Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2018 Kia OptimaOil Type & Capacity
OEM spec from the factory service manual for the Hybrid EX, 2.0L Eng VIN C variant.
Quick Answer
Oil Type
$API SM or above, ILSAC GF-4 or above, ACEA-A5 or above, SAE 5W-20, 5W-30
Capacity (w/ Filter)
4.33 QTS.
4.09 L
Variant
Hybrid EX, 2.0L Eng VIN C
Note: If the ACEA A5 engine oil is not available in your country, you are able to use API SM or above, ILSAC Gf-4 or above, ACEA A3.
This vehicle's factory manual
2018 Kia Optima: confirm the engine, trim, or drivetrain to open the available repair and diagnosis sections.
Sister site: See this spec on WhatTypeOfOil.com — our quick oil type & capacity lookup for every vehicle.
Other specs:All specs
What You'll Need
Related for Your 2018 Kia Optima
Quick Actions
Frequently Asked Questions
- What type of oil does a 2018 Kia Optima take?
- The 2018 Kia Optima requires API SM or above, ILSAC GF-4 or above, ACEA-A5 or above, SAE 5W-20, 5W-30. The exact spec may vary slightly by engine variant — this page shows the OEM recommendation for the Hybrid EX, 2.0L Eng VIN C configuration.
- How much oil does a 2018 Kia Optima need?
- The 2018 Kia Optima takes 4.33 QTS. (4.09 L) of engine oil with the filter replaced.
- Can I use synthetic oil in my 2018 Kia Optima?
- Yes — synthetic oil that meets the API SM or above, ILSAC GF-4 or above, ACEA-A5 or above, SAE 5W-20, 5W-30 specification is acceptable and often preferred for better protection and longer change intervals.
- What happens if I use the wrong oil in my 2018 Kia Optima?
- Using oil that does not meet the API SM or above, ILSAC GF-4 or above, ACEA-A5 or above, SAE 5W-20, 5W-30 specification can reduce engine protection, increase wear, and potentially void warranty coverage. Always use oil that meets the OEM spec.