Typically about 5 quarts (approximately 4.7 liters) of engine oil are required for a full oil change on most 2.4 L Kia Optima engines with a new filter. If you do not replace the filter, the total may be lower. Confirm exact capacity in the owner's manual for your model year.
What you need to know about capacity
Understanding the numbers helps you plan your oil change without over- or under-sizing. The 2.4-liter Optima often uses a single standard capacity, but slight differences can occur between model years and revisions of the Theta II engine.
Here are the typical figures you’ll encounter when performing an oil change on a 2.4L Optima:
- With the oil filter replaced: 5.0 quarts (4.7 liters)
- Without replacing the filter (top-up or non-filter change): around 4.5–4.8 quarts (4.3–4.5 liters)
As a general rule, aim to fill to the dipstick’s full mark after an oil change and new filter installation. If the dipstick shows a lower level, add oil gradually and recheck to avoid overfilling.
Oil type and change reminders
The correct viscosity and oil type can vary by year and climate. Kia's manuals typically recommend a 5W-20 or 5W-30 grade, with 5W-20 being common in newer models and milder climates, and 5W-30 in hotter climates or for severe-service conditions. Always use the grade specified on the oil fill cap or in the owner's manual.
Use a properly rated oil filter and ensure all hardware is tightened to spec. If your vehicle uses a maintenance reminder, reset it after completing the oil change.
How to check oil level and complete a change
Before changing or checking the oil level, make sure the engine is off and cool, the car is on level ground, and you have the recommended oil and filter on hand.
- Warm the engine briefly, then turn it off and wait a few minutes to let the oil settle.
- Remove the dipstick, wipe clean, reinsert, and pull it out again to check the level against the marks.
- If the level is low, add the recommended oil gradually, rechecking as you go to avoid overfilling.
- Replace the oil filter with a new one if performing a full service.
- Run the engine for a minute, recheck the level, and top off if needed. Check for leaks and reset the service indicator if applicable.
Following these steps ensures the engine operates with the correct oil volume and pressure, supporting smooth operation and lifespan.
Summary
For a typical 2.4L Kia Optima, plan for about 5 quarts (4.7 liters) of motor oil during a full change with a new filter. Exact capacity can vary slightly by year and configuration, so always consult the owner's manual or dealership data for your specific vehicle. Regular oil changes with the correct grade keep the Theta II 2.4L engine running cleanly and efficiently.