Filling the engine with the best oil for WRX will prolong the longevity of your vehicle engine. A suitable oil helps to protect your engine against wear, sludge, rust and reduces engine pressure. As a result, you will gain extra mileage and an increased fuel economy.
Subaru recommends three types of engine oil- 0w-20, 5w-20, and 5w-30. Which oil type will be perfect for your existing car will depend on its model & year. Depending on the car manual, we enlisted the 9 best oil for Subaru WRX. In return, you don’t need to worry about picking the right oil.
Therefore, we also included a nifty buying guide at the end of this article. It will help you purchase the perfect oil for your Subaru. So, let’s get started right here.
Table of Contents
A Quick Preview Of Best Oil For WRX
Here is a quick recap of the oils we reviewed in this guide.
|Amazon Basics Full Synthetic Motor Oil |
Popular Engine Oil For Subaru
|> Incorporates advanced additive technology|
> Specially formulated for Subaru that recommends full synthetic oil
|> Minimize metal frictions by lubricating the moving parts|
> Improve fuel economy
> Fight volatility burn-off to reduce engine deposits
|Valvoline Advanced Full Synthetic Motor Oil|
|> Innovative anti-wear|
> Full synthetic formula
> Extra detergents
|> Provide 50% more wear protection than industry standards|
> Offer exceptional high and low-temperature protection
> Protect your engine against sludge and deposits
|Amazon Basics High Mileage Motor Oil|
Users’ Top Choice
|> Formulated with special oil additive|
> Fights volatility burn-off
|> Provide High-level protection |
> Reduces the likelihood of low-speed pre-ignition
> Protect your engine against oil breakdown
|Castrol Advanced Full Synthetic Motor Oil|
|> Advanced premium full synthetic oil |
> Engineered with fluid titanium technology
> Meets engine test requirements of Chrysler MS-6395
|> Reduces metal-to-metal contact |
> Protects the engine for the entire drain interval even under extreme pressure
> Decreases engine deposit formation to help maximize engine response
|Subaru 5W-30 Engine Oil |
|> Design for Subaru engine oil|
> Include special oil additive
> Recommended by Subaru
|> Reduce metal friction|
> Improve fuel economy
> Boost up engine performance
|Castrol MAGNATEC Full Synthetic Motor Oil |
|> Include intelligent molecules|
> Perfect for Subaru WRX
|> Dramatically reduce engine wear|
> Leave critical engine parts 4X smoother
> Add a layer of protection during warm-up and beyond
|Royal Purple High Performance Motor Oil|
|> Enhanced additive technology|
> Patented anti-wear additive chemistry
|> Better wear protection|
> Increased protection against LSPI
> Increased fuel efficiency
|Mobil 1 High Mileage Full Synthetic Motor Oil|
|> Engineered with active cleaning agents|
> Specially formulated with a seal conditioner
> Contain oil molecules
|> Outperforms our conventional high mileage oils|
> Helps protect critical engine parts in higher mileage engines
> Helps reduce the sludge and deposits
|Castrol MAGNATEC Full Synthetic Motor Oil |
Superior Wear Protective
|> Unique full synthetic technology|
> Oil includes intelligent molecules
|> Superior wear protection on critical engine parts|
> Unsurpassed level of protection against viscosity breakdown
> Dramatically reduce engine wear
|Pennzoil Ultra Platinum Full Synthetic Motor Oil|
Most Reliable for Wear Protection
|> Full synthetic|
> Made from natural gas
> Advanced additive technology
|> Protect engines from loss of power|
> Provide better fuel economy
> Delivers unsurpassed sludge protection
Subaru WRX Oil Type By The Year
What oil you should pour into your Subaru WRX depends on the model & year.
|Model & Year||Oil Type|
|Subaru BRZ 2013 – 2020||0W-20 Synthetic Oil|
|Subaru Forester 2002 – 2010||5W-40 Full Synthetic Oil|
|Subaru Forester 2011 – 2021||0W-20 Synthetic Oil|
|Subaru Forester XT 2004 – 2010||5W-40 Full Synthetic Oil|
|Subaru Forester XT 2011 – 2018||5W-30 Synthetic Oil|
|Subaru Impreza 2002 – 2011||5W-40 Full Synthetic Oil|
|Subaru Impreza 2012 – 2021||0W-20 Synthetic Oil|
|Subaru Legacy & Outback 2002 – 2012||5W-40 Full Synthetic Oil|
|Subaru Legacy & Outback 2013 – 2021||0W-20 Synthetic Oil|
|Subaru Legacy Turbo 2005 – 2010||5W-40 Full Synthetic Oil|
|Subaru Legacy Turbo 2011 – 2012||5W-30 Synthetic Oil|
|Subaru Legacy & Outback 6 Cyl. 2002 – 2019||5W-40 Full Synthetic Oil|
|Subaru Legacy & Outback XT (Turbo) 2020 – 2021||0W-20 Synthetic Oil|
|Subaru WRX 2002 – 2010||5W-40 Full Synthetic Oil|
|Subaru WRX 2011 – 2020||5W-30 Synthetic Oil|
|Subaru Crosstrek 2013 – 2021||0W-20 Synthetic Oil|
|Subaru Crosstrek Hybrid 2014 – 2021||0W-20 Synthetic Oil|
|Subaru Ascent 2019 – 2021||0W-20 Synthetic Oil|
Things To Consider Before Picking The Best Oil For WRX STI
Every oil type is not designed to pour into your Subaru WRX. So, going for any random oil will not perform the best. So, consider the following things before purchasing oil for your WRX.
