How do the Transmission Oil Cooler and ATF lines contribute to efficient heat exchange in the transmission, and what precautions should be taken when working on the cooling system on BMW 335i?

ATF lines run from the transmission to the back part of the radiator proceeding to the ATF cooler. Cold start of an engine warms the engine coolant more than warms the transmission fluid by circulating the heat from the coolant, and improves the efficiency of the drag in the transmission to entail better fuel economy. When the ATF is at the normal running temperature it tends to be slightly hotter than the engine coolant and serves as a cooling apparatus for the ATF heat exchanger. That is why when dealing with the cooling system, it is always wrong to pour cold water into the coolant when the engine is hot or has overheated; if at all, one must use hot water to mix with the coolant while the engine is running and the water pump is also functioning. To try and avoid further formation of silicate gel, deposition and the potential reduction of cooling capacity, it is better to use BMW coolant or its equivalent low silicate antifreeze. When oil has been admitted into the cooling system, the radiator together with the expansion tank and heating circuit require washing with a cleaning agent and it is advisable that the radiator and expansion tank be detached for thorough washing. Also, if there is a job on the cooling system, the alternator must be blanked off to prevent drips on hot components and before disconnecting the battery, one should know some important precautions about battery disconnection.

How do ATF lines and the heat exchanger impact the Transmission Oil Cooler and fuel mileage on BMW X3?

ATF lines link the transmission to the ATF cooler which is a conventional type cooler situates at the back of the radiator. In cold engine start up, the engine water is heated up more as compared to the transmission fluid. The heat from the engine coolant is used to further heat the ATF higher so there is less internal drag in the transmission and helps gain an extra few miles per gallon. After the ATF rises to normal operating temperature it is hotter than engine coolant; thus, the ATF heat exchanger becomes a cooler.

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88 Transmission Oil Coolers found

