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  • Australia Wide delivery
  • Changeover basis

Kia Optima G4KJ 2.4L GDI Petrol Engine 2015–2020

$5,300.00 ex. GST

Price based on changeover. Fitting available at extra cost.

  • Competitive engine pricing
  • Engine fitting available in Hallam
  • Australia-wide delivery available
  • Warranty included*
  • Fitment assistance available
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  • Not sure whether this engine fits your car? Send us your VIN, build year and existing engine code before ordering.

Product Short Description

Looking for a replacement Kia Optima G4KJ 2.4L GDI petrol engine for a 2015–2020 vehicle? Hyundai & Kia Engines supplies replacement G4KJ engines for compatible later-model Optima applications, with professional fitting available in Hallam and freight throughout Australia.

Although the G4KJ engine code is also associated with earlier Optima vehicles, production-year differences mean compatibility should be checked carefully before purchasing.

12-month warranty

On all engines

shipping

Australia-wide

Expert fitting

Dandenong workshop

10+ years exp.

Hyundai & Kia

Kia Optima G4KJ 2015–2020 Engine Overview

Replacement G4KJ Engine for Later Kia Optima Models

The G4KJ 2.4L GDI petrol engine is part of Hyundai and Kia’s Theta engine family and combines a naturally aspirated four-cylinder design with direct fuel injection.

This page is specifically structured around compatible 2015–2020 Kia Optima G4KJ applications.

Even where an earlier and later vehicle share the same base G4KJ engine designation, changes can occur across vehicle generations and production periods.

For that reason, customers should confirm:

  • 2.4L displacement
  • Naturally aspirated operation
  • Inline four-cylinder configuration
  • Gasoline direct injection
  • DOHC cylinder-head design

before purchasing.

Kia Optima G4KJ 2015–2020 Engine Specifications

Specification Details
Engine Code G4KJ
Engine Family Hyundai/Kia Theta
Engine Capacity 2.4L
Fuel Type Petrol
Fuel System GDI – Gasoline Direct Injection
Aspiration Naturally Aspirated
Configuration Inline 4-Cylinder
Valve Layout DOHC, 16-Valve
Vehicle Application Kia Optima
Target Application Compatible 2015–2020 Vehicles
Engine Fitting Available
Workshop Hallam, Melbourne
Delivery Australia-Wide
Warranty Refer to current product warranty conditions

Does This G4KJ Fit My 2015–2020 Kia Optima?

Vehicle Identification Before Purchase

For the later Optima application, check:
  • VIN
  • Build month and year
  • G4KJ engine identification
  • Optima generation
  • Vehicle variant
  • Transmission
  • Sensors and wiring
  • Intake components
  • Exhaust components
  • Ancillary equipment

Important

A vehicle falling within the 2015–2020 year range does not alone guarantee compatibility.

The current engine code and individual vehicle information should still be confirmed.

Send us your VIN and engine code

Check Compatibility

Need Us to Fit Your Hyundai & Kia Engine?

Hyundai & Kia Engines offers professional engine fitting from our workshop in Hallam, Melbourne.

Our team specialises in Hyundai and Kia engines, allowing customers to purchase an engine and arrange installation through the same business.
Engine fitting can include removal of the existing engine, installation of the replacement unit and associated work depending on your vehicle and the engine being supplied.
Contact us with your vehicle details for current fitting pricing and availability.
Get An Engine Fitting Quote

Hyundai & Kia Engines Delivered Across Australia

You do not need to be located in Melbourne to purchase your replacement engine from Hyundai & Kia Engines.
We can arrange engine freight to customers, automotive repairers and workshops throughout Australia, including:
  • Melbourne
  • Sydney
  • Brisbane
  • Adelaide
  • Perth
  • Canberra
  • Hobart
  • Regional Victoria
  • Regional NSW
  • Regional Queensland
  • Regional South Australia
  • Regional Western Australia

Warranty on Your Hyundai & Kia Engine

Your engine is supplied subject to the warranty conditions applicable to the particular engine purchased.

Before installation, customers and installers should review the applicable warranty requirements and ensure associated vehicle systems are checked where necessary.

Our team can also assist with:
  • Engine identification
  • Fitment questions
  • Installation enquiries
  • Warranty information
  • Freight enquiries
  • General technical questions relating to the engine supplied
For full details, refer to our current warranty terms or contact our team before purchasing.

Kia Optima G4KJ 2015–2020 FAQs

Is this page for 2015–2020 Kia Optima vehicles?
Yes, it is intended for compatible G4KJ applications from that production period. VIN and engine-code confirmation is still recommended.
It is a petrol engine.
Yes. It uses gasoline direct injection.
No. Do not assume complete interchangeability based on the G4KJ code alone.
Yes. Send us the VIN, build date and existing engine code.
Yes. Engine fitting is available from our Hallam workshop.
Yes. Australia-wide engine freight can be arranged.

