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 Optima Plug-In Hybrid EXFACTORY OEM SERVICE PROCEDURE
Quick Lookups: Fluids
| FLUID CAPACITIES | |||||||
|---|---|---|---|---|---|---|---|
| Fluid Type | Application | Standard | Metric | Fluid Spec | Note | S/H | |
| Air Cond Refrigerant | 1.31 LBS. | 0.59 KG | R-1234yf | S | |||
| Automatic Transmission Fluid | 2.0L Eng,Gas/Electric | 6.34 QTS. | 5.99 L | MICHANG ATF SP-IV, SK ATF SP-IV, NOCA ATF SP-IV, KIA genuine ATF SP-IV or other brands meeting the GL-4 specification approved by Kia Motors Corp | S | ||
| Brake Fluid | 0.47 QTS. | 0.44 L | FMVSS116 DOT 3 or DOT 4 Brake Fluid | S | |||
| Engine Coolant | 2.0L Eng,Gas/Electric | Engine Cooling System | 7.12 QTS. | 6.73 L | 50/50 mixture of Ethylene Glycol Antifreeze and water | S | |
| Engine Coolant | 2.0L Eng,Gas/Electric | Inverter Coolant | 3.30 QTS. | 3.12 L | 50/50 mixture of Ethylene Glycol Antifreeze and water | S | |
| Engine Oil | 2.0L Eng,Gas/Electric | 4.33 QTS. | 4.09 L | API SM or above, ILSAC GF-4 or above, ACEA-A5 or above, SAE 5W-20, 5W-30 | 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. | S | |
| Fuel Tank | Plug-In Hybrid EX | 14.52 GALS. | 54.96 L | S | |||
| Windshield Washer Fluid | N/A | N/A | S | ||||
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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