The 2018 Honda Civic Si takes 0W-20 synthetic motor oil. This viscosity and type are Honda’s recommended standard for the turbocharged 1.5-liter engine to balance performance, protection, and fuel economy.
Oil specifications for the 2018 Civic Si
Before you buy oil, know the official specs that Honda calls for in this model. The following details cover viscosity, type, and compatibility to keep the engine properly lubricated.
Why 0W-20 matters
0W-20 provides strong cold-start protection and helps maximize fuel efficiency in turbocharged engines like the Civic Si, while meeting Honda’s required performance standards.
- Viscosity: 0W-20
- Oil type: Full synthetic motor oil
- Specifications: API SN or newer; ILSAC GF-5 or GF-6
- Capacity (including filter): Approximately 3.4 quarts (3.2 liters)
- Manufacturer guidance: Honda Genuine or any brand that meets the 0W-20 specification and Honda’s API/ILSAC requirements
Always verify with the owner's manual or the information label under the hood, as exact figures can vary slightly by market or model revision.
Practical guidance for sourcing and changing oil
Here are practical steps and tips to ensure you select the right oil and perform a change correctly. This list helps you translate the specs into everyday shopping and maintenance actions.
- Confirm the oil grade is 0W-20 and labeled as full synthetic.
- Choose an oil that meets API SN or newer and ILSAC GF-5 or GF-6; avoid non-certified oils for this engine.
- Replace the oil filter at every change and clean the drain plug as needed.
- Bring the total to roughly 3.4 quarts (3.2 liters) of oil when refilling, then recheck with the dipstick after the engine has run and settled.
- Discard old oil at a proper recycling facility and reset the maintenance minder as instructed in the manual.
Following these steps helps maintain optimal engine protection and performance, while ensuring that you stay within Honda’s recommended guidelines for the Civic Si.
Summary
The 2018 Honda Civic Si requires 0W-20 synthetic motor oil, meeting API SN or newer and ILSAC GF-5 or GF-6 specifications. Use full synthetic oil, replace the filter, and refill to around 3.4 quarts. Always consult your manual for exact specs and intervals, and use Honda’s maintenance minder to guide service timing.
What are the most common civic repairs?
In a nutshell: The Honda Civic is generally a very reliable family car, with newer models performing especially well in owner surveys. Common problems include brake wear, minor electrical faults and, on some 2017-2022 1.0 VTEC Turbo models, wet belt-related engine issues that can become expensive if ignored.
What kind of oil does a 2018 Honda Civic take?
0W-20 full synthetic oil
Honda recommends using 0W-20 full synthetic oil for the 2018 Civic Type R.
How fast can a Honda go?
The 2025 Honda Civic top speed is reported to be 114 miles per hour for the Civic Sport Touring Hybrid. In 2023, the top reported speed of the Honda Civic Type R was 169 miles per hour. Type R options generally provide the best performance for the lineup.
What kind of oil does a 2018 Honda Civic SI use?
synthetic 0W-20
Whether you've just bought a new Civic or have been driving one for a while, you may wonder, “What oil does a Honda Civic take?” Your Honda Civic requires synthetic 0W-20 rated oil, the standard choice for optimal engine health and improved overall performance.