The first criterion you must take into account is the oil viscosity. It’s the thickness of oil and how the oil will flow in low temperatures. Generally, Subaru recommends these oil viscosity- 0w-20, 5w-20, and 5w-30 for all of its cars. So, check the specific car manual and pick the viscosity grade your Subaru needs.
2. Subaru WRX Oil Consumption
How consistently you change your engine oil will help you figure out the oil consumption of your Subaru WRX. According to Subaru, you should change the oil after 6 months for the first time. Make sure you don’t cross 6K miles.
So, it will be better if you change the oil between 3k-4k miles. It’s a must to change the oil as a new car will experience wear in this period. So, change your engine at the right time, and maintain the car manual guide.
3. Different Types Of Motor Oils
You can find different types of oil for your engine. Let’s check out what oil is best for what. Convention premium oil is perfect for every new vehicle. However, most car manufacturers recommend 5W-30 synthetic oil to let the engine run smoothly in low-temperature conditions.
Full synthetic oil will be your go-to oil option for a lightweight vehicle. Such a type of oil performs the best both in low and high temperatures conditions.
Synthetic blend oil is specially formulated for handling high heat conditions and heavier loads. High mileage oil is perfect for older engines with over 75k miles.
4. Oil Additives For WRX STI
Oil additive is specially formulated to improve oil performance. You can find different types of oil additives. For example, anti-wear additives will help to protect your engine against wear & corrosion.
On the other hand, detergent-based oil additives will deliver optimum engine protection against build-ups and deposits. Fortunately, every oil brand now includes additives in the oil. So, you don’t need to get oil additives separately.
10 Best Oil For WRX STI
After spending hours on research, we enlisted these 10 best oils for Subaru WRX. Each of the oil meets the requirements of your car (no matter what make and model of Subaru you drive)
1. Amazon Basics Full Synthetic Motor Oil 5W-40 With Euro Formula: Best Oil For Subaru WRX 2002-2010
AmazonBasics Full Synthetic 5W-40 Motor Oil with Euro formula is the best engine oil for Subaru WRX. It’s specially formulated to maximize both engine performance & protection of these model & year of Subaru cars:
- Subaru Forester 2002 – 2010
- Subaru Forester XT 2004 – 2010
- Subaru Impreza 2002 – 2011
- Subaru Legacy & Outback 2002 – 2012
- Subaru Legacy Turbo 2005 – 2010
- Subaru Legacy & Outback 6 Cyl. 2002 – 2019
- Subaru WRX 2002 – 2010
Unlike other full synthetic motor oils, this oil from AmazonBasics incorporates advanced technology to deliver optimum engine protection even under severe operating conditions.
This oil can easily travel to the top of your engine and lubricate every moving part. As a result, it reduces metal frictions to shield your car engine against wear & tear and enhances fuel economy.
Something we really love about this engine oil is its ability to resist high viscosity and thermal breakdown. In simple words, this oil doesn’t thin out in high operating temperatures and delivers unmatched engine protection. Nonetheless, this 5W-40 synthetic oil also provides exceptional protection in colder weather.
- Reduce exhaust emissions
- Minimize buildup that can cause rust & corrosion
- Reduce friction to enhance engine protection
- Comes with no level window on the container
Most car owners, especially those who have Subaru WRX 2002-2010 or Subaru Forester 2002 – 2010 found this oil affordable yet functional. It utilizes an advanced additive technology that delivers unsurpassed engine protection against severe operating conditions.
So, they don’t need to worry about engine lubrication, no matter in what climate they drive their car. The only downside they found is- it has no strip on the side of the bottle. Consequently, they can’t tell how much oil they pour into the engine.
2. Valvoline Advanced Full Synthetic SAE 5W-30 Motor Oil: Best Oil For Subaru WRX 2011-2020
Do you expect the best performance out of your vehicle engine even in the toughest conditions? Then, go for the Valvoline Advanced Full Synthetic SAE 5W-30 Motor Oil. This synthetic oil for WRX is specially formulated with an innovative additive technology to fight against severe engine stress like stop & go driving, extreme temperatures, and hauling & towing.
Wear, friction, heat, and deposits are the four main culprits behind engine breakdown. But this oil contains advanced anti-wear additives to protect your engine from those culprits. The synthetic oil keeps every moving part well-lubed and prevents the robbing friction between metal components. So, no wear will occur. Indeed, it delivers 40% more wear protection than industry standards.
Therefore, synthetic oil contains extra detergents to deliver unsurpassed protection against sludge. Indeed, it provides 20% better deposit protection than industry standards.
