What kind of gas does an Acura RSX take?
The Acura RSX runs on premium unleaded gasoline with an octane rating of 91 or higher. Using regular 87-octane fuel can cause knocking and reduce performance.
Fuel type and octane requirements
The RSX was offered in two trims, Base (K20A3) and Type-S (K20A2). Both engines are designed for premium gasoline, and Acura’s manuals specify a minimum octane of 91 for optimal performance. In North America, many owners run 93 octane for maximum responsiveness.
- RSX Base (K20A3): Premium unleaded gasoline, 91 octane minimum (AKI).
- RSX Type-S (K20A2): Premium unleaded gasoline, 91 octane minimum (AKI).
Note: Octane measurements differ by region (AKI in the United States, RON/MON in other markets); always check the fuel label or owner's manual for your specific market.
Ethanol content and fuel compatibility
The RSX generally accepts gasoline containing up to 10% ethanol (E10) across most model years. Higher ethanol blends (such as E15 or E85) are not recommended unless specifically approved for your market and year.
- E10 is commonly supported in North America.
- Higher ethanol blends are typically not recommended for the RSX.
Always verify with your exact model year and regional manual, as ethanol allowances can vary.
Practical fueling tips
To maintain performance and fuel system health, keep these tips in mind when fueling your RSX:
- Use premium unleaded gasoline with 91 octane or higher (typical North American premium is 93).
- Stick to fuel with ethanol content within the manufacturer’s guidance (usually E10).
- Choose fuel from reputable stations to minimize contaminants and moisture.
When in doubt, consult your specific vehicle’s owner’s manual or the fuel-filler door label for the exact requirements for your RSX’s model year and region.
Summary
The Acura RSX requires premium unleaded gasoline with an octane rating of 91 or higher, for both the Base and Type-S models. In most markets, this equates to 93 octane in practice. The car generally supports E10 ethanol but should not use higher ethanol blends unless explicitly approved. Always verify the exact fuel specifications in your owner’s manual or on the fuel door sticker.
