Aluminum Coolant Expansion Reservoir Overflow Tank with Cap Compatible with Nissan 350Z 2006-2009 3.5L 21710-EV00B Black

What This Tank Actually Does

The coolant expansion reservoir manages excess coolant as engine temperatures rise and fall. When the stock plastic tank fails (and it will), you get leaks, overheating, and that lovely burnt-coolant smell. This aluminum unit solves that problem permanently instead of pretending it won’t happen again.

Key Features

• Full aluminum construction (no plastic, no cracking)

• Black anodized finish for clean engine bay aesthetics

• Direct OEM replacement for part 21710-EV00B

• Includes matching pressure cap

• OEM-style hose locations and mounting points

• Designed for high heat and daily driving abuse

In other words: install it once and stop thinking about it forever.

Vehicle Compatibility

• Nissan 350Z – 2006–2009

• Engine: 3.5L V6 (VQ35HR)

• Fits factory mounting locations

⚠️ Always confirm engine and year—early Zs used different reservoir designs because Nissan loves inconsistency.

Why Upgrade to Aluminum?

Plastic coolant tanks degrade from heat cycles and pressure over time. Aluminum tanks:

• Handle higher temps

• Don’t discolor or crack

• Improve long-term reliability

• Look significantly better (because engine bays matter)

Final Verdict

If you own a 2006–2009 Nissan 350Z, this aluminum coolant expansion tank is one of those rare upgrades that’s cheap insurance. It replaces a known failure point, improves reliability, and adds a clean OEM+ look—without turning your car into a science fair project.