Rebuild, recondition, exchange or replace? What to do with a dead Subaru engine

If you have just been told your engine is gone, you are about to be offered four different things, described in words that sound interchangeable and are not. One quote says rebuild. One says reconditioned exchange. One says a good low kilometre import. One says a new short block.

The prices will be a long way apart, and so will what you actually get.

The short answer

There is no Australian standard, code or trade definition separating rebuilt, reconditioned and remanufactured. Every supplier uses its own scheme and they contradict each other. One Australian reconditioner puts it plainly: the term reconditioned engine gives you a broad description, not a complete build specification.

So the label tells you nothing. The build sheet tells you everything. The single most useful thing you can do before spending four or five figures is ask what was actually machined, what was replaced and what was reused as found.

And one distinction almost everyone gets wrong: reconditioned describes the work done to the engine. Exchange describes the supply arrangement. They are not alternatives to each other.

The four options, and what you really get

That second row is the one that catches people. Published Australian terms from more than one supplier state it outright: reconditioned engines are sold bare long, and accessories or manifolds are not guaranteed to fit your model. The engine price is not the job price.

Why "reconditioned" is not a specification

Ford Australia publishes the clearest manufacturer definition available in this country. A reconditioned engine is one that has been disassembled, machined and cleaned, typically using non genuine aftermarket components, with repairs that may not meet the original manufacturer standards. Remanufactured means returned to original factory specification using genuine parts, with new pistons and rings, timing components and yielded fasteners replaced as a matter of course. Ford states flatly that a remanufactured engine is not the same as a reconditioned engine or a repaired engine.

Nobody is obliged to follow that. Australian suppliers use the three words interchangeably, in different orders, with different meanings. One reconditioner we read uses reco, rebuilt and reconditioning on the same page for the same product. A specialist up the coast runs its own three tier scheme with rebuilt at the bottom and remanufactured at the top.

None of that is dishonest. It is just unregulated. Which is why a lower advertised price may represent a different package rather than a comparable engine offered for less, and why the only sensible response is a list of questions.

First question: is your block actually scrap?

Everything else is speculation until someone has measured. Subaru itself gives the plainest test, in its own service bulletin covering the oil consumption repair on FB engines. A replacement short block is required if cylinder roundness or taper is out of specification, or if vertical scoring can be caught with a fingernail.

That is the manufacturer, in writing, giving you a pass or fail you can picture. Three things get measured and any one of them can end the conversation:

• Cylinder bores. Roundness and taper against specification, and scoring you can feel.
• Crankshaft. Subaru specifies maximum bend of 0.035 mm, out of roundness on pins and journals of 0.005 mm or less, a taper limit of 0.07 mm, and a grinding limit of 0.250 mm. That last figure is the one that matters after a spun bearing. A crank that has been fed bearing material and heat is frequently past it.
• Cylinder heads. Warpage should not exceed about 0.002 inch, and heads that fail get resurfaced to a 20 to 30 microinch finish, not simply flattened.

A quote given without a strip and measure is a guess. That is not a criticism of whoever gave it, it is just the nature of the thing.

What actually brings a Subaru to this decision

Head gasket on a naturally aspirated EJ25

The SOHC engines leak externally, weeping oil and coolant along the seam. Caught before it overheats, this is a gasket job and not a rebuild conversation at all. Driven hot, it becomes one, because now the heads, the bores and the crank all need checking. The pivot is not the gasket, it is the overheating.

Spun big end bearings on EJ255 and EJ257

The usual mechanism is the oil pickup. The original uses thin wall tubing joined to the flange with a brazed joint rather than a full weld, and as a crack grows the pickup draws air and oil pressure can drop suddenly with no warning. Because the crack is inside the sump it is invisible at an oil change, and cracked pickups turn up on low kilometre cars as well as high ones. In many cases the first sign of a problem is the spun bearing itself.

Viability here depends entirely on the crank. The block usually survives. This is the classic case where a new short block beats a rebuild on both cost and time.

Ringland failure on turbo EJ

The ringland is the thin aluminium wall between piston ring grooves. Detonation is the primary cause, and it is progressive rather than sudden, each knock event adding micro fractures until they connect. Compression drops, blow by increases sharply and the engine loses power. It is overwhelmingly concentrated in the EJ255 and EJ257, mostly modified examples.