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BMW Transmission Oil Cooler
Part Number: 17217600553
$295.49 MSRP: $436.19
You Save: $140.70 (33%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Heat Exchanger; Oil Cooler, Transmission Cooler
Fits the following BMW Models:
- 228i | 2014-2016 | Convertible N20 Engine(F23), Convertible N26 Engine(F23), Coupe N20 Engine(F22), Coupe N26 Engine(F22), N20 Engine(F22), N26 Engine(F22)
- 228i xDrive | 2015-2016 | Convertible N20 Engine(F23), Convertible N26 Engine(F23), Coupe N20 Engine(F22), Coupe N26 Engine(F22)
- 320i | 2013-2018 | Sedan(F30)
- 320i xDrive | 2013-2018 | Sedan(F30)
- 328i | 2012-2016 | N20 Engine(F30), N26 Engine(F30), Sedan N20 Engine(F30), Sedan N26 Engine(F30), Wagon(F31)
- 328i GT | 2013-2015 | F34
- 328i GT xDrive | 2014-2016 | N20 Engine(F34), N26 Engine(F34)
- 328i xDrive | 2013-2016 | Sedan N20 Engine(F30), Sedan N26 Engine(F30), Sedan(F30), Wagon(F31)
- 335i | 2012-2015 | Sedan(F30)
- 335i GT xDrive | 2014-2016 | F34
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BMW Transmission Oil Cooler Heat Exchanger
Part Number: 17217640013
$279.26 MSRP: $412.22
You Save: $132.96 (33%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Heat Exchanger; Oil Cooler, Transmission Cooler
Fits the following BMW Models:
- X1 | 2016-2019 | sDrive28i(F48), xDrive28i(F48)
- X2 | 2018-2019 | sDrive28i(F39), xDrive28i(F39)
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BMW Transmission Oil Cooler
Part Number: 17219487254
$369.20 MSRP: $509.84
You Save: $140.64 (28%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Oil Cooler, Transmission Cooler
Fits the following BMW Models:
- X3 | 2020-2024 | 4 Cyl 2.0 L GAS, 4 Cyl 2.0 L PLUG-IN HYBRID EV-GAS (PHEV), 6 Cyl 3.0 L GAS, 6 Cyl 3.0 L MILD HYBRID EV-GAS (MHEV), M40i(G01), sDrive30i(G01), xDrive30e(G01), xDrive30i(G01)
- X3 M | 2021-2024 | 4 Cyl 2.0 L GAS, 4 Cyl 2.0 L PLUG-IN HYBRID EV-GAS (PHEV), 6 Cyl 3.0 L GAS, 6 Cyl 3.0 L MILD HYBRID EV-GAS (MHEV)
- X4 | 2020-2024 | 4 Cyl 2.0 L GAS, 6 Cyl 3.0 L GAS, 6 Cyl 3.0 L MILD HYBRID EV-GAS (MHEV), M40i(G02), xDrive30i(G02)
- X4 M | 2021-2024 | 4 Cyl 2.0 L GAS, 6 Cyl 3.0 L GAS, 6 Cyl 3.0 L MILD HYBRID EV-GAS (MHEV)
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BMW Transmission Oil Cooler
Part Number: 17218514515
$369.20 MSRP: $509.84
You Save: $140.64 (28%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Oil Cooler, Transmission Cooler
Fits the following BMW Models:
- 230i | 2017-2021 | 4 Cyl 2.0 L GAS, Convertible(F23), Coupe(F22)
- 230i xDrive | 2017-2021 | 4 Cyl 2.0 L GAS, Convertible(F23), Coupe(F22)
- 330i | 2017-2018 | Sedan(F30)
- 330i GT xDrive | 2017-2019 | F34
- 330i xDrive | 2017-2019 | Sedan(F30), Wagon(F31)
- 430i | 2017-2020 | Convertible(F33), Coupe(F32)
- 430i Gran Coupe | 2017-2020 | F36
- 430i xDrive | 2017-2020 | Convertible(F33), Coupe(F32)
- 430i xDrive Gran Coupe | 2017-2020 | F36
- M2 | 2021 | 6 Cyl 3.0 L GAS
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BMW Transmission Oil Cooler
Part Number: 17217638678
$316.47 MSRP: $437.02
You Save: $120.55 (28%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Oil Cooler, Thermostat, Transmission Cooler
- Replaces: 17-21-7-599-546, 17-22-7-572-541, 17-22-7-597-890, 17-21-7-572-540, 17-21-7-638-681, 17-21-8-624-132
Fits the following BMW Models:
- 535i | 2010-2016 | Sedan(F10)
- 535i GT | 2010-2017 | F07
- 535i GT xDrive | 2014-2017 | F07
- 640i | 2012-2018 | Convertible(F12), Coupe(F13)
- 640i Gran Coupe | 2013-2019 | F06
- 740Li | 2011-2015 | Sedan(F02)
- 740i | 2011-2015 | Sedan(F01)
- 750Li | 2009-2015 | ActiveHybrid(F04), Base(F02), Sedan(F02)
- 750Li xDrive | 2010-2015 | Sedan(F02)
- 750i | 2009-2015 | ActiveHybrid(F04), Base(F01), Sedan(F01)
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BMW Remote Mounted Radiator
Part Number: 17118620207
$349.66 MSRP: $516.16
You Save: $166.50 (33%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: External Radiator
Fits the following BMW Models:
- 530e | 2018-2020 | Sedan(G30)
- 530e xDrive | 2018-2020 | Sedan(G30)
- 530i | 2017-2020 | Sedan(G30)
- 530i xDrive | 2017-2020 | Sedan(G30)
- 540i | 2017-2023 | 6 Cyl 3.0 L MILD HYBRID EV-GAS (MHEV), Sedan(G30)
