HomeBelts and Cooling > Radiators, Coolers and Related ComponentsStandard Ignition ATO100 Automatic Transmission Oil Cooler Thermostat
Part #: ATO100

Standard Ignition ATO100 Automatic Transmission Oil Cooler Thermostat

57 vehicles fit this part
Select your vehicle to confirm fitment
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OE Direct Replacement — Bolt-on fit, no modifications needed
Fitment: BMW, Z4, 330Ci, 330i, 330xi, X3, X5, 320i, 325Ci, 325i, 325xi, 323Ci, 323i, 328Ci, and 328i
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Overview of Standard Ignition Automatic Transmission Oil Cooler Thermostat

The Standard Ignition ATO100 automatic transmission oil cooler thermostat is designed to regulate transmission fluid temperature for optimal performance. This part is compatible with a range of BMW models, including the 320i, 325i, 330i, X3, X5, and Z4, ensuring reliable transmission cooling and protection.

  • Compatible with BMW 320i, 323Ci, 325i, 328i, 330i, X3, X5, and Z4 models
  • Part number ATO100 for precise identification
  • Controls transmission fluid temperature to prevent overheating
  • Durable construction for long-lasting operation
  • Designed to integrate with existing transmission cooling systems

Product Details and Functionality

The Standard Ignition ATO100 automatic transmission oil cooler thermostat helps maintain the proper operating temperature of the transmission fluid in various BMW vehicles. By regulating fluid temperature, it prevents excessive heat buildup that can lead to transmission wear or failure. This thermostat is engineered to fit specific BMW models such as the 320i, 323i, 325Ci, 328Ci, 330xi, and SUVs like the X3 and X5, as well as the Z4 sports car. The part number ATO100 ensures compatibility and ease of replacement within the vehicle’s cooling system.

Common Applications and Problem Resolution

  • Prevents transmission fluid overheating during heavy driving conditions
  • Helps avoid premature transmission component wear
  • Reduces risk of transmission slipping caused by improper fluid temperature
  • Supports consistent transmission shifting performance
  • Mitigates potential damage from transmission fluid degradation

Installation Notes and Tips

Installation of the Standard Ignition ATO100 thermostat should be performed by a qualified technician familiar with BMW transmission systems. Ensure the vehicle is cooled down before beginning work. Properly drain transmission fluid as needed and verify the correct orientation of the thermostat during installation. After installation, check for leaks and confirm transmission fluid temperature regulation under normal operating conditions.

Quality Assurance and Warranty

Standard Ignition parts are manufactured to meet or exceed OEM specifications, providing reliable performance for BMW vehicles. The ATO100 automatic transmission oil cooler thermostat undergoes rigorous quality control to ensure durability and fitment accuracy. Warranty coverage details should be confirmed with the product documentation or supplier.

BrandStandard Ignition
Part NumberATO100
Attachment MethodDirect, Snap Fit
Contents1 Oil Cooler Thermostat

This part fits 57 vehicles. Search below:

YearMakeModelLitersCylindersPositionNotes
2008BMWZ43.0LL6N/A
2007BMWZ43.0LL6N/A
2006BMW330CiN/A
2006BMW330iN/A
2006BMW330xiN/A
2006BMWX3N/A
2006BMWX53.0LL6N/A
2006BMWZ43.0LL6N/A
2005BMW320iN/A
2005BMW325CiN/A
2005BMW325iN/A
2005BMW325xiN/A
2005BMW330CiN/A
2005BMW330iN/A
2005BMW330xiN/A
2005BMWX3N/A
2005BMWX53.0LL6N/A
2005BMWZ4N/A
2004BMW320iN/A
2004BMW325CiN/A
2004BMW325iN/A
2004BMW325xiN/A
2004BMW330CiN/A
2004BMW330iN/A
2004BMW330xiN/A
2004BMWX3N/A
2004BMWX53.0LL6N/A
2004BMWZ4N/A
2003BMW320iN/A
2003BMW325CiN/A
2003BMW325iN/A
2003BMW325xiN/A
2003BMW330CiN/A
2003BMW330iN/A
2003BMW330xiN/A
2003BMWX53.0LL6N/A
2003BMWZ4N/A
2002BMW320iN/A
2002BMW325CiN/A
2002BMW325iN/A
2002BMW325xiN/A
2002BMW330CiN/A
2002BMW330iN/A
2002BMW330xiN/A
2002BMWX53.0LL6N/A
2001BMW320iN/A
2001BMW325CiN/A
2001BMW325iN/A
2001BMW325xiN/A
2001BMW330CiN/A
2001BMW330iN/A
2001BMW330xiN/A
2001BMWX53.0LL6N/A
2000BMW323CiN/A
2000BMW323iN/A
2000BMW328CiN/A
2000BMW328iN/A

* Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.

This part directly replaces or is cross-referenced with the following part numbers:

17111437362902-5821OCT100OCT700

Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.