Still running the factory expansion tank on your E46 M3? 👀 The OEM plastic expansion tank is one of the most failure-prone parts of the E46 M3 cooling system. Repeated heat cycles make the plastic brittle over time, leading to cracks, coolant leaks, and potential overheating. If yours hasn’t failed yet, well it’s only a matter of time. Turner Motorsport has developed the ultimate solution: a Heavy Duty Aluminum Expansion Tank designed specifically for the E46 M3. Constructed from TIG-welded 5052 aluminum, this tank is built to withstand extreme temperatures and pressure without degrading like the factory plastic. Whether you’re driving daily or pushing your M3 on the track, Turner’s aluminum tank offers unmatched durability and long-term peace of mind. No more cracks. No more coolant leaks. No more worrying. Search ES4876067 at ECS Tuning and make the upgrade today. This is one cooling system failure you can eliminate for good! #ECSTuning #TurnerMotorsport #BMW #E46M3 #BMWM #M3 ...