To sum up, this oil from Valvoline keeps every metal component of your engine well-lubricated, resisting wear, sludge, and deposits. In other words, it reduces engine pressure and maximizes engine life & performance.
- Superior antioxidants resist motor oil breakdown in extreme conditions
- A fully synthetic oil formula delivers up to 10x better protection against heat
- Offer superior wear protection
- The placement of the handle on the jug is incredibly awkward
Every car owner finds this synthetic oil from Valvoline functional. Its standard oil color is the first upside everyone loves. Most car owners can easily check when the oil gets dirty. Pouring this oil into their car, they observed it increases mileage a little bit.
And finally, the container makes it a breeze to add to your vehicle engine. The only downside some users figure out is its leaky container. So, the manufacturer should focus on fixing this issue.
3. AmazonBasics High Mileage Motor Oil-Synthetic Blend-5W-30: Best High Mileage Oil For Subaru WRX STI
Get high mileage motor oil for your Subaru WRX STI that reaches 75k or more miles at an affordable price. This is what we can say about this full synthetic oil that comes from AmazonBasics.
This engine oil is specially formulated to let your car engine with 75000 miles run smoothly. It reduces metal friction and protects your car engine from sludge, wear, and rust.
Like the top-rated oils in the market, it can resist viscosity and thermal breakdown. As a result, damaging deposits, wear, and sludge can’t make their home in the engine compartment or combustion chamber. In other words, it solves the low-speed pre-ignition issue.
- Increase mileage
- Prolong the engine life by protecting it from wear, sludge, and corrosion
- Affordable price
- Some consumers claim that they find the necks of the jug a bit squished, which makes it a bit challenging to pour.
Full synthetic oil at an affordable price! This is the first and foremost advantage of this oil every car owner talks about. After pouring this oil into the engine, they find it helpful to keep the engine running smoothly. Therefore, the users say it’s easy to see the fluid level due to the strip on the jug. The only shortcoming is- some users get a slightly smashed bottle.
4. Castrol Edge 5W-30 Advanced Full Synthetic Motor-Best Oil for Subaru Forester XT 2011-2018
Design for the car owners who demand the best performance from their cars even in extreme driving conditions! And the Castrol Edge 5W-30 Advanced Full Synthetic Oil is what meets your requirements.
Unlike other Castrol oils, it uses fluid titanium technology that makes it the strongest oil of Castrol. Due to this, sludge and wear can’t bring any damage to your engine. This synthetic oil lubes every metal part and reduces friction to prevent engine wear.
Therefore, the synthetic oil for your WRX can resist the stress of your modern engine and deliver 10x better high-temperature performance. As it can absorb the engine pressure, you will get the best performance from it.
- Deliver 6x better wear protection
- Improves oil film strength by 30% and reduces metal-to-metal friction
- Enhance fuel economy
- It’s a bit difficult to open the oil cap
Before using this oil, some owners live with an engine that makes a ticking noise. But they get stunned after changing the oil with Castrol Edge. This synthetic oil eliminates the tick and lets the engine run smoothly and quietly.
Also, they found this oil performs the best under high pressure. Indeed, they recommend the oil for those who look for the best performance oil for high-performance cars.
The only downside is- the oil cap is a bit challenging to open. However, you can overcome this issue using a screwdriver to remove the oil cap.
5. Subaru SAE 5W-30 Engine Oil-Best Oil for Subaru WRX STI Any Model
Whether it comes from Castrol, Royal Purple, or other oil brands, no one can’t beat the oil of a specific car manufacturer. Why? The car manufacturer knows their vehicle well and designed the engine oil to improve its performance. And this Subaru SAW 5W30 Synthetic Motor Oil is undoubtedly the best oil for WRX STI.
As it comes from the Subaru, this oil can withstand viscosity and oil breakdown at high temperatures. Therefore, Subaru Motor Oil also delivers unmatched protection against sludge, corrosion, and deposit formation.
On top of this, you will gain peak performance from your engine as this oil reduces the engine pressure. It keeps every engine component well-lubed and offers superior protection against wear.
- Reduce oil loss because of evaporation and burn-off
- Improve fuel efficiency
- Lubricate every metal component and reduces friction
- The volume of the oil container is only 1 gallon which is not enough to fill your Subaru.
Every Subaru car owner acknowledges this OEM oil as the best oil for their car. It delivers ultimate engine protection against sludge, wear, and deposits. They said this oil doesn’t create excessive burning off in 3K miles and lets the engine run quietly and smoothly. However, most users wish it comes with a 5 quarts container as it is not enough to fill the engine.
6. Castrol GTX MAGNATEC 5W-20 Full Synthetic Motor Oil-Best Oil for Subaru WRX 2015
Testing reveals that 75% of engine wear occurs during the first 20 minutes of warm-up. When your engine stops, oil drains off critical engine components. Consequently, there will be a lack of lubrication, which causes friction between metal parts and forms engine wear.
Fortunately, Castrol GTX Magnatec 5W-20 Full Synthetic Oil is here to handle that engine wear, especially Subaru WRX 2015 model as well as Subaru Legacy Turbo 2011 – 2012 model.
The oil contains intelligent molecules. They form an extra layer of protection