do88 Racing DKG/DCT Transmission Oil Cooler - BMW M3 (E90/E92/E93) 2007-2013

This do88 Racing cooler replaces the factory gearbox oil cooler on the S65 powered M3 with an 18-row Bar and Plate core carrying 2208 cm³ of core volume against the original 696 cm³, and 3456 cm² of active cooling area against 1242 cm². In do88's back to back testing oil left the cooler at 74°C where the original returned 90°C, an 18% reduction, and the larger core holds 0.65 litres of oil instead of 0.31 litres. CNC-machined oil line connections mate with every version of the factory oil lines and the CNC-machined brackets use the original mounting points, so it fits with no modifications. The cooler can be pre-filled before installation, so the whole system does not need to be drained and refilled.

Specifications

Documents: Installation Instructions (PDF)

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