Kia Optima / K5 Engines by Year

The Optima was Kia's mid-size sedan, the Hyundai Sonata's twin, renamed K5 for 2021. It shared the Sonata's engines, including the Theta II 2.4 and 2.0 turbo that were recalled in large numbers. The Sonata has its own page.

Pick a year to see every engine offered that model year, with its code, rated horsepower and the trims it came in. Each engine links to its full specs.

Jump to a year

First generation carryover (2006): 2006

MG (2006–2008): 2006 · 2007 · 2008

MG, updated (2009–2010): 2009 · 2010

TF (2011–2016): 2011 · 2012 · 2013 · 2014 · 2015 · 2016

TF, updated (2014–2015): 2014 · 2015

JF (2016–2020): 2016 · 2017 · 2018 · 2019 · 2020

K5 (2021–2026): 2021 · 2022 · 2023 · 2024 · 2025 · 2026

K5, updated (2025–2026): 2025 · 2026

First generation carryover (2006)

The 2.4 four and the 2.7 V6.

2006 Optima / K5 engines

Engine	Rated	Offered in
2.4L / 144 inline-four (G4JS)	—	LX 4-cyl
2.4L / 144 inline-four (G4KC)	161 hp net	LX, EX
2.7L / 165 V6 (G6BA)	170 hp net	LX V6, EX V6
2.7L / 165 V6 (G6EA)	185 hp net	LX V6, EX V6

MG (2006–2008)

The 2.4 four and the 2.7 V6.

2006 Optima / K5 engines

Engine	Rated	Offered in
2.4L / 144 inline-four (G4JS)	—	LX 4-cyl
2.4L / 144 inline-four (G4KC)	161 hp net	LX, EX
2.7L / 165 V6 (G6BA)	170 hp net	LX V6, EX V6
2.7L / 165 V6 (G6EA)	185 hp net	LX V6, EX V6

2007 Optima / K5 engines

Engine	Rated	Offered in
2.4L / 144 inline-four (G4KC)	161 hp net	LX, EX
2.7L / 165 V6 (G6EA)	185 hp net	LX V6, EX V6

2008 Optima / K5 engines

Engine	Rated	Offered in
2.4L / 144 inline-four (G4KC)	161 hp net	LX, EX
2.7L / 165 V6 (G6EA)	185 hp net	LX V6, EX V6

MG, updated (2009–2010)

The 2.4 four and the 2.7 V6.

2009 Optima / K5 engines

Engine	Rated	Offered in
2.4L / 144 inline-four (G4KE)	175 hp net	LX, EX, SX
2.7L / 165 V6 (G6EA)	194 hp net	EX, SX

2010 Optima / K5 engines

Engine	Rated	Offered in
2.4L / 144 inline-four (G4KE)	175 hp net	LX, EX, SX
2.7L / 165 V6 (G6EA)	194 hp net	EX, SX

TF (2011–2016)

The 2.4 GDI, the 2.0 turbo and the hybrid.

2011 Optima / K5 engines

Engine	Rated	Offered in
2.0L / 122 inline-four turbo (G4KH)	274 hp net	SX, EX Turbo, SXL, Limited
2.4L / 144 inline-four (G4KK)	—	Optima Hybrid, EX Hybrid, Hybrid EX
2.4L / 144 inline-four (G4KJ)	200 hp net	LX, EX

2012 Optima / K5 engines

Engine	Rated	Offered in
2.0L / 122 inline-four turbo (G4KH)	274 hp net	SX, EX Turbo, SXL, Limited
2.4L / 144 inline-four (G4KK)	—	Optima Hybrid, EX Hybrid, Hybrid EX
2.4L / 144 inline-four (G4KJ)	200 hp net	LX, EX

2013 Optima / K5 engines

Engine	Rated	Offered in
2.0L / 122 inline-four turbo (G4KH)	274 hp net	SX, EX Turbo, SXL, Limited
2.4L / 144 inline-four (G4KK)	—	Optima Hybrid, EX Hybrid, Hybrid EX
2.4L / 144 inline-four (G4KJ)	200 hp net	LX, EX

2014 Optima / K5 engines

Engine	Rated	Offered in
2.0L / 122 inline-four turbo (G4KH)	274 hp net	SX, EX Turbo, SXL, Limited
2.4L / 144 inline-four (G4KJ)	—	LX, EX
2.4L / 144 inline-four (G4KK) Hybrid: rated output of engine and motors combined.	192–199 hp net	Optima Hybrid, EX Hybrid, Hybrid EX

2015 Optima / K5 engines

Engine	Rated	Offered in
2.0L / 122 inline-four turbo (G4KH)	274 hp net	SX, EX Turbo, SXL, Limited
2.4L / 144 inline-four (G4KJ)	—	LX, EX
2.4L / 144 inline-four (G4KK)	—	Optima Hybrid, EX Hybrid, Hybrid EX

2016 Optima / K5 engines

Engine	Rated	Offered in
1.6L / 98 inline-four turbo (G4FJ)	178 hp net	LX 1.6T (2016-2018), EX / S (later)
2.0L / 122 inline-four turbo (G4KH)	245 hp net	SX, SXL
2.4L / 144 inline-four (G4KJ)	185 hp net	LX, S, EX
2.4L / 144 inline-four (G4KK) Hybrid: rated output of engine and motors combined.	199 hp net	Optima Hybrid, EX Hybrid, Hybrid EX

TF, updated (2014–2015)

The 2.4 and the 2.0 turbo.

2014 Optima / K5 engines

Engine	Rated	Offered in
2.0L / 122 inline-four turbo (G4KH)	274 hp net	SX, EX Turbo, SXL, Limited
2.4L / 144 inline-four (G4KJ)	—	LX, EX
2.4L / 144 inline-four (G4KK) Hybrid: rated output of engine and motors combined.	192–199 hp net	Optima Hybrid, EX Hybrid, Hybrid EX

2015 Optima / K5 engines

Engine	Rated	Offered in
2.0L / 122 inline-four turbo (G4KH)	274 hp net	SX, EX Turbo, SXL, Limited
2.4L / 144 inline-four (G4KJ)	—	LX, EX
2.4L / 144 inline-four (G4KK)	—	Optima Hybrid, EX Hybrid, Hybrid EX

JF (2016–2020)

The 2.4, the 1.6 and 2.0 turbos, the hybrid and the plug-in.

2016 Optima / K5 engines

Engine	Rated	Offered in
1.6L / 98 inline-four turbo (G4FJ)	178 hp net	LX 1.6T (2016-2018), EX / S (later)
2.0L / 122 inline-four turbo (G4KH)	245 hp net	SX, SXL
2.4L / 144 inline-four (G4KJ)	185 hp net	LX, S, EX
2.4L / 144 inline-four (G4KK) Hybrid: rated output of engine and motors combined.	199 hp net	Optima Hybrid, EX Hybrid, Hybrid EX

2017 Optima / K5 engines

Engine	Rated	Offered in
1.6L / 98 inline-four turbo (G4FJ)	—	LX 1.6T (2016-2018), EX / S (later)
2.0L / 122 inline-four turbo (G4KH)	—	SX, SXL
2.0L / 122 inline-four (G4NG)	—	Optima Hybrid, Hybrid EX, Optima Plug-in Hybrid
2.4L / 144 inline-four (G4KJ)	—	LX, S, EX

2018 Optima / K5 engines

Engine	Rated	Offered in
1.6L / 98 inline-four turbo (G4FJ)	178 hp net	LX 1.6T (2016-2018), EX / S (later)
2.0L / 122 inline-four (G4NG)	—	Optima Hybrid, Hybrid EX, Optima Plug-in Hybrid
2.0L / 122 inline-four turbo (G4KH)	245 hp net	SX, SXL
2.4L / 144 inline-four (G4KJ)	185 hp net	LX, S, EX

2019 Optima / K5 engines

Engine	Rated	Offered in
1.6L / 98 inline-four turbo (G4FJ)	178 hp net	LX 1.6T (2016-2018), EX / S (later)
2.0L / 122 inline-four (G4NG)	—	Optima Hybrid, Hybrid EX, Optima Plug-in Hybrid
2.0L / 122 inline-four turbo (G4KH)	245 hp net	SX, SXL
2.4L / 144 inline-four (G4KJ)	185 hp net	LX, S, EX

2020 Optima / K5 engines

Engine	Rated	Offered in
1.6L / 98 inline-four turbo (G4FJ)	—	LX 1.6T (2016-2018), EX / S (later)
2.0L / 122 inline-four turbo (G4KH)	—	SX, SXL
2.0L / 122 inline-four (G4NG)	—	Optima Hybrid, Hybrid EX, Optima Plug-in Hybrid
2.4L / 144 inline-four (G4KJ)	—	LX, S, EX

K5 (2021–2026)

The 1.6 turbo and the 2.5 turbo.

2021 Optima / K5 engines

Engine	Rated	Offered in
1.6L / 98 inline-four turbo (G4FP)	180 hp net	LX, LXS, EX, GT-Line
2.5L / 152 inline-four turbo (G4KP)	290 hp net	GT

2022 Optima / K5 engines

Engine	Rated	Offered in
1.6L / 98 inline-four turbo (G4FP)	180 hp net	LX, LXS, EX, GT-Line
2.5L / 152 inline-four turbo (G4KP)	290 hp net	GT

2023 Optima / K5 engines

Engine	Rated	Offered in
1.6L / 98 inline-four turbo (G4FP)	—	LX, LXS, EX, GT-Line
2.5L / 152 inline-four turbo (G4KP)	—	GT

2024 Optima / K5 engines

Engine	Rated	Offered in
1.6L / 98 inline-four turbo (G4FP)	180 hp net	LX, LXS, EX, GT-Line
2.5L / 152 inline-four turbo (G4KP)	—	GT

2025 Optima / K5 engines

Engine	Rated	Offered in
2.5L / 152 inline-four (G4KN)	191 hp net	LXS, EX, GT-Line
2.5L / 152 inline-four turbo (G4KP)	290 hp net	GT

2026 Optima / K5 engines

Engine	Rated	Offered in
2.5L / 152 inline-four turbo (G4KP)	—	GT
2.5L / 152 inline-four (G4KN)	—	LXS, EX, GT-Line

K5, updated (2025–2026)

The 2.5 and the 2.5 turbo.

2025 Optima / K5 engines

Engine	Rated	Offered in
2.5L / 152 inline-four (G4KN)	191 hp net	LXS, EX, GT-Line
2.5L / 152 inline-four turbo (G4KP)	290 hp net	GT

2026 Optima / K5 engines

Engine	Rated	Offered in
2.5L / 152 inline-four turbo (G4KP)	—	GT
2.5L / 152 inline-four (G4KN)	—	LXS, EX, GT-Line

Working on one of these engines?

• Engine displacement from bore and stroke
• Static and dynamic compression ratio
• Which camshaft for your build
• What size carburetor
• Horsepower to torque at any RPM
• Torque converter stall speed

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