Engine oil viscosity (thickness) has an effect on fuel economy and cold weather operation (starting and oil flow). Lower-viscosity engine oils can provide better fuel economy and cold-weather performance. However, higher-viscosity engine oils are required for satisfactory lubrication in hot weather. Using oils of any viscosity other than those recommended could result in engine damage.
When choosing an oil, consider the range of temperature your vehicle will be operated in before the next oil change.
2001 2002 2003 2004 2005 2006 Kia Optima Engine Oil Capacity
| Engine type | Engine Oil Capacity with filter | Oil type |
| 2.0L Engine | 4.3 l (4.5 quarts) | 5W-30, 5W-20, 10W-30, 10W-40, 10W-50, 20W-20 |
| 2.5L V6 Engine | 4.8 l (5.1 quarts) | 5W-30, 5W-20, 10W-30, 10W-40, 10W-50, 20W-20 |
Use only lubricants of the proper quality to help achieve proper engine and powertrain performance and durability.
The correct lubricants also help promote engine efficiency, resulting in improved fuel economy.
2007 2008 2009 2010 Kia Optima Engine Oil Capacity
| Engine type | Engine Oil Capacity with filter | Oil type |
| 2.0L Engine | 4.3 l (4.5 US qt.) | 5W-30, 5W-20, 10W-30, 15W-40, 20W-50 |
| 2.7L V6 Engine | 4.5 l (4.7 US qt.) | 5W-30, 5W-20, 10W-30, 15W-40, 20W-50 |
2011 2012 2013 2014 2015 Kia Optima Engine Oil Capacity
| Engine type | Engine Oil Capacity with filter | Oil type |
| 2.0 TGDI | 4.6 l (4.86 US qt.) | 5W-30, 5W-40 |
| 2.4 GDI | 4.6 l (4.86 US qt.) | 5W-30, 5W-20, 10W-30 |
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2016 2017 2018 2019 2020 Kia Optima Engine Oil Capacity
| Engine type | Engine Oil Capacity with filter | Oil type |
| 2.4L 4-cyl Engine | 5.1 quarts (4.8 liters) | 5W-20, 10W-30 |
| 2.0L 4-cyl Engine | 4.3 quarts (4.1 liters) | SAE 5W-20, 5W-30, 10W-30 |
| 2.0L 4-cyl Turbo Engine | 5.1 quarts (4.8 liters) | 5W-30, 5W-40, 10W-30, 15W-40 |
| 1.6L 4-cyl Turbo Engine | 4.8 quarts (4.5 liters) | 5W-30, 5W-40, 10W-30, 15W-40 |
How Much Oil Does a Kia Optima Take?
The 2020 Kia Optima with the 1.6L 4-cyl turbo engine takes 5.1 quarts (with filter) of 0W-20 synthetic oil. The Kia K5 with a 2.5L 4-cyl turbo engine takes 6.1 quarts (with filter) of 0W-30 synthetic oil. A new oil filter and a crush washer are required.
