How much transmission fluid does a 2018 Honda Civic take?

2.3 quarts as a total fill for the SDEM transmission (2.3 to 8 quarts across this year's engines). A drain-and-refill without removing the pan replaces roughly a third to half of that, so refill to the level check point rather than pouring in the whole figure.

What transmission fluid does a 2018 Honda Civic use?

The source lists only a catalog code for this year, not the OEM specification, so use the fluid named in your owner's manual or on the dipstick.

What brake fluid does a 2018 Honda Civic take?

DOT 3, per the manufacturer note. It is also printed on the brake fluid reservoir cap.

2018 Honda Civic transmission fluid capacity and fluid specs

GarageDex's fluid data shows the 2018 Honda Civic (K20C1 2L 4-cylinder FC-FK) uses the SDEM manual transmission, which holds 2.3 quarts of fluid as a total fill. Other engines on this year hold 2.3 to 8 quarts - see the table. Brake fluid is DOT 3.

Shop transmission fluid Match the specification on the bottle to your manual

Key takeaways

Transmission: SDEM manual transmission, 2.3 qt total fill.
Total fill is the whole system; a drain-and-refill takes a third to half.
Brake fluid: DOT 3.
Fluid specification is not named by the source - use the owner's manual.

2018 Honda Civic fluids by engine
Engine	Transmission	Total fill	Fluid spec	Brake fluid	Gear oil
K20C1 2L 4-cylinder FC-FK	SDEM manual	2.3 qt	per owner's manual	DOT 3	-
K20C2 2L 4-cylinder FC-FK	JDJC automatic	6.1 qt	per owner's manual	DOT 3	-
L15B7 1.5L 4-cylinder FC-FK	BCGA automatic	8 qt	per owner's manual	DOT 3	-
L15BA 1.5L 4-cylinder FC-FK	MCKA automatic	8 qt	per owner's manual	DOT 3	-

Fluids for the 2018 Honda Civic

Buy fluid that states the specification your manual names. Multi-vehicle fluids list the specs they meet on the back label - if yours is not listed, it is the wrong bottle.

Transmission fluidYou need about 3 quarts for a full fillShop fluid DOT 3 brake fluidA quart covers a full flushShop brake fluid Fluid transfer pumpMost modern transmissions have no dipstick tube - you fill from belowShop pumps

As an Amazon Associate we earn from qualifying purchases, at no extra cost to you.

Other 2018 Honda Civic specs

All specs Engine oil Coolant capacity Maintenance schedule

Other Civic years

2026 2025 2024 2023 2022 2021 2020 2017 2016 2015 2014 2013 2012 2011 2010 2009 2008 2007 2006 2005

Source: World's Best Oil (AMSOIL dealer cross-reference). Capacities are total system fills; a drain-and-refill takes less. Where no fluid specification is shown, the source lists only a catalog code, so use the specification printed in your owner's manual - the wrong transmission fluid damages a transmission.