Mishimoto BMW G8X M3/M4 Transmission Cooler 2021-2026

The Mishimoto performance transmission cooler for the 2021+ BMW G8X M2, M3, and M4 keeps the ZF 8HP transmission at optimal temperature behind the S58 engine — important once a tune and bolt-ons push more torque than the stock cooler can handle, which can otherwise cause high oil temps, sluggish shifts, and transmission damage. It delivers a 41% increase in core volume and 17% greater fluid capacity, with internal cooling fins for more fluid-contact surface area and a dual-pass design that keeps fluid in the cooler longer to remove more heat without reducing airflow to components behind it.

Specifications

This part fits:

Shipping

• In-stock orders placed before 3 PM EST ship the same day — everything else ships within 24 hours.
• Standard, expedited, and overnight options at checkout.
• Oversized items ship by freight and take longer.
• Backordered items ship as soon as stock lands — contact us for lead times.
• International orders: prices do not include VAT, duties, or import fees. Your country charges these at import and they are the buyer’s responsibility.

Returns

• 30-day returns on new, uninstalled items in original packaging with all hardware.
• Standard returns: 8% restocking fee, buyer pays return shipping. Both waived if the item is defective or we made the error.
• Installed or used parts can’t be returned — confirm fitment before you install.
• Special orders and custom items are final sale.
• Email us for return authorization before shipping anything back.

Full details: Shipping Policy · Refund Policy