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I assume that you're interested in learning about the recommended engine oil for the 2012 Honda Civic Si, specifically for the engine and not for the differential. The ideal choice here would be a synthetic SAE 0W-20 oil. While it may be a bit pricier, opting for this type of oil not only allows you to go longer between oil changes but also helps maintain the engine seals and keep the moving parts clean. This Civic requires 3.9 quarts of oil if you're also changing the filter at the same time, which you should always do. When tightening the oil drain plug, do not exceed 20 pound feet of torque to avoid stripping it and potentially needing to replace the pan.
The 2012 Honda Civic Si requires SAE 0W-20 oil for optimal performance.