The 2018 Kia Optima with the 2.4-liter engine typically holds about 5.0 quarts of engine oil when performing a full drain and fill with a new filter.
In practice, the 2.4L Nu engine used in many Optima models lists an oil capacity of 5.0 quarts with the oil filter change. This figure represents a standard oil change procedure; if you skip changing the filter or perform a partial drain, the amount added may be slightly less. Always confirm the exact specification for your vehicle from the owner's manual or the under-hood information label, as regional variations can occur.
Understanding the specification
Oil capacity refers to the total amount of oil needed to fill the engine to the proper level during a complete drain and refill with a new filter. The 2018 Optima's 2.4L engine is designed around a 5.0-quart capacity when the filter is replaced, which is the common guideline used by service technicians and manuals.
How to verify for your vehicle
Where to find the official figure
Consult the 2018 Optima owner's manual, the maintenance section, or the dealer’s service bulletin for the exact capacity for your market. The under-hood label sometimes repeats the oil capacity and grade requirements as well.
Practical steps during an oil change
During a standard drain-and-fill with a new filter, plan to add roughly 5 quarts of oil, then start the engine and check for leaks. Stop the engine after a moment, recheck the dipstick, and top up as needed to reach the full mark.
Notes on oil grade and service intervals
While this article focuses on capacity, use the oil grade recommended by Kia for the 2.4L engine and adhere to the maintenance schedule. Using the correct grade ensures proper lubrication and performance, especially under varying climate conditions.
Summary
For the 2018 Kia Optima with the 2.4L engine, the standard oil capacity is about 5.0 quarts when performing a full drain and refill with a new filter. Always verify against your owner's manual or dealership resources for the exact specification applicable to your vehicle’s market and production date, and use a dipstick check to confirm the final level after topping up.