- 540i xDrive | 2017-2023 | 6 Cyl 3.0 L MILD HYBRID EV-GAS (MHEV), Sedan(G30)
- 640i xDrive Gran Turismo | 2018-2019 | G32
- 740e xDrive | 2017-2019 | Sedan(G12)
- 740i | 2016-2025 | 6 Cyl 3.0 L GAS, Sedan(G12)
- 740i xDrive | 2017-2022 | 6 Cyl 3.0 L GAS, Sedan(G12)
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BMW Transmission Oil Cooler With Thermostat
Part Number: 17217647315
$280.73 MSRP: $414.40
You Save: $133.67 (33%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Heat Exchanger; Oil Cooler, Transmission Cooler
Fits the following BMW Models:
- X5 | 2011-2018 | sDrive35i(F15), xDrive35d(E70), xDrive35i(E70), xDrive35i(F15), xDrive40e(F15), xDrive50i(F15)
- X6 | 2008-2019 | sDrive35i(F16), xDrive35i(E71), xDrive35i(F16), xDrive50i(E71), xDrive50i(F16)
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BMW Transmission Oil Cooler
Part Number: 17217593856
$351.63 MSRP: $485.56
You Save: $133.93 (28%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Oil Cooler
Fits the following BMW Models:
- X3 | 2011-2017 | sDrive28i(F25), xDrive28i(F25), xDrive35i(F25)
- X4 | 2015-2018 | M40i(F26), xDrive28i(F26), xDrive35i(F26)
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BMW Transmission Oil Cooler Heat Exchanger
Part Number: 17217553389
$381.98 MSRP: $454.22
You Save: $72.24 (16%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Heat Exchanger; Oil Cooler, Transmission Cooler
Fits the following BMW Models:
- X5 | 2007-2013 | 3.0si(E70), 4.8i(E70), xDrive30i(E70), xDrive35d(E70), xDrive35i(E70), xDrive48i(E70), xDrive50i(E70)
- X6 | 2008-2014 | ActiveHybrid(E72), xDrive35i(E71), xDrive50i(E71)
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BMW Oil Cooler Engine Transmission
Part Number: 17227521376
$439.54 MSRP: $606.97
You Save: $167.43 (28%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Oil Cooler; Oil Cooler Assembly, Transmission Cooler
Fits the following BMW Models:
- 335i | 2007-2013 | Convertible(E93), Coupe(E92), Sedan(E90)
- 335i xDrive | 2009-2013 | Coupe(E92), Sedan(E90)
- 335is | 2011-2013 | Convertible(E93), Coupe(E92)
- 335xi | 2007-2008 | Coupe(E92), Sedan(E90)
- M3 | 2008-2013 | Convertible(E93), Coupe(E92), Sedan(E90)
- X1 | 2013-2015 | xDrive35i(E84)
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BMW Automatic Transmission Oil Cooler
Part Number: 17217600550
$295.49 MSRP: $436.19
You Save: $140.70 (33%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Heat Exchanger; Oil Cooler, Transmission Cooler
Fits the following BMW Models:
- 335i | 2012-2015 | Sedan(F30)
- 335i xDrive | 2013-2015 | Sedan(F30)
- 435i | 2014-2016 | Convertible(F33), Coupe(F32)
- 435i Gran Coupe | 2015-2016 | F36
- 435i xDrive | 2014-2016 | Convertible(F33), Coupe(F32)
- 435i xDrive Gran Coupe | 2015-2016 | F36
- ActiveHybrid 3 | 2013-2015 | Sedan(F30)
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BMW Transmission Oil Cooler Heat Exchanger
Part Number: 17217589522
$280.73 MSRP: $414.40
You Save: $133.67 (33%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Heat Exchanger; Oil Cooler
Fits the following BMW Models:
- X5 M | 2015-2018, 2010-2013 | E70, F85
- X6 M | 2010-2019 | E71, F86
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BMW Transmission Oil Cooler
Part Number: 17218607237
$369.20 MSRP: $509.84
You Save: $140.64 (28%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Oil Cooler, Transmission Cooler
Fits the following BMW Models:
- 330e | 2016-2018 | Sedan(F30)
- 530i | 2017-2019 | Sedan(G30)
- 530i xDrive | 2017-2019 | Sedan(G30)
- X3 | 2018-2019 | sDrive30i(G01), xDrive30i(G01)
- X4 | 2019 | xDrive30i(G02)
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BMW Transmission Oil Cooler
Part Number: 64119361712
$207.34 MSRP: $266.68
You Save: $59.34 (23%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Heat Exchanger; Heater Core
Fits the following BMW Models:
- 530e | 2018-2023 | 4 Cyl 2.0 L PLUG-IN HYBRID EV-GAS (PHEV), Sedan(G30)
- 530e xDrive | 2018-2023 | 4 Cyl 2.0 L PLUG-IN HYBRID EV-GAS (PHEV), Sedan(G30)
- 530i | 2017-2023 | 4 Cyl 2.0 L GAS, Sedan(G30)
- 530i xDrive | 2017-2023 | 4 Cyl 2.0 L GAS, Sedan(G30)
