Subaru Engine Replacement Options

Repair, Rebuild or Replace? How do I choose?

In today’s automotive engine industry there are many terms used to describe Subaru engine repair techniques and consumers are often unsure about exactly what they are getting. Terms like “repaired”, “overhauled” or “reconditioned” or “re-manufactured” can be misleading because they mean different things in different workshops and there is no governing body to set and maintain standards. Sometimes this means consumers are worse off than before, because they might have purchased something that either exceeded their needs, or failed to meet them. Consumers have differing needs, in terms of application and budget. They might need a repair for an older car that won’t exceed the value of the car, or they may want a high quality replacement engine for a late model vehicle that will give long life and high reliability.

At All Drive Subaroo we have worked over many years and invested heavily in designing clearly defined levels of engine construction for differing purposes and budgets. Our different engine builds cater for all consumers, from those who need to keep an older car going inexpensively, to motorsport enthusiasts who need an engine strong enough to develop high power with high reliability.

Apart from the confusion in the industry as to engine construction methods, consumers have to also be mindful of the different engine configurations. Engines are marketed in four configurations: short block, long bare engine, long dressed engine, and fully assembled crate engine. Which one is best for you will depend on the mileage of your vehicle, and on the condition of the cylinder heads and peripheral components such as the turbo, the coolant and air hoses, and the water pump.

The complexity of choice has been made worse by the evolution of Subaru engines into different types for different applications, as well as incremental changes to adjust for new laws and standards,. Subaru engines have developed into several types and capacities, in part to meet consumer demand for style and performance, but mainly for fuel efficiency and emissions control. Subaru face challenges ranging from designing efficient normally aspirated four and six cylinder engines to high performance turbo charged models. Subaru have also worked hard to compete with engine designs from other manufacturers, in terms of servicing and general running costs.

Engine purchase cost is another factor that makes choice more difficult. Australian prices are high, compared with Europe and and North American prices, and it is tempting to buy an imported engine for considerably less money than one that has been built in Australia. However, there are traps and complexities when considering imported engines. Subaru engines are designed to meet specific local requirements and an engine designed for the European or US market is not likely to be interchangeable with an Australian complied vehicle. Consumers have often been caught out with a bad investment in an engine they are unable to use in an Australian complied vehicle.

Engine configurations

Short or long, bare or dressed

As if sifting though the different engine types to find the right one for your car wasn’t confusing enough, you also have to decide just how much of your old engine you need to replace. Do you just need a new block, crank and pistons? Or do you also need cylinder heads? What can you re-use from your old engine assembly, and what should be replaced? Some items it is good practice to replace as a matter or routine; things like coolant hoses, timing belt, water pump. Other more expensive components, such as cylinder heads, will depend on the mileage of your vehicle, and the condition of the components. All Drive Subaroo have expert consultants standing by to help you make the right choice. See below for details of each choice.

View information on engine configurations

Engine construction methods

Guaranteed rebuilt, reconditioned or remanufactured engines – peace of mind

The final decision to be made is between a used engine, or one of several restoration options. At ADS we offer four levels of engine replacement, rebuilt, reconditioned, remanufactured, and for turbo models, Cosworth. Level 1 is a “repaired” or “rebuilt” engine that has been dismantled, inspected, cleaned and reassembled with new and serviced components and comes with a basic warranty. Level 2 is a “reconditioned” engine that has undergone a process of replacing and refurbishing to precise high quality Subaru specified standards. Level 3 is our “remanufactured” engine, which represents the highest level of Subaru engine restoration. Remanufacturing produces by far the most durable engine, and incorporates all the latest revisions to address inherent weaknesses. At ADS we also offer a fourth level available only for turbo models, an engine that has been remanufactured using Cosworth performance components. The warranty terms vary with each method.

View information on engine construction methods

The Many Engine Modes of Subaru

The Many Engine Modes of Subaru

Subaru are an innovative research and development oriented company, and their range of engines has evolved rapidly in response to consumer demand, competition initiatives, and changing emissions and fuel consumption requirements. Engines must also vary for different applications; low revving high torque engines for load carrying ability, and high revving high output engines for motorsport application. Cars like the Forester and Outback tend to have lower revving high-torque undersquare engines for cruising and pulling loads, while the WRX and STI models have high revving over square engines designed to produce power at the high rev ranges. See below for the full range of Subaru engine types.

