E46 323i/325i/328i/330i Aluminum Expansion Tank by Moroso

Prevent catastrophy by replacing your aged, fragile plastic tank with a high-quality, long-lasting aluminum tank

+ -
+ -
+ -
+ -
+ -
+ -
+ -
+ -



Our Aluminum Expansion Tanks for the E46 323i 323Ci 325i 325Ci 328i 328Ci 330i and 330Ci completely solves a common problem with the factory E46 expansion tanks. The stock plastic expansion tank gets brittle over time and eventually fails. When this occurs, you dump a lot of coolant, and that can cause a whole list of problems.  

It's not just the original BMW expansion tank that fails, either. Any OEM-style tank is going to suffer from the same shortcomings and failures as the original. Made from plastic, they do nothing to resolve the underlying issues and you are only inviting another inconvenient failure at some unknown point down the line. Beyond the usual mess when coolant is dumped on the ground, the E46 is extra special: when the plastic tank fails, it's usually somewhat spectacular. The released pressure often takes out your hood - an impressively devastating feat.

Before it fails, replace your old plastic unit with this beautifully-made, high-quality aluminum piece from Moroso. The Moroso expansion tank for the E46 non-M is a premium, race-quality reservoir. The expansion tank drops in like an OE reservoir. This tank also includes a two bar reservoir cap.

To learn more about Moroso expansion caps and cooling system pressures, check out this video:

Note: Tank does not have a provision for OE level sensor - dash warning light must be turned off by shorting two wires going to the level sensor plug.

Made in USA

BMW Fitments:

3 Series
E46 (99-05) > 323Ci
E46 (99-05) > 323i
E46 (99-05) > 325Ci
E46 (99-05) > 325i
E46 (99-05) > 325xi
E46 (99-05) > 328Ci
E46 (99-05) > 328i
E46 (99-05) > 330Ci
E46 (99-05) > 330i
E46 (99-05) > 330xi
Recently Viewed Products

What customers are saying...

  • I am extremely pleased with this order. The price was competitive and your expedited delivery charge was surprisingly low. I needed the part fast and you exceeded my expectations. I especially appreciate your gentleman who over the phone ensured me that the part was indeed in stock and would be shipped immediately.
    - Allan Read More
  • I’ve never dealt with a true “race” shop like BW and I really have enjoyed the experience. I always feel like I’m getting the best advice, and suggestions for true race car set up. Your technical expertise on even the minute details of building race cars is really impressive, and some I value greatly...
    - Paul Read More
  • I just can't express enough how impressed I am with you guys. Thanks so much for the great service from start to finish, and always done with a smile and as professional as possible. Our particular interaction has extended over many months and never have I felt that I wasn't getting first-class service...
    - Chris Read More
  • I just wanted to say what positive experiences I've had over the past few weeks. Your BimmerWorld sales staff have gone above and beyond to help me out, between their service and taking the time to answer all my questions, I'll be buying my parts from BimmerWorld whenever possible...
    - Aaron Read More