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.

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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Aluminum Coolant Expansion Tank Reservoir - E9X M3

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

Price: $463.99
545.87

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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 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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Coolant Expansion Tank, Moroso - E30 M3 (1988-1991)

Aluminum coolant reservoir directly replaces BMW part # 17112225543.

Price: $395.51

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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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Aluminum Coolant Expansion Tank Reservoir - E82 128i/135i, E9X 325i/328i/330i/335i, E89 Z4

Prevent catastrophe by replacing your aged, fragile N51/N52/N54 plastic tank with a high-quality, long-lasting aluminum tank

Price: $386.99
455.28

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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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Coolant Expansion Tank - E39 M5 (2000-2003)

Original BMW plastic antifreeze reservior with level sensor

Price: $307.02
323.18

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

Stock replacement small coolant tank with hoses. Genuine replacement for BMW part #17132284601.

Price: $239.99

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Genuine BMW Coolant Expansion Tank Reservoir - E9X M3 (S65)

Stock replacement coolant tank for original cooling performance

Price: $194.97
235.55

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Genuine BMW Coolant Expansion Tank for E30 M3 '88-'91 - 17112225543

Replacement for your aged or damaged expansion tank

Price: $191.59
201.67

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Coolant Expansion Tank - E60 M5,E63 M6

Genuine BMW # 17112283345

Price: $188.33
198.24

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Coolant Expansion Tank, BMW - E28 M5, 524td

Genuine BMW Part Number 17112225352 / 17-11-2-225-352

Price: $179.18
188.61

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Expansion Tank Mounting Plate, BMW - E83 X3 Automatic

Expansion tank frame makes replacement a breeze!

Price: $172.49

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Coolant Expansion Tank - E34 M5

Genuine BMW # 17112227091

Price: $164.46
173.12

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Expansion Tank, BMW - F10 550i/M5, F13 650i/M6, F02 750i

Original replacement for your aged or damaged expansion tank. Genuine BMW part #17138610819. N63TU.

Price: $163.37
171.97

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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, BMW - G30 530i/540i G32 640i G12 740i

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

Price: $162.98
180.59

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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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Coolant Expansion Tank - E85 E86 Z4 M Coupe/Roadster (2006-2008)

Original BMW coolant reservoir for all E85/E86 Z4 M (S54 Engine).

Price: $160.17
168.60

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

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

Price: $155.61
163.80

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Genuine BMW Coolant Expansion Tank - E46 M3

This is the authentic Genuine BMW expansion tank for the E46 M3 cooling system, part # 17112283344

Price: $153.99
189.86

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Coolant Expansion Tank - E32 735i (1988-1994)

Replacement for your aged or damaged expansion tank.

Price: $152.11
160.12

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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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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 Expansion Tank, BMW - E82 128i/135i, E9X 325i/328i/330i/335i, E89 Z4

Factory replacement coolant tank for original cooling performance

Price: $147.06
154.80

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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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Coolant Expansion Tank, BMW - G26 i4 e40/M50

Replacement coolant reservoir for the cooling system

Price: $146.67
162.52

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

Expansion tank frame makes replacement a breeze!

Price: $145.71
161.45

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Coolant Expansion Tank - E34 530i 540i - E32 740i 740il 750il

Genuine BMW # 17111719110

Price: $140.29
147.67

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Coolant Expansion Tank Overhaul Package, OEM - E46 Automatic

Resolve a leaking E46 expansion tank with one package using an OEM tank

Price: $138.99
347.88

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Coolant Expansion Tank - E12 528i & 530i (1977-1981)

Genuine BMW Part Number 17111114743 / 17-11-1-114-743

Price: $135.24
142.36

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Coolant Expansion Tank - E28 533i 535i (1983-1988)

Original BMW Coolant Reservoir For E28 5-Series withe M30 engine

Price: $134.09
141.15

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

Genuine BMW Part # 17137642158 (17-13-7-642-158)

Price: $133.05
147.42

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

Original replacement for your aged or damaged expansion tank

Price: $133.05
147.42

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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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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, Genuine BMW - E30 325i 88+ & E36 M3 Euro

Replacement for your aged or damaged expansion tank

Price: $121.59
134.73

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Coolant Expansion Tank - E30 325e 325i & E28 528e (1982-1988)

Original BMW replacement for your aged or damaged expansion tank.

