PRODUCT DETAILS
Honda FK8 / FL5 / DE5 Coolant Expansion Tank – Genuine OEM Replacement
This Honda FK8 / FL5 / DE5 coolant expansion tank, part number 19101-5BF-G01, is a genuine Type R OEM expansion tank. It’s the same OEM coolant tank your car came with, and it handles coolant expansion and recovery so your temps stay consistent when you’re in boost, on track, or stuck in traffic.
On Civic Type R (FK8 / FL5) and Integra Type S (DE5) cars, the stock plastic tank is shown to leak over time, engine bay heat, pressure, and years of heat cycles all add up, and the reservoir eventually starts to yellow, spider-crack, or leak. If your coolant reservoir is sweating coolant, you’re one step away from an overheat and possible engine damage. Yes, there are aftermarket aluminum FK8 coolant expansion tank options such as the Mishimoto or PRL units, but they’re usually far more expensive than just dropping in a fresh genuine Honda tank. This factory cooling system tank keeps the original look, proven reliability, and saves you cash for tires and track days.
Key Features
- Genuine Honda Type R OEM expansion tank – part number 19101-5BF-G01
- Direct bolt-in coolant tank, OEM fitment for FK8, FL5, and DE5 chassis
- Restores proper coolant expansion, recovery, and system pressure control
- More affordable than most aftermarket aluminum tanks
- Best choice when your original FK8 / FL5 / DE5 reservoir is cracked, leaking, or discolored
Vehicle Fitment
- 2017–2021 Honda Civic Type R (FK8 coolant expansion tank)
- 2023+ Honda Civic Type R (FL5 coolant tank replacement)
- 2024+ Acura Integra Type S (DE5 cooling system tank)
If your Honda FK8 / FL5 coolant tank or Acura Integra Type S coolant reservoir is seeping, cracked, or you just don’t trust the plastic anymore, this 19101-5BF-G01 tank gives you genuine Honda fitment and reliability at a much lower cost than most aftermarket options. Swap it in, bleed the system, and your Type R OEM expansion tank is one less thing to worry about when you’re flat out.