This is the one where the block is often scrap, because pieces of the fractured ringland score the cylinder walls on the way out.

On the FA20 it is a recognised risk under boost and tune rather than a known endemic fault. The better documented FA20 issues are carbon build up on the intake valves, pre ignition, timing chain wear before 2016 and lugging at low revs.

Why a boxer costs more than the engine next to it

This is not a Subaru tax. It is geometry.

• Two cylinder heads. Two head gaskets, two sets of valve work, two camshaft banks on a DOHC, two timing arrangements. An overhaul needs duplicates of nearly everything.
• Both sides, and usually out. The crank is sandwiched between two case halves, so there is no drop the sump and do the bearings path that an inline engine gives you. On most Subarus meaningful work means the engine comes out.
• Open deck. Factory EJ and FA blocks use an open deck design where the cylinder walls are anchored only at the base. Under boost the unsupported walls can flex, and in extreme cases the sleeves crack, which means a new block rather than a machined one.
• Oil sits against the gasket. With the cylinders horizontal, oil drains down and rests against the head gasket after shutdown, which is part of why the EJ25 gasket has the reputation it has.

Parts that must never be reused, whatever the quote says: head bolts, which are torque to yield on these engines, connecting rod bolts, which Subaru states in its own bulletin are one time use, head gaskets, all gaskets and seals, bearings, rings, the timing belt where fitted, the water pump and the thermostat.

What it costs in Australia

Published Australian figures, October 2026. These are other people's prices, not ours, and we have put ours at the end.

Two gaps worth knowing about, because the honest answer is more useful than a made up range. No Australian automotive machine shop we could find publishes machining prices, so bore and hone, crank grind, head skim and crack testing are all quote on inspection. And there is no published Australian price for a genuine naturally aspirated EJ253 or FB25 short block, which is the engine most people reading this actually own.

Nobody publishes turnaround times either. Ask, and get it in writing.

The traps, with the receipts

Every one of these comes from a real Australian supplier's own published terms. We are not suggesting anyone is doing anything wrong. We are suggesting you read the document before you pay.

1. The warranty may exclude labour. One set of terms excludes any labour cost unless arranged in advance, and excludes freight. Another includes labour, but only for the first six months of a twelve month warranty, and excludes engine removal entirely. A failure in month nine then costs you ten to fifteen hours of labour to collect on a free part.
2. The conditions are stricter than you think. Published conditions we read require a new thermostat, the radiator cleaned or replaced, all hoses checked, the old corrosion inhibitor completely flushed, new oil and filter, oil changes every 5,000 km with documentary evidence, and installation by a qualified repairer. One supplier fits a heat tab to the engine and treats the engine as having been overheated if the tab has fallen off.
3. There may be a mandatory first service. One set of terms requires a 1,000 km service including oil and filter, cooling system pressure test, recheck of fitment bolts and a road test, then services at 5,000, 10,000 and 20,000 km. Miss the first one and the warranty is compromised.
4. Any modification can void it entirely. Including tuning. If you are putting an engine into a modified car, read this clause first, not last.
5. The engine arrives bare. See the table above. Budget the transfer labour.
6. An imported engine's history is not knowable. Everything that can be verified about a Japanese import, auction sheets, deregistration certificates, chassis number lookups, attaches to a whole vehicle. None of it attaches to a bare engine on a pallet. One Australian importer concedes on its own site that it is not possible to quote an exact mileage, while marketing the same engines as guaranteed low kilometres. Both statements cannot be true.
7. Fitting a new engine without fixing what killed the old one. This is why the supplier conditions demand a new thermostat and a cleaned radiator. If the original engine died because the cooling system failed, the replacement dies the same way, and the warranty will not pay because you did not meet the condition.
8. Core charges. Paid up front, refunded when the old unit comes back, drained, on the same skid. No refund for cores that are disassembled, unserviceable or were run low on oil. A seized engine may not be worth its own core refund.

What to ask before you pay anyone, including us

• Is this a short motor, a long bare, a long dressed or a complete engine? What is physically in the box?
• Which parts are new, which were machined, and which were reused as found?
• Was the block crack tested? What were the bore roundness and taper measurements?
• Was the crank measured or reground, and to what undersize?
• Were the heads skimmed, and to what flatness?
• New head bolts and new conrod bolts, yes or no?
• What is the warranty period, is labour included, for how long, and does it include engine removal?
• What exactly must I replace or service to keep the warranty valid, and when is the first mandatory service?
• Is the warranty transferable if I sell the car?
• What is the core charge and what condition must the core be in?
• For a used or imported engine: what proof of kilometres exists, and what was the donor vehicle?
• Is installation included or quoted separately?

