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RX8 OEM Plastic Expansion Tank Warning!

Every RX8's OEM plastic coolant expansion tank is a ticking time bomb. Over time, the weak plastic neck deforms from heat and pressure, reducing the force holding the cap down. This can cause coolant to escape well before the cap's rated pressure is reached. Once coolant is lost, temperatures typically get higher and higher, causing even more coolant loss until finally the engine begins to overheat.

Pettit's Aluminum Coolant Tank will never fail, and it fits all RX8 models from 2003 thru 2012. Use as a direct OEM expansion tank replacement or upgrade to a more efficient closed system. We offer 3 kits to suit all your RX8 upgrade needs:

  • AST Spec. A Kit RX8— Our most comprehensive kit lets you setup a closed cooling system by combining our recovery reservoir with our aluminum tank. In this configuration the aluminum tank works as an Air Separator Tank (AST), reducing entrained air in the system. This kit also features a low level sensor to signal the RX8 dash warning light for low coolant.
  • AST Spec. B Kit RX8— This kit lets you setup a closed system by combining our recovery reservoir with our aluminum tank. In this configuration our aluminum tank works as an Air Separator Tank (AST), reducing entrained air in the system.
  • Aluminum Expansion Tank Spec. C Kit RX8— In its simplest configuration, our aluminum coolant tank can be used as an OEM replacement for the original plastic expansion tank, only much stronger!

Overheating is the most common cause of rotary engine failure... don't let this happen to you!