The K20A2 engine is designed to rev freely, and using anything thicker than 5W-20 can result in sluggish response and reduced fuel economy. Conventional Oil While the 5W-20 specification is clear, drivers often debate between synthetic and conventional oil.
2007 Honda Civic Si Oil Brands Compared: 5W-20 Synthetic vs. Conventional
Recommended Oil Specifications for the K20A2 Engine The heart of the 2007 Civic Si is the K20A2 2. Why 5W-20 Viscosity? Honda engineers selected 5W-20 for its optimal balance of protection and efficiency.
The ideal oil type is a 5W-20 viscosity, meeting the ILSAC GF-4 or API SL certification standards. 0 Quarts Filter Size Standard (approximately 10 inches) Torque Spec 18 - 22 lb/ft (Always replace the drain washer) Performance and Longevity Adhering to the correct oil type directly impacts the driving dynamics that made the Civic Si a legend.
2007 Honda Civic Si Oil Brands Compared: 5W-20 Synthetic vs Conventional
The "20" rating provides the proper thickness for the high-stress conditions within the valvetrain and bottom end, which the Si's aggressive camshaft profile generates. Look for a 5W-20 oil that meets the ILSAC GF-4 standard, and change the interval regularly.
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