Nissens 90658 Automatic Transmission Oil Cooler

Nissens 90658 Automatic Transmission Oil Cooler

The Nissens 90658 automatic transmission oil cooler is built for BMW applications that need stable transmission fluid temperatures and reliable heat exchange. With an aluminum core, integrated seal, and OE-style dimensions, it is a direct-fit cooling component for select BMW 540i, 740i, 740iL, and 750iL models.

Key Features

• Aluminum construction for efficient thermal transfer
• Core dimensions: 6.3800 in. length, 4.45 in. height, and 3.86 in. width
• 11-core row design for transmission fluid cooling performance
• Inlet diameter: 0.73 in.; outlet diameter: 0.43 in.
• Gasket or seal included for proper sealing at installation
• OE-style replacement for BMW automatic transmission cooling systems

Product Details

Nissens part number 90658 is an automatic transmission oil cooler engineered for thermal management in BMW drivetrain systems. Nissens develops and manufactures thermal components to consistent quality standards, and this cooler reflects that approach with aluminum construction, compact core sizing, and a seal included for service replacement. It is a strong match for BMW 540i, BMW 740i, BMW 740iL, and BMW 750iL fitments across the 1998-2003 model years, including 1998 vehicles built from 09/1998.

This part cross-references BMW 17211437771 and URO 17217505823 for the same application.

What It Helps Address

• Excess transmission fluid temperature
• Reduced cooling efficiency in the transmission circuit
• Fluid leakage at the cooler sealing surface
• Heat-related transmission performance concerns
• Service replacement for worn or damaged OE cooler units

Installation Notes and Tips

• Verify BMW fitment by year and model before installation.
• Inspect cooler lines, fittings, and surrounding seals for wear before reassembly.
• Confirm inlet and outlet sizing matches the vehicle connection points.
• Flush the transmission cooling circuit if contamination is present.
• Use the included gasket or seal during installation to help maintain a proper seal.

Quality Assurance

Nissens manufactures thermal management components for the aftermarket with a focus on consistent material and dimensional quality. Part number 90658 is built as a direct replacement for select BMW transmission cooling applications and is backed by Nissens product quality standards.