- 540d xDrive | 2018 | Sedan(G30)
- 540i | 2017-2023 | 6 Cyl 3.0 L MILD HYBRID EV-GAS (MHEV), Sedan(G30)
- 540i xDrive | 2017-2023 | 6 Cyl 3.0 L MILD HYBRID EV-GAS (MHEV), Sedan(G30)
- 640i xDrive Gran Turismo | 2018-2019 | G32
- 740e xDrive | 2017-2019 | Sedan(G12)
- 740i | 2016-2022 | 6 Cyl 3.0 L GAS, Sedan(G12)
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BMW Transmission Oil Cooler
Part Number: 17112284503
$395.58 MSRP: $546.26
You Save: $150.68 (28%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Oil Cooler, Oil Cooler Pipe, Transmission Cooler
Fits the following BMW Models:
- M2 | 2019-2021 | 6 Cyl 3.0 L GAS, Competition(F87)
- M3 | 2015-2018 | Sedan(F80)
- M4 | 2015-2020 | Convertible(F83), Coupe Base(F82), Coupe CS(F82), Coupe GTS(F82), Coupe(F82)
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BMW Transmission Oil Cooler Line Heat Exchanger
Part Number: 17217638580
$295.49 MSRP: $436.19
You Save: $140.70 (33%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Heat Exchanger; Transmission Cooler
- Replaces: 17-21-7-601-951
Fits the following BMW Models:
- 528i | 2010-2011 | Sedan(F10)
- 550i | 2010-2016 | Sedan(F10)
- 550i GT | 2010-2015 | F07
- 550i GT xDrive | 2010-2017 | F07
- 550i xDrive | 2011-2016 | Sedan(F10)
- 650i | 2012-2018 | Convertible(F12), Coupe(F13)
- 650i Gran Coupe | 2013-2019 | F06
- 650i xDrive | 2012-2018 | Convertible(F12), Coupe(F13)
- 650i xDrive Gran Coupe | 2013-2019 | F06
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BMW Transmission Oil Cooler
Part Number: 17218642748
$369.20 MSRP: $509.84
You Save: $140.64 (28%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Oil Cooler, Transmission Cooler
Fits the following BMW Models:
- X5 | 2019-2025 | 6 Cyl 3.0 L GAS, 6 Cyl 3.0 L MILD HYBRID EV-GAS (MHEV), 6 Cyl 3.0 L PLUG-IN HYBRID EV-GAS (PHEV), xDrive40i(G05)
- X5 M | 2021-2025 | 6 Cyl 3.0 L GAS, 6 Cyl 3.0 L MILD HYBRID EV-GAS (MHEV), 6 Cyl 3.0 L PLUG-IN HYBRID EV-GAS (PHEV)
- X6 | 2020-2025 | 6 Cyl 3.0 L GAS, 6 Cyl 3.0 L MILD HYBRID EV-GAS (MHEV), 8 Cyl 4.4 L GAS, sDrive40i(G06), xDrive40i(G06)
- X6 M | 2021-2025 | 6 Cyl 3.0 L GAS, 6 Cyl 3.0 L MILD HYBRID EV-GAS (MHEV), 8 Cyl 4.4 L GAS
- X7 | 2019-2025 | 6 Cyl 3.0 L GAS, 6 Cyl 3.0 L MILD HYBRID EV-GAS (MHEV), 8 Cyl 4.4 L GAS, 8 Cyl 4.4 L MILD HYBRID EV-GAS (MHEV), xDrive40i(G07)
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BMW Automatic Transmission Oil Cooler
Part Number: 17217551647
$280.73 MSRP: $414.40
You Save: $133.67 (33%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Heat Exchanger; Oil Cooler, Transmission Cooler
Fits the following BMW Models:
- 128i | 2008-2013 | Convertible N51 Engine(E88), Convertible N52 Engine(E88), Coupe N51 Engine(E82), Coupe N52 Engine(E82)
- 323i | 2006-2011 | Sedan(E90)
- 325i | 2006 | Sedan(E90)
- 325xi | 2006 | Sedan(E90), Wagon(E91)
- 328i | 2007-2013 | Convertible N51 Engine(E93), Convertible N52 Engine(E93), Coupe N51 Engine(E92), Coupe N52 Engine(E92), Sedan N51 Engine(E90), Sedan N52 Engine(E90), Wagon(E91)
- 328i xDrive | 2009-2013 | Coupe N51 Engine(E92), Coupe N52 Engine(E92), Sedan N51 Engine(E90), Sedan N52 Engine(E90), Wagon(E91)
- 328xi | 2007-2008 | Coupe N51 Engine(E92), Coupe N52 Engine(E92), Sedan N51 Engine(E90), Sedan N52 Engine(E90), Wagon(E91)
- 330i | 2006 | Sedan(E90)
- 330xi | 2006 | Sedan(E90)
- X1 | 2013-2015 | sDrive28i(E84), xDrive28i(E84)
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BMW Transmission Oil Cooler
Part Number: 17217575243
$351.63 MSRP: $485.56
You Save: $133.93 (28%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Transmission Cooler
Fits the following BMW Models:
- 535i GT xDrive | 2011-2013 | F07
- 535i xDrive | 2011-2016 | Sedan(F10)
- 640i xDrive | 2014-2018 | Convertible(F12), Coupe(F13)
- 640i xDrive Gran Coupe | 2014-2019 | F06
- 740Li xDrive | 2013-2015 | Sedan(F02)
View More
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BMW Transmission Oil Cooler
Part Number: 17207500754
$501.31 MSRP: $601.26
You Save: $99.95 (17%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Heat Exchanger; Oil Cooler
- Replaces: 17-10-1-439-112
Fits the following BMW Models:
- X5 | 2000-2006 | 3.0i(E53), 4.4i(E53), 4.6is(E53)

