Brand New G4KJ 2.4L GDI Petrol Long Engine for Kia Sportage QL 2015-2021

About this engine

When the G4KJ 2.4L GDI petrol engine in a Kia Sportage QL reaches the end of its life, fitting a brand-new unit is usually the cleanest fix. Engine Zone supplies a new G4KJ long engine suited to Sportage QL models sold between 2015 and 2021, built to OEM fitment specification with key internal components upgraded beyond the original design.

This is not a reconditioned or second-hand engine. Each one is built from new components, then hot and cold tested before dispatch, so your mechanic receives an engine that is ready to fit. On this page you’ll find the background on the Theta II family, exactly what a long engine includes, and how ordering, freight and warranty work. If anything is unclear, call 1300 200 320 and talk it through with us before you commit to anything.

Is a new engine worth it on a Sportage QL?

The Sportage QL is still a common sight on Australian roads, and most examples are worth keeping if the body, transmission and interior are in good order. The engine is often the only thing standing between the car and several more years of service, which makes the repair-versus-replace question a practical one rather than an emotional one.

Once a G4KJ develops a rod knock or starts consuming oil heavily, partial repairs rarely hold up. Bearing material that has broken down tends to circulate through the oil galleries, so a quick bottom-end fix on the original block carries real risk of a repeat failure. A second-hand engine from a wrecker is cheaper up front, but its service history and internal condition are unknown, and it may carry the same wear that killed the original.

A brand-new long engine resets the odometer on the part of the car most likely to end its life. Every component inside it is new, machined to factory tolerances, and covered by a written warranty. For an owner who plans to keep the Sportage for years rather than months, that certainty is usually what tips the decision. It also matters at resale: a receipted new engine is far easier to explain to a buyer than a patched or transplanted one. If you're weighing it up against the trade-in value of the car, get a fitted quote from your mechanic first, then ring us on 1300 200 320 so you can compare real numbers instead of guesses.

Common Theta II problems, and what's different inside this engine

The G4KJ belongs to Hyundai and Kia's Theta II engine family, a range of four-cylinder petrol engines used widely across both brands. The family includes the G4KE with multi-point injection, the G4KJ with direct injection, a turbocharged 2.0-litre GDI known as the G4KH, and the G4KG. All of them run double overhead camshafts, 16 valves and a chain-driven timing system, so there is no timing belt interval to schedule.

In the Sportage QL, the G4KJ's direct injection helps throttle response and fuel economy, because fuel is sprayed straight into the combustion chamber at high pressure. The trade-off, common to GDI designs from many manufacturers, is that petrol never washes over the backs of the intake valves, so carbon deposits can accumulate there over time. That build-up affects the induction system rather than the long engine itself, and it is manageable with sensible servicing.

The Theta II is also known for a documented pattern of rod-bearing wear in higher-kilometre engines. In some overseas markets this led to recalls and extended warranty programs. It is worth stating plainly rather than dramatising: plenty of these engines cover big distances without trouble, but when the bottom end does let go, the damage generally isn't economical to repair. That is the main reason a complete replacement engine, rather than a rebuild of the original, has become the standard fix for a failed G4KJ. Our replacement engines respond to that history directly: they match OEM fitment specification exactly, but internally they are upgraded where the original design had documented weaknesses — higher-grade connecting rods, crankshaft and bearings go in place of the standard items, so the known weak point is strengthened rather than reproduced.

From order to your mechanic's hoist

What you receive is a long engine: the assembled block and cylinder head complete with crankshaft, pistons, connecting rods, camshafts and valvetrain. External hardware — the intake and exhaust manifolds, injectors, fuel pump, sensors and accessory brackets — transfers across from your old G4KJ during installation, which is normal practice and keeps the price sensible.

Before you pay for anything, send us your VIN and we'll confirm this engine matches your exact Sportage QL variant. It's a free check and it removes the single most common cause of returns in this business. Once ordered, freight anywhere in Australia costs you nothing; we crate the engine and dispatch it to your nominated workshop.

Every engine is hot and cold tested after assembly, so it has already run before it reaches you. A heat tab is fitted to the block: if that tab shows the engine has been overheated in service, warranty on the engine is void, so keeping the cooling system healthy is on you and your mechanic from day one. Parts are covered for 12 months or 50,000 km, whichever comes first.

Installation must be carried out by a qualified mechanic. Beyond the warranty requirement, a professional fitment means the cooling system is bled properly, the oil system is primed, and old contaminated components aren't carried over. Most workshops can turn the job around in a couple of days once the engine lands. Questions before ordering? Call 1300 200 320.