The 2018 Honda Civic Si requires about 3.4 quarts (roughly 3.2 liters) of 0W-20 synthetic oil, including the filter, for a full oil change. After adding oil, run the engine a few minutes and recheck with the dipstick to ensure the level is correct.
Oil type and total capacity
To protect the engine, use Honda-approved synthetic oil and follow the manufacturer’s specification for viscosity. The Civic Si’s engine calls for 0W-20 full synthetic oil, and the total capacity when replacing the oil and filter is about 3.4 quarts (3.2 liters). Always verify the level after an oil change and before driving long distances.
Before beginning any oil service, consider these essential details to ensure an accurate fill and proper engine protection.
- Oil grade: 0W-20 synthetic oil (Honda-approved or equivalent meeting API SN Plus/ILSAC GF-5 standards).
- Capacity: 3.4 quarts (3.2 liters) with the oil filter included in the change.
- Oil filter: Replace the filter at every oil change to maintain proper oil flow and filtration.
- Verification: After adding oil, run the engine briefly and recheck the level with the dipstick to avoid overfill.
In practice, following these guidelines helps ensure the Civic Si receives the correct amount and quality of oil for optimal performance and longevity.
Practical steps for a DIY oil change
If you’re performing an oil change yourself, follow a structured process to achieve the 3.4-quart target safely and accurately.
- Warm up the engine briefly, then turn it off and secure the vehicle on a level surface.
- Drain the old oil completely from the oil pan and remove the old filter.
- Install a new oil filter and tighten to the manufacturer’s torque specification.
- Pour in a total of about 3.4 quarts of 0W-20 synthetic oil, pausing to check the level with the dipstick as you approach the full mark.
- Start the engine, run for a minute, and turn off again to recheck the oil level, topping up as needed.
- Dispose of the used oil and filter at an appropriate collection point.
By adhering to these steps and the specified oil type and quantity, you’ll maintain proper lubrication and engine health for your 2018 Civic Si.
Maintenance reminders and context
Oil-change intervals for the Civic Si are guided by Honda’s maintenance minder system and your driving conditions. In typical use, intervals often fall around every 7,500 miles under normal conditions, but severe conditions (short trips, heavy loads, or extreme temperatures) may require more frequent changes. Always consult the owner’s manual or a Honda service professional for the most accurate schedule for your vehicle.
Summary: The 2018 Honda Civic Si uses 0W-20 synthetic oil, with a total oil capacity of about 3.4 quarts (3.2 liters) when changing the oil and filter. Use the correct oil grade, replace the filter at every change, and verify the level after completion to ensure proper lubrication and performance.
Bottom line
For the 2018 Civic Si, plan for roughly 3.4 quarts of 0W-20 synthetic oil per oil-change, including the new filter, and rely on the dipstick to confirm an accurate fill after servicing.