If a supplier cannot answer most of those in a phone call, that is itself an answer.

How to actually decide

1. Get it measured before you choose. Not a verdict from the noise it made. Measurements.
2. Turbo or naturally aspirated changes the answer. A naturally aspirated EJ25 with an external gasket leak caught early is a gasket job. A turbo EJ with a blown gasket frequently has compromised pistons and bearings behind it, and a new short block becomes a serious contender.
3. Weigh the repair against the car's value. Victoria's own written off vehicle guidance puts the principle simply: a vehicle is written off if the cost to repair it would be more than the value of the vehicle. That rule is about collision damage, not mechanical failure, but as a reference point the commonly used Australian band of 50 to 70 per cent of market value is a sensible place to start thinking.
4. Look at the rest of the car honestly. A $6,600 engine into a car with a tired transmission, no air conditioning and two years of deferred maintenance is money into a hole. You are not deciding whether to fix an engine. You are deciding whether to keep a car.
5. How long are you keeping it? This settles the warranty question. Eighteen months of cover is worth paying for if you are keeping the car five years and worth nothing if you are selling in six months.
6. Does originality matter? A rebuild keeps your engine number. On an early WRX or an STI that can affect what the car is worth.

Where the law sits

Briefly, because it is worth knowing. Consumer guarantees under Australian Consumer Law cannot be removed by any agreement, contract or warranty, so a supplier's warranty document sits on top of the law rather than instead of it. Every exclusion above is an exclusion from a voluntary warranty, not from your statutory rights.

Services must be supplied with acceptable skill, and goods must be of acceptable quality, which means safe, durable and free from defects. There is no fixed period. The ACCC's own factors include whether the item was sold new or second hand, and what claims the business made about it. That cuts both ways, and fairly: a second hand engine is held to a lower durability standard than a new one, but a supplier who advertised guaranteed low kilometres has made a claim that counts.

One rule almost nobody knows: a business must give you a written repair notice before accepting goods for repair if refurbished parts may be used. The prescribed words are that goods presented for repair may be replaced by refurbished goods of the same type rather than being repaired, and that refurbished parts may be used. It applies whether or not the business knows in advance.

What we do

We quote engine work in three separate lines: machining, parts, and fitting. You see what each one costs rather than a single figure with everything buried in it.

What we charge at Baywrex

Reconditioned engine: $4,000 to $7,000.

Complete rebuild with an STI short block: $7,500 to $12,500.

Head gaskets: $3,000 to $5,500.

Worth comparing those against the published national figures in the table above. A reconditioned long motor is advertised around Australia at roughly $6,400 to $7,000 for the bare engine on its own, before anybody fits it to anything. Our reconditioned range starts well below that, because what goes into a reconditioned engine is not a fixed recipe and the quote follows what your block measures rather than a catalogue price.

The rebuild range is wide because it covers two genuinely different jobs. At the lower end it is a short block and an assembly. At the upper end it is a built engine with the machining, the clearances and the parts an STI bottom end actually needs. Nobody can tell you which one you are buying until the engine is apart and measured.

The head gasket range is the one most owners arrive with, usually after a quote somewhere else gave them a fright. It is a real range rather than a headline number because on a turbo EJ a gasket job frequently uncovers damage behind it, and at that point the honest conversation is about a short block rather than a gasket.

All three move with what comes off the car at the same time. A clutch, a rear main seal, a timing kit or a water pump are cheap while the engine is out and expensive six months later.

What we will do before any of that is pull it apart and measure it, and tell you what we found rather than what we would like to sell you. Sometimes that conversation ends with us saying the car is not worth the engine. We would rather have that conversation at the start than at the end.

The initial assessment costs nothing.

Before you commit to an engine, get it measured

Baywrex, Tower 2 / 591 Dorset Road, Bayswater North VIC 3153. Call 0410 164 954 or book online.

Subaru engine specialists. EJ, FA, FB and EZ rebuilds, exchange engines and replacements for WRX, STI, Forester, Outback, Liberty, Impreza and XV.