Price: $120.81
127.17

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Expansion Tanks

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

Price: $489.99

Aluminum Coolant Expansion Tank Reservoir - E9X M3

Price: $463.99 545.87

E36 Euro Expansion Tank Reservoir Relocation / Install Kit

Price: $427.99 444.76

E36 Aluminum Expansion Tank by Moroso

Price: $402.99 474.11

Coolant Expansion Tank, Moroso - E30 M3 (1988-1991)

Price: $395.51

E46 M3 Aluminum Expansion Tank by Moroso

Price: $392.99 462.34

Aluminum Coolant Expansion Tank Reservoir - E82 128i/135i, E9X 325i/328i/330i/335i, E89 Z4

Price: $386.99 455.28

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

Price: $339.99 382.93

Coolant Expansion Tank - E39 M5 (2000-2003)

Price: $307.02 323.18

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

Price: $239.99

Genuine BMW Coolant Expansion Tank Reservoir - E9X M3 (S65)

Price: $194.97 235.55

Genuine BMW Coolant Expansion Tank for E30 M3 '88-'91 - 17112225543

Price: $191.59 201.67

Coolant Expansion Tank - E60 M5,E63 M6

Price: $188.33 198.24

Coolant Expansion Tank, BMW - E28 M5, 524td

Price: $179.18 188.61

Expansion Tank Mounting Plate, BMW - E83 X3 Automatic

Price: $172.49

Coolant Expansion Tank - E34 M5

Price: $164.46 173.12

Expansion Tank, BMW - F10 550i/M5, F13 650i/M6, F02 750i

Price: $163.37 171.97

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

Price: $163.37 171.97

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

Price: $162.98 180.59

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

Price: $162.98 180.59

Coolant Expansion Tank - E85 E86 Z4 M Coupe/Roadster (2006-2008)

Price: $160.17 168.60

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

Price: $155.61 163.80

Genuine BMW Coolant Expansion Tank - E46 M3

Price: $153.99 189.86

Coolant Expansion Tank - E32 735i (1988-1994)

Price: $152.11 160.12

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

Price: $148.92 156.76

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

Price: $147.06 154.80

Coolant Expansion Tank, BMW - E82 128i/135i, E9X 325i/328i/330i/335i, E89 Z4

Price: $147.06 154.80

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

Price: $147.06 154.80

Coolant Expansion Tank, BMW - G26 i4 e40/M50

Price: $146.67 162.52

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

Price: $145.71 161.45

Coolant Expansion Tank - E34 530i 540i - E32 740i 740il 750il

Price: $140.29 147.67

Coolant Expansion Tank Overhaul Package, OEM - E46 Automatic

Price: $138.99 347.88

Coolant Expansion Tank - E12 528i & 530i (1977-1981)

Price: $135.24 142.36

Coolant Expansion Tank - E28 533i 535i (1983-1988)

Price: $134.09 141.15

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

Price: $133.05 147.42

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

Price: $133.05 147.42

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

Price: $132.34 139.30

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

Price: $132.34 139.30

Coolant Expansion Tank, Genuine BMW - E30 325i 88+ & E36 M3 Euro

Price: $121.59 134.73

Coolant Expansion Tank - E30 325e 325i & E28 528e (1982-1988)

Price: $463.99
545.87

Price: $427.99
444.76

Price: $402.99
474.11

Price: $392.99
462.34

Price: $386.99
455.28

Price: $339.99
382.93

Price: $307.02
323.18

Price: $194.97
235.55

Price: $191.59
201.67

Price: $188.33
198.24

Price: $179.18
188.61

Price: $164.46
173.12

Price: $163.37
171.97

Price: $163.37
171.97

Price: $162.98
180.59

Price: $162.98
180.59

Price: $160.17
168.60

Price: $155.61
163.80

Price: $153.99
189.86

Price: $152.11
160.12

Price: $148.92
156.76

Price: $147.06
154.80

Price: $147.06
154.80

Price: $147.06
154.80

Price: $146.67
162.52

Price: $145.71
161.45

Price: $140.29
147.67

Price: $138.99
347.88

Price: $135.24
142.36

Price: $134.09
141.15

Price: $133.05
147.42

Price: $133.05
147.42

Price: $132.34
139.30

Price: $132.34
139.30

Price: $121.59
134.73

Price: $120.81
127.17