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Factory oil specification for the 2020–2025 Honda Civic.
Honda's Maintenance Minder shows oil life as a percentage; change the oil when it reaches 15% or lower. Iridium spark plugs last about 100,000 miles.
The first number (0W or 5W) is how the oil flows when cold — lower is better for cold starts. The second number (20 or 30) is how thick it stays when the engine is hot. "Full synthetic" is made in a lab, not refined from crude, so it lasts longer and protects better at high temperatures. Always use the viscosity your manual calls for — thicker is not better.
Change the oil at the interval above, or once a year if you drive less. If you tow, drive in extreme heat, or do lots of short trips, change it sooner.
