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Aluminum coolant expansion tank for the E46 M3. Stronger and more reliable than the factory plastic tank, which commonly gets brittle with age and can crack under heat and pressure.

Built as a direct replacement for the stock tank. Ideal for track cars, high-temp use, or anyone replacing a failure-prone OEM unit.

This tank does not use the factory coolant level sensor. To clear the “Check Coolant” warning, the sensor wires will need to be shorted.

Fits: BMW E46 M3, '01-'06

Direct bolt-in replacement to stock, cracked or discolored tanks
Fabricated Aluminum for strength, factory tanks fail after repeated high heat situations
No cutting of factory hoses is required and accepts the factory clip-on hose
Included is a Moroso Part No. 63324 racing radiator cap that operates in the same pressure range as the factory cap
The Moroso radiator cap mounts to a billet aluminum neck that will not strip out like plastic threaded necks
Easy to read slight level is included

Moroso

Moroso Coolant Expansion Tank - BMW E46 M3