View information on engine modes of Subaru




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    what our clientS say about us

    Subaru WRX 2015 EJ2.5 Standard Engine “Anyone can change your oil but what you should be looking for is someone that properly services your car. The guys at ADS know and love Subarus and that’s why I trust ADS to look after my car.”

    Dr Chris Griffith

    Senior Process Chemist
    ANSTO Minerals

    This is a 99 Subaru STI Coupe from Orange Subaru. We built a Cosworth engine and a 6 Speed STI Transmission for it, along with a fair few adaptations, including modified manifolds and custom Haltech tuned ECU. When it left our shop it was making 300kw at the wheels and...

    Organe Subaru

    “Upgrading my Subaru with a forged Cosworth engine was not a decision I took on lightly and am happy to say my experience with All Drive Subaroo has exceeded my expectations. Not only was I impressed by the amount of technical knowledge/experience Niazi and the team provided but what really...

    James Knighton

    Hi Niazi – just thought I’d give you some updates on what I assume is the only dual-range FXT in Canada 🙂 Car is running great – I have about 25,000 kms on the gearbox without any issues (there is a rattle at idle that goes away when I depress...

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    Montreal Bronze Limited
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    I would like to extend my gratitude with your professionalism relating to my recent purchase. The guys (Peter and Gavin) at Meng were also extremely helpful and I would recommend their business for any future clients of yours in Mackay. Thank you all once again, it is refreshing to see...

    Warren Bolton

    Hey guys Just wanted to say a huge thankyou for the service you provided me today. Was dealing with Nazi and what an easy bloke to communicate with. Ordered my turbo, gaskets and hose for a wrx and it is all in transit. That’s fast service in my eyes. Just...

    Luke Singleton

    Having bought a MY00 WRX (bugeye) without sufficient knowledge of the vehicle’s history and lack of maintenance routines that had been carried out on it over the years and several owners, I was in a sticky situation. Luckily, I stumbled across the details for All Drive Subaroo – the team...

    Bruce Loveridge

    Engineering Manager

    My engine had issues with Cylinder 3 and lack of compression. So I did some research and found “All Drive Subaroo” online after searching for someone local to me in Melbourne. So I called up All Drive Subaroo and Niazi answered with a firm understanding and knowledge of Subaru’s and...

    Glen Lonsdale

    Hi Niazi, Just wanted to take a minute to thank you for the work done on my Forester. I’ll be forwarding your workshop details to anybody and everybody I know who has a Subaru. My work contact details are listed in the signature of this email. If you ever need...


    Engineering Manager

    Hi ADS guys! Thanks for getting me back on the road so fast. I’ve had this car for three years, and it’s never gone as well as it does now–can’t hear it running in traffic, and it just eats hills. Getting your reconditioned 2.5 liter engine was the best decision...

    Joanna Doe

    Hi guys, Just spoke to Adam about my sister in-law’s, (Leanne Gordon), WRX that now holds the lap record at the Marulan Driver Training Centre. Home The previous track record was held by her husband Roger Gordon with a time of 47.863 in the same car, as shown in the...

    Phil Stevens

    If you own a Subaru in Sydney and don’t take it to these guys you are missing out. Unparalleled professionalism, Excellent workmanship, and all work done well within the given time frame. Have a few more planned mods for the future and i wouldn’t go anywhere else!

    Nick Taylor

    I recently had my02 wrx engine replaced, with an sti 03 remanefactured engine. I’m extremely impressed with all aspects of ADS peakhurst, they have gone above & beyond in high quality genuine subaru components & are extremely thorough with all aspects including customer service that comes with a smile. All...

    Julian Garland

    I had my WRX inspected here before I purchased it from a Subaru dealer. They managed to squeeze me in even though they had a busy schedule and found out a few things that I got the dealer to fix before the purchase. They couldn’t have been more helpful and...

    Slogan 976

    I recently had my Engine fail, and was looking for somewhere to build me a new engine. Upon looking around on the net, I found All Drive Subaroo, I saw they had engine packages available using Cosworth parts, a name that comes to mind when you think of motorsport. I...

    Ryan Borrow


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    Budget constraints
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    Purpose and driving style
    Are you a city or country driver? Is your car to be worked hard, or just on weekends?
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    Value for money
    Cost vs risk: take a chance on a replacement car, or fit a new gearbox to the one you know?
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    How much will a new engine increase the resale value of your car?
    Peace of mind
    Subaru Engine Australia builds the most reliable Engines in the industry. Drive with confidence.
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