Your cart

GENUINE MAZDA OEM Radiator Sub-Tank (Revision C) for Mazda RX8 (Series 1 & 2, 2003-2012)

Genuine Mazda radiator sub-tank and cap replace an ageing RX8 overflow bottle, restoring secure coolant containment with factory-correct fit.

Mazda RX8 radiator sub tank front view with hose and electrical connector

$250

Mazda RX8 radiator sub tank Revision C is a new genuine coolant overflow reservoir and cap for Series 1 and Series 2 models. It replaces an ageing plastic bottle exposed to repeated heat cycles, giving owners a factory-correct, known-condition cooling-system refresh. The supplied cap means both pieces can be renewed together.

Mazda RX8 Radiator Sub Tank Details

  • The supplied new OEM cap completes the reservoir replacement rather than leaving an older cap in service.
  • Revision C provides a fresh replacement for a plastic tank that may become cloudy, worn or cracked with age.
  • Direct replacement fitment suits Mazda RX8 Series 1 and Series 2 applications.
  • A new genuine component provides known-condition assurance over a used reservoir with unknown age or cooling-system history.
  • The tank manages coolant overflow, making its condition relevant to routine maintenance and visual cooling-system checks.

For rotary enthusiasts, this RX8 coolant expansion tank removes uncertainty around an ageing reservoir and cap. A genuine RX8 radiator sub tank is a sensible preventative replacement when the original bottle looks tired. Replacing the reservoir and cap together avoids retaining an older cap beside a fresh tank. Owners checking an N3H115350M Mazda tank reference can identify this factory replacement option.

Pair this Mazda RX8 radiator sub tank with the GENUINE MAZDA OEM Radiator Hose Replacement Set when refreshing older cooling components. The GENUINE MAZDA OEM Thermostat retains Mazda’s intended operating temperature. Review current ownership information through the official Mazda Australia website.

Additional information

RX8 Model

,

SKU OM-RTC-S1S2 Categories , Types , Brand:

Related RX8 Upgrades

This radiator sub-tank is one of the best Mazda RX-8 upgrades you can make to your Series 1 (2003-2008) or Series 2 (2009-2012). Cooling system replacements are among the top OEM mods you can buy from MAZDA for owners who want better performance and reliability from their RX8. If you are looking for rx8 radiator sub-tank for sale in Brisbane (QLD), Sydney (NSW), Melbourne (VIC), Canberra (ACT), Adelaide (SA), Darwin (NT) or Perth (WA), you’ll find high-quality Japanese Cooling upgrades at RX8 Upgrades.

Frequently Asked Questions

Does this genuine Mazda radiator sub-tank fit both Series 1 and Series 2 RX8 models?

This genuine Mazda RX8 radiator sub-tank is a direct replacement for Series 1 models from 2003-2008 and Series 2 models from 2009-2012.

Is a radiator cap included with this RX8 radiator sub-tank?

Yes. This genuine Mazda RX8 radiator sub-tank is supplied with a new OEM radiator cap for a more complete coolant reservoir replacement.

What is Revision C on the RX8 radiator sub-tank?

Revision C is the specified design revision of this genuine Mazda RX8 radiator sub-tank. It is intended to reduce the cracking risk associated with an ageing plastic tank exposed to repeated heat cycles.

When should I replace the coolant overflow bottle on my RX8?

Replace the RX8 radiator sub-tank if the existing reservoir is cloudy, worn or cracked. As the tank is part of the coolant overflow system, renewing an ageing unit can remove uncertainty around its condition and cap.

Why choose a new genuine Mazda sub-tank instead of a used one?

A new genuine Mazda RX8 radiator sub-tank provides a known-condition replacement, unlike a used tank with unknown age, heat-cycle exposure or service history. It also offers factory-correct fitment.

Is this part the coolant overflow tank for an RX8?

Yes. The genuine Mazda RX8 radiator sub-tank serves as the coolant overflow reservoir, also commonly called the coolant expansion tank or overflow bottle.