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.

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

Replacement coolant reservoir identical to the original BMW part #17137640514

Price: $66.99
140.86

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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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Coolant Level Sensor O-Ring, CRP - E36 323i/325i/328i/M3, E34 525i, E39 528i/540i

O-ring to seal the level sensor in the expansion tank. OEM-type replacement for BMW part #61311361249.

Price: $1.99

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Coolant Level Sensor With Round Pins - E30 E34 E24 E32 (1987-1995)

Common cause of false warning light for coolant level

Price: $17.99
65.54

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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/Washer Level Sensor (installs in expansion tank) - Many BMW (see list)

High Quality Replacement to BMW # 17137553919

Price: $15.99
28.84

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Cooling System Plug, Rein - E60, F10, E63, F06/F13, F02

Blind plug used in a variety of places. OEM-type replacement for BMW part #11531436850.

Price: $5.99

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Cooling System Plug, Rein - F3X, E60, F10, G30, E63, F06/F12/F13, F02, X5/X6

Blind Plug/Cap used in a variety of locations on coolant hoses and connectors.

Price: $7.99

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E36 Aluminum Expansion Tank by Moroso

Factory-style replacement aluminum coolant expansion tank for all 6-cylinder E36 models

Price: $402.99
474.11

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E36 Euro Expansion Tank Reservoir Relocation / Install Kit

Installation kit for using the E36 Euro coolant reservoir on your U.S.-spec E36 6 cylinder

Price: $427.99
444.76

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E36 Euro-Style Expansion Tank Reservoir Relocation Kit (with E30 Tank)

Complete installation kit with an E30 3-series coolant reservoir for use on your US-spec E36 6-cylinder model.

Price: $489.99

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E46 323i/325i/328i/330i Aluminum Expansion Tank by Moroso

Prevent catastrophy by replacing your aged, fragile plastic tank with a high-quality, long-lasting aluminum tank

Price: $339.99
382.93

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E46 M3 Aluminum Expansion Tank by Moroso

Prevent catastrophe by replacing your aged, fragile plastic tank with a high-quality, long-lasting aluminum tank

Price: $392.99
462.34

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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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Expansion Tank - 17107514964

Aftermarket Replacement # 17 10 7 514 964, 24 Month Warranty

Price: $46.90
64.18

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Expansion Tank - 17111712835 - E36 / Z3 4-Cylinder and E34 525i

Aftermarket Replacement # 17 11 1 712 835, 24 Month Warranty

Price: $27.30
36.30

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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 - 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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Expansion Tank - URO - 17111741167

Aftermarket Replacement to BMW # 17111741167 with a 24 Month Warranty

Price: $31.34
37.65

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Expansion Tank Cap - 17111468077

Aftermarket Replacement # 17 11 1 468 077, 24 Month Warranty

Price: $3.28
4.43

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Expansion Tank Cap - 17114379047

Aftermarket replacement cap coolant reservoir on E28 828e, E24 633CSi, and early E30 325e/i models.

Price: $7.99
28.93

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Expansion Tank Cap - 17132754264

Aftermarket Replacement # 17 13 2 754 264, 24 Month Warranty

Price: $6.05
8.28

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Expansion Tank Cap, CRP - 2002, E21, E12, E28, Big Coupe, E24, E23 735i, E26 M1

Keep optimum cooling performance - replace your cap every three years!

Price: $10.99
21.89

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Expansion Tank Cap, CRP - E30 325i, E34 525i M20

Keep optimum cooling performance - replace your cap every three years!

Price: $13.99
26.23

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Expansion Tank Cap, Genuine BMW - E30 M3, E28 M5

Keep optimum cooling performance - replace your cap every three years! Genuine replacement for BMW part #17112227683

Price: $23.67
24.92

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Expansion Tank Cap, Reutter - Many Vintage BMW Applications

High quality replacement radiator cap with a 24 Month Warranty

Price: $11.99
20.15

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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 Tanks

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

Price: $66.99 140.86

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

Coolant Level Sensor O-Ring, CRP - E36 323i/325i/328i/M3, E34 525i, E39 528i/540i

Price: $1.99

Coolant Level Sensor With Round Pins - E30 E34 E24 E32 (1987-1995)

Price: $17.99 65.54

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

Price: $47.55 50.05

Coolant/Washer Level Sensor (installs in expansion tank) - Many BMW (see list)

Price: $15.99 28.84

Cooling System Plug, Rein - E60, F10, E63, F06/F13, F02

Price: $5.99

Cooling System Plug, Rein - F3X, E60, F10, G30, E63, F06/F12/F13, F02, X5/X6

Price: $7.99

E36 Aluminum Expansion Tank by Moroso

Price: $402.99 474.11

E36 Euro Expansion Tank Reservoir Relocation / Install Kit

Price: $427.99 444.76

E36 Euro-Style Expansion Tank Reservoir Relocation Kit (with E30 Tank)

Price: $489.99

E46 323i/325i/328i/330i Aluminum Expansion Tank by Moroso

Price: $339.99 382.93

E46 M3 Aluminum Expansion Tank by Moroso

Price: $392.99 462.34

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

Price: $162.98 180.59

Expansion Tank - 17107514964

Price: $46.90 64.18

Expansion Tank - 17111712835 - E36 / Z3 4-Cylinder and E34 525i

Price: $27.30 36.30

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

Price: $81.99 140.86

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

Price: $163.37 171.97

Expansion Tank - URO - 17111741167

Price: $31.34 37.65

Expansion Tank Cap - 17111468077

Price: $3.28 4.43

Expansion Tank Cap - 17114379047

Price: $7.99 28.93

Expansion Tank Cap - 17132754264

Price: $6.05 8.28

Expansion Tank Cap, CRP - 2002, E21, E12, E28, Big Coupe, E24, E23 735i, E26 M1

Price: $10.99 21.89

Expansion Tank Cap, CRP - E30 325i, E34 525i M20

Price: $13.99 26.23

Expansion Tank Cap, Genuine BMW - E30 M3, E28 M5

Price: $23.67 24.92

Expansion Tank Cap, Reutter - Many Vintage BMW Applications

Price: $11.99 20.15

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

Price: $33.99

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

Price: $69.99 142.30

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

Price: $66.99 133.94

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

Price: $70.99 97.00

Expansion Tank Kit, Rein - E60, E63

Price: $69.99

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

Price: $98.99 140.86

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

Price: $95.00 150.86

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Price: $66.99
140.86

Price: $90.25
177.05

Price: $91.99
106.73

Price: $17.99
65.54

Price: $47.55
50.05

Price: $15.99
28.84

Price: $402.99
474.11

Price: $427.99
444.76

Price: $339.99
382.93

Price: $392.99
462.34

Price: $162.98
180.59

Price: $46.90
64.18

Price: $27.30
36.30

Price: $81.99
140.86

Price: $163.37
171.97

Price: $31.34
37.65

Price: $3.28
4.43

Price: $7.99
28.93

Price: $6.05
8.28

Price: $10.99
21.89

Price: $13.99
26.23

Price: $23.67
24.92

Price: $11.99
20.15

Price: $69.99
142.30

Price: $66.99
133.94

Price: $70.99
97.00

Price: $98.99
140.86

Price: $95.00
150.86