The transmission fluid type depends on which transmission your 2018 Civic has. If it’s the CVT, you’ll need Honda CVT Fluid HCF-2; if it’s a 6-speed manual, you’ll need Honda Manual Transmission Fluid (MTF).
Transmission options in the 2018 Civic
Continuously variable transmission (CVT)
The CVT used in most 2018 Civics requires a specific CVT fluid designed for belt-driven transmissions. Using the wrong fluid can cause reduced performance or transmission damage. Always use the fluid specified by Honda for CVTs.
- Fluid type: Honda CVT Fluid HCF-2 (Honda Genuine CVTF).
- Compatibility: Use only HCF-2 CVTF; avoid ATF types such as Dexron II/III or Mercon, and do not mix fluids.
- Availability: Available at Honda dealerships, authorized service centers, or automotive retailers that stock Honda CVTF HCF-2.
- Service note: Follow the owner's manual for service intervals and procedures; some Civics require CVT fluid replacement at set mileage or time intervals.
In summary, if your Civic has the CVT, Honda CVT Fluid HCF-2 is the correct choice and should be used per Honda's guidelines.
Six-speed manual transmission
For the 6-speed manual transmission, Honda specifies a dedicated manual transmission fluid. This fluid is designed specifically for manual gearboxes and should not be replaced with automatic transmission fluid.
- Fluid type: Honda Manual Transmission Fluid (MTF) or an equivalent meeting Honda's MTF specification (GL-4 compatible).
- Viscosity note: Check the owner's manual for the recommended viscosity; many Honda manuals specify around 75W-90, but the exact grade can vary by model year.
- Avoidance: Do not use automatic transmission fluid or CVT fluid in the manual transmission.
- Replacement guidance: Use the recommended MTF and consult the owner's manual for service intervals or consult a Honda service professional.
For CVT-equipped Civics, the specified CVTF is essential; for 6MT Civics, use Honda MTF as directed in the manual.
Summary
- 2018 Civic with CVT: Honda CVT Fluid HCF-2 (Honda Genuine CVTF).
- 2018 Civic with 6-speed manual: Honda Manual Transmission Fluid (MTF), GL-4 compatible; check the owner's manual for the exact viscosity.
- Avoid mixing fluids; always use fluids specified by Honda for each transmission type.
Vehicle maintenance can change with model details and VIN, so always verify with the owner's manual or a Honda dealer for the exact fluid specification for your car.