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BMW Transmission Oil Cooler

Keeping the smooth operation of a BMW vehicle relies on the condition of the Transmission Oil Cooler. A broken BMW Transmission Oil Cooler can lead to big performance issues and even a complete vehicle breakdown. To prevent such problems, you could regularly maintain your car and replace your parts. At BMWPartsDeal, we offer high-quality BMW Transmission Oil Cooler, all designed to keep your vehicle running at its best. Choose BMWPartsDeal for your auto parts needs, you will get your vehicle back to great performance, and save a lot by avoiding costly future repair jobs.

BMW Transmission Oil Cooler Parts Questions & Experts Answers

Transmission Oil Cooler Heat Exchanger
17217536929
Q: How do the Transmission Oil Cooler and ATF lines contribute to efficient heat exchange in the transmission, and what precautions should be taken when working on the cooling system on BMW 335i?
A:
ATF lines run from the transmission to the back part of the radiator proceeding to the ATF cooler. Cold start of an engine warms the engine coolant more than warms the transmission fluid by circulating the heat from the coolant, and improves the efficiency of the drag in the transmission to entail better fuel economy. When the ATF is at the normal running temperature it tends to be slightly hotter than the engine coolant and serves as a cooling apparatus for the ATF heat exchanger. That is why when dealing with the cooling system, it is always wrong to pour cold water into the coolant when the engine is hot or has overheated; if at all, one must use hot water to mix with the coolant while the engine is running and the water pump is also functioning. To try and avoid further formation of silicate gel, deposition and the potential reduction of cooling capacity, it is better to use BMW coolant or its equivalent low silicate antifreeze. When oil has been admitted into the cooling system, the radiator together with the expansion tank and heating circuit require washing with a cleaning agent and it is advisable that the radiator and expansion tank be detached for thorough washing. Also, if there is a job on the cooling system, the alternator must be blanked off to prevent drips on hot components and before disconnecting the battery, one should know some important precautions about battery disconnection.
Transmission Oil Cooler
17227551636
Q: How do ATF lines and the heat exchanger impact the Transmission Oil Cooler and fuel mileage on BMW X3?
A:
ATF lines link the transmission to the ATF cooler which is a conventional type cooler situates at the back of the radiator. In cold engine start up, the engine water is heated up more as compared to the transmission fluid. The heat from the engine coolant is used to further heat the ATF higher so there is less internal drag in the transmission and helps gain an extra few miles per gallon. After the ATF rises to normal operating temperature it is hotter than engine coolant; thus, the ATF heat exchanger becomes a cooler.

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