Koyo radiator, BMW 3-serie E46 / Z4 E86 4/6cyl (36mm)

Koyo Aluminium Performance Radiator for your BMW

Koyo aluminium performance radiators are engineered as direct-fit replacements for the factory radiator,
with increased cooling capacity and durability for demanding use. Each unit is designed to maintain stable
coolant temperatures in street, track day and competition environments, while retaining factory mounting points
and hose connections for straightforward installation. Made in Japan!

Manufacturer notes:
Core type: 36mm
Model info: BMW 3 E46 / Z4 E86 4/6cyl 01/98-
Fillerneck: No

Features

• High-quality all-aluminium construction with TIG-welded tanks
• Increased core thickness and surface area compared to OEM radiators
• Optimised fin density and tube design for efficient heat transfer
• Direct-fit design using factory mounting locations and fan shrouds
• Designed to work with standard radiator caps and coolant hoses (unless otherwise specified)
• Pressure-tested for reliability under sustained high load and temperature

For demanding use

• Improved coolant temperature stability in track, towing or high-power applications
• Reduced risk of heat-soak and overheating during repeated hard use
• Greater durability than plastic-tank OEM radiators, especially with age and vibration
• Suitable foundation for further performance upgrades such as higher boost levels or track use