Mishimoto Expansion Tank Black 2019+ Ram 6.7L Cummins

The Mishimoto expansion tank replaces the factory expansion tank on 2019+ Ram 6.7L Cummins trucks, improving cooling-system reliability by eliminating the brittle plastic OEM unit that is prone to cracking and internal degradation after thousands of heat cycles.

Designed by Mishimoto, this replacement tank addresses common failure modes of the stock component: plastic embrittlement, discoloration, and loss of internal integrity. The Mishimoto tank uses aluminum construction to provide a more durable, long-term solution that reduces the risk of coolant loss and heat-cycle related failures.

Key technical features and why they matter

• Aluminum construction — Offers greater resistance to cracking and degradation versus the stock plastic tank, improving long-term reliability under repeated thermal cycling.
• Black finish — Resists visual discoloration that commonly affects plastic OEM tanks and maintains a clean, serviceable appearance over time.
• Direct replacement for 2019+ Ram 6.7L Cummins — Fits the intended vehicle application to restore proper coolant containment and system function without modification.

Value and performance notes: this Mishimoto expansion tank focuses on durability and long-term service life in heavy-duty and high-use applications where the factory plastic tank is a known weak point. By addressing material failure modes, the tank contributes to consistent coolant retention and reduces the likelihood of coolant-related downtime.

Vendor: Mishimoto