Earlier vs Later Kia Optima G4KJ Applications

Why Production Period Matters

The G4KJ engine code can appear across more than one Kia Optima production period.
However, the complete engine installation may include differences in:
  • Electrical connections
  • Sensors
  • Intake components
  • Exhaust components
  • Ancillary equipment
  • Engine management
  • Mounting hardware
  • Vehicle-specific systems
For this reason, we separate the Optima G4KJ range into:

2011–2014 Kia Optima G4KJ

For compatible earlier applications.

2015–2020 Kia Optima G4KJ

For compatible later applications — this page.

This makes it easier for customers to start with the correct product before the VIN and engine code are checked.

Signs Your Kia Optima Engine May Need Replacement

Symptoms that may indicate major internal engine damage include:

  • Persistent knocking or tapping
  • Excessive oil consumption
  • Low cylinder compression
  • Persistent misfiring
  • Significant loss of performance
  • Oil-pressure warning
  • Severe overheating
  • Excessive exhaust smoke
  • Coolant/oil contamination
  • Metal contamination in the engine oil
  • Internal bearing damage
  • Piston or cylinder damage
  • Cylinder-head or engine-block damage
Not all of these symptoms require a complete engine replacement.
A proper diagnosis should establish the underlying fault first.

Kia Optima G4KJ Compatibility

Vehicle Fitment Information

This engine is intended for compatible 2015–2020 Kia Optima vehicles fitted with the G4KJ 2.4L GDI petrol engine.

Compatibility can vary according to:
  • Vehicle generation
  • Build date
  • Engine specification
  • Market specification
  • Ancillary components
  • Original engine configuration

Important

Do not rely on vehicle model and engine capacity alone when ordering.
Where possible, provide your VIN and existing engine code so we can assist with confirming compatibility.

What to Check Before Installing a Replacement Engine

Replacing an engine should involve more than simply removing the damaged engine and fitting another unit.
Where an engine has suffered a major failure, we recommend checking the systems that may have contributed to the original problem.
These can include:
  • Cooling system
  • Radiator condition
  • Thermostat
  • Oil supply and lubrication system
  • Intake system
  • Fuel system
  • Engine mounts
  • Hoses and connections
  • Associated sensors and components
Identifying the cause of the original engine failure can help protect the replacement engine from suffering the same problem.
This section is something I would definitely include because it makes Hyundai & Kia Engines look much more knowledgeable than a normal ecommerce parts seller.

Why Buy From Hyundai & Kia Engines?

Hyundai & Kia Engine Specialists

Hyundai & Kia Engines specialises in replacement engines specifically for Hyundai and Kia vehicles.

From our Hallam workshop, we supply engines to private vehicle owners, mechanics and automotive workshops throughout Australia.

Why customers choose us:

  • Specialists in Hyundai and Kia engines
  • Highly competitive engine pricing
  • Professional engine fitting available
  • Hallam, Melbourne workshop
  • Australia-wide engine freight
  • Assistance identifying the correct engine
  • Warranty and technical support
  • Large range of Hyundai and Kia replacement engines

Get In Touch With Us

Location

3 David Lee Rd, Hallam VIC 3803, Australia

Email

info@iloadengine.com.au

Phone

(03) 8900 6005
0470 394 187

Get Direction





Kia Optima G4KJ 2015–2020 Engine Overview

Replacement G4KJ Engine for Later Kia Optima Models

The G4KJ 2.4L GDI petrol engine is part of Hyundai and Kia’s Theta engine family and combines a naturally aspirated four-cylinder design with direct fuel injection.

This page is specifically structured around compatible 2015–2020 Kia Optima G4KJ applications.

Even where an earlier and later vehicle share the same base G4KJ engine designation, changes can occur across vehicle generations and production periods.

For that reason, customers should confirm:

  • 2.4L displacement
  • Naturally aspirated operation
  • Inline four-cylinder configuration
  • Gasoline direct injection
  • DOHC cylinder-head design

before purchasing.

Kia Optima G4KJ 2015–2020 Engine Specifications



Specification

Details

Engine Code
G4KJ

Engine Family
Hyundai/Kia Theta

Engine Capacity
2.4L

Fuel Type
Petrol

Fuel System
GDI – Gasoline Direct Injection

Aspiration
Naturally Aspirated

Configuration
Inline 4-Cylinder

Valve Layout
DOHC, 16-Valve

Vehicle Application
Kia Optima

Target Application
Compatible 2015–2020 Vehicles

Engine Fitting
Available

Workshop
Hallam, Melbourne

Delivery
Australia-Wide



Warranty
Refer to current product warranty conditions

Does This G4KJ Fit My 2015–2020 Kia Optima?

Vehicle Identification Before Purchase

For the later Optima application, check:

  • VIN
  • Build month and year
  • G4KJ engine identification
  • Optima generation
  • Vehicle variant
  • Transmission
  • Sensors and wiring
  • Intake components
  • Exhaust components
  • Ancillary equipment

Important

A vehicle falling within the 2015–2020 year range does not alone guarantee compatibility.

The current engine code and individual vehicle information should still be confirmed.

Send us your VIN and engine code



Check Compatibility

Need Us to Fit Your Hyundai & Kia Engine?

Hyundai & Kia Engines offers professional engine fitting from our workshop in Hallam, Melbourne.

