The oil filter number depends on which engine your 2011 Optima uses. The two most common OEM numbers are 26300-35501 for the 2.4-liter engine and 26360-35501 for the 2.0-liter turbo.
Engine options in the 2011 Optima
In 2011, Kia offered two main engines in the Optima sold in many markets: a 2.4-liter Nu inline-four and a 2.0-liter turbocharged Theta II. The filter you need is tied to the engine code rather than the trim level.
Oil filter part numbers by engine
The following list provides the typical OEM oil filter numbers associated with these engines. If your car’s market differs, verify with the VIN or dealer to be certain.
- 2.4L Nu engine (non-turbo): OEM oil filter part number 26300-35501.
- 2.0L Turbo engine (Theta II): OEM oil filter part number 26360-35501.
Because engine configurations can vary by region and model year, always confirm the exact filter using your engine code or VIN. If in doubt, consult a Kia dealer or trusted parts supplier with your VIN.
How to identify your engine code
To ensure you order the correct oil filter, confirm which engine is installed in your Optima by locating the engine code. This code maps directly to the corresponding filter number.
Common references to look for include the engine code stamped on the engine block or listed on the vehicle’s VIN. In North America, the two main possibilities for the 2011 Optima are the 2.4L Nu and the 2.0L Turbo Theta II.
- Find the engine code stamped on the engine block or near the valve cover (examples: Nu 2.4, Theta II 2.0T).
- Check the VIN plate on the dashboard or door jamb and use Kia’s official resources or a reliable VIN decoder to identify the engine option.
- Consult the owner’s manual, service records, or contact a dealer with your VIN to confirm the exact engine and corresponding oil filter part number.
Knowing the correct engine code will prevent ordering the wrong filter and ensure proper fit and performance.
Summary
For a 2011 Kia Optima, the oil filter number is engine-dependent: 26300-35501 for the 2.4L Nu engine and 26360-35501 for the 2.0L turbo Theta II. Always verify with your VIN or engine code to ensure you purchase the correct filter, and consult your dealer or parts supplier if you’re unsure.