Nissens 90859 Automatic Transmission Oil Cooler

Nissens 90859 Automatic Transmission Oil Cooler

The Nissens 90859 automatic transmission oil cooler is an aluminum thermal-management component built for Mercedes-Benz applications that require stable transmission fluid temperatures. It is a direct-fit style replacement for select Mercedes-Benz C63 AMG, C63 AMG S, GLC43 AMG, GLC300, E300, E450, E400, E43 AMG, S450, C300, C400, and C450 AMG models.

Designed around compact core dimensions and OE-style connections, this transmission cooler supports fluid temperature control in demanding driving conditions. Part number 90859 is also a cross-reference for Mercedes-Benz OE numbers 0995001900 and A0995001900 for the same application.

Key Features

• Aluminum construction for efficient heat transfer
• Core dimensions: 5.9100 length, 4.29 width, and 3.6200 height
• 15-core-row design for transmission fluid cooling performance
• 0.64 inlet and 0.64 outlet diameters
• Gasket or seal not included
• OE-style replacement for select Mercedes-Benz automatic transmission cooling systems

Fitment Details

• Fits 2023 Mercedes-Benz C63 AMG S, WITHOUT HOUSING
• Fits 2021 Mercedes-Benz C63 AMG S, WITHOUT HOUSING
• Fits 2021-2023 Mercedes-Benz GLC43 AMG, WITHOUT HOUSING
• Fits 2021 Mercedes-Benz C63 AMG, WITHOUT HOUSING
• Fits 2016-2020 Mercedes-Benz C63 AMG
• Fits 2015-2020 Mercedes-Benz C63 AMG S
• Fits 2019-2020 Mercedes-Benz E450
• Fits 2016-2020 Mercedes-Benz GLC300
• Fits 2017-2020 Mercedes-Benz GLC43 AMG
• Fits 2019-2020 Mercedes-Benz S450
• Fits 2017-2019 Mercedes-Benz E300
• Fits 2015-2018 Mercedes-Benz C300
• Fits 2018 Mercedes-Benz E400
• Fits 2017-2018 Mercedes-Benz E43 AMG
• Fits 2016 Mercedes-Benz C450 AMG
• Fits 2015 Mercedes-Benz C400

What It Helps Address

• Transmission fluid temperatures that run higher than expected
• Cooling-system service needs on Mercedes-Benz automatic transmissions
• Replacement of a damaged or leaking transmission oil cooler
• Fitment matching for Mercedes-Benz C63 AMG and GLC43 AMG cooling service
• OE-number replacement searches for 0995001900 and A0995001900

Installation Notes

Verify housing configuration before ordering, especially on 2021-2023 C63 AMG S and 2021 C63 AMG applications marked WITHOUT HOUSING. Confirm inlet and outlet sizing, core dimensions, and seal requirements against the original unit before installation. Because a gasket or seal is not included, reuse is not assumed and the correct sealing components should be sourced separately if needed.

Quality Assurance

Nissens develops and manufactures thermal and engine-efficiency components to consistent quality standards across its aftermarket range. The 90859 automatic transmission oil cooler reflects that engineering focus with aluminum construction and application-specific fitment for Mercedes-Benz models.