Our team specialises in Hyundai and Kia engines, allowing customers to purchase an engine and arrange installation through the same business.

Engine fitting can include removal of the existing engine, installation of the replacement unit and associated work depending on your vehicle and the engine being supplied.

Contact us with your vehicle details for current fitting pricing and availability.



Get An Engine Fitting Quote


Hyundai & Kia Engines Delivered Across Australia

You do not need to be located in Melbourne to purchase your replacement engine from Hyundai & Kia Engines.

We can arrange engine freight to customers, automotive repairers and workshops throughout Australia, including:



  • Melbourne


  • Sydney


  • Brisbane


  • Adelaide


  • Perth


  • Canberra


  • Hobart


  • Regional Victoria


  • Regional NSW


  • Regional Queensland


  • Regional South Australia


  • Regional Western Australia

Warranty on Your Hyundai & Kia Engine

Your engine is supplied subject to the warranty conditions applicable to the particular engine purchased.

Before installation, customers and installers should review the applicable warranty requirements and ensure associated vehicle systems are checked where necessary.

Our team can also assist with:



  • Engine identification


  • Fitment questions


  • Installation enquiries


  • Warranty information


  • Freight enquiries


  • General technical questions relating to the engine supplied

For full details, refer to our current warranty terms or contact our team before purchasing.

Kia Optima G4KJ 2015–2020 FAQs

Is this page for 2015–2020 Kia Optima vehicles?





Yes, it is intended for compatible G4KJ applications from that production period. VIN and engine-code confirmation is still recommended.

It is a petrol engine.

Yes. It uses gasoline direct injection.

No. Do not assume complete interchangeability based on the G4KJ code alone.

Yes. Send us the VIN, build date and existing engine code.

Yes. Engine fitting is available from our Hallam workshop.

Yes. Australia-wide engine freight can be arranged.

Earlier vs Later Kia Optima G4KJ Applications

Why Production Period Matters

The G4KJ engine code can appear across more than one Kia Optima production period.

However, the complete engine installation may include differences in:

  • Electrical connections
  • Sensors
  • Intake components
  • Exhaust components
  • Ancillary equipment
  • Engine management
  • Mounting hardware
  • Vehicle-specific systems

For this reason, we separate the Optima G4KJ range into:

2011–2014 Kia Optima G4KJ

For compatible earlier applications.

2015–2020 Kia Optima G4KJ

For compatible later applications — this page.

This makes it easier for customers to start with the correct product before the VIN and engine code are checked.

Signs Your Kia Optima Engine May Need Replacement

Symptoms that may indicate major internal engine damage include:



  • Persistent knocking or tapping


  • Excessive oil consumption


  • Low cylinder compression


  • Persistent misfiring


  • Significant loss of performance


  • Oil-pressure warning


  • Severe overheating


  • Excessive exhaust smoke


  • Coolant/oil contamination


  • Metal contamination in the engine oil


  • Internal bearing damage


  • Piston or cylinder damage


  • Cylinder-head or engine-block damage

Not all of these symptoms require a complete engine replacement.

A proper diagnosis should establish the underlying fault first.

Kia Optima G4KJ Compatibility

Vehicle Fitment Information

This engine is intended for compatible 2015–2020 Kia Optima vehicles fitted with the G4KJ 2.4L GDI petrol engine.

Compatibility can vary according to:



  • Vehicle generation


  • Build date


  • Engine specification


  • Market specification


  • Ancillary components


  • Original engine configuration

Important

Do not rely on vehicle model and engine capacity alone when ordering.

Where possible, provide your VIN and existing engine code so we can assist with confirming compatibility.

What to Check Before Installing a Replacement Engine

Replacing an engine should involve more than simply removing the damaged engine and fitting another unit.

Where an engine has suffered a major failure, we recommend checking the systems that may have contributed to the original problem.

These can include:



  • Cooling system


  • Radiator condition


  • Thermostat


  • Oil supply and lubrication system


  • Intake system


  • Fuel system


  • Engine mounts


  • Hoses and connections


  • Associated sensors and components

Identifying the cause of the original engine failure can help protect the replacement engine from suffering the same problem.

This section is something I would definitely include because it makes Hyundai & Kia Engines look much more knowledgeable than a normal ecommerce parts seller.

Why Buy From Hyundai & Kia Engines?

Hyundai & Kia Engine Specialists

Hyundai & Kia Engines specialises in replacement engines specifically for Hyundai and Kia vehicles.

From our Hallam workshop, we supply engines to private vehicle owners, mechanics and automotive workshops throughout Australia.

Why customers choose us:



  • Specialists in Hyundai and Kia engines


  • Highly competitive engine pricing


  • Professional engine fitting available


  • Hallam, Melbourne workshop


  • Australia-wide engine freight


  • Assistance identifying the correct engine


  • Warranty and technical support


  • Large range of Hyundai and Kia replacement engines

Get In Touch With Us


Location

3 David Lee Rd, Hallam VIC 3803, Australia



Email

info@iloadengine.com.au



Phone

(03) 8900 6005

0470 394 187



Get Direction

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