E84 X1

Price: $101.99 140.86

Coolant Expansion Tank Kit, Rein - E70, F15, F85 X5M, E71, F16, F86 X6M

Price: $108.99 140.86

Coolant Expansion Tank Overhaul Package - E46 Manual

Price: $109.99 119.95

Expansion Tank Mounting Bracket - E46 - Manual Trans

Price: $113.93 126.24

Expansion Tank Mounting Plate, BMW - E53 X5 Automatic

Price: $114.71 127.10

Expansion Tank Mounting Plate, Rein - E83 X3 Automatic

Price: $115.99 221.52

Coolant Expansion Tank, Genuine BMW - F39 X2 M35i

Price: $117.61 123.80

Coolant Expansion Tank, Genuine BMW - F48 X1 F39 X2 28i

Price: $117.61 123.80

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

Price: $117.99

Charge Air Cooler Coolant Reservoir, BMW - F8X M3/M4

Price: $119.74 132.67

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

Price: $119.74 132.67

Coolant Expansion Tank - OEM - E60/E61 5 Series, E63/E64 6 Series

Price: $120.73 139.17

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Price: $75.69
89.56

Price: $77.86
146.44

Price: $78.99
88.25

Price: $79.19
146.44

Price: $79.99
141.02

Price: $81.99
150.86

Price: $81.99
140.86

Price: $89.99
108.00

Price: $90.25
177.05

Price: $91.99
106.73

Price: $95.00
150.86

Price: $97.99
140.86

Price: $98.03
103.19

Price: $98.99
140.86

Price: $99.99
158.22

Price: $101.25
112.19

Price: $101.99
140.86

Price: $108.99
140.86

Price: $109.99
119.95

Price: $113.93
126.24

Price: $114.71
127.10

Price: $115.99
221.52

Price: $117.61
123.80

Price: $117.61
123.80

Price: $119.74
132.67

Price: $119.74
132.67

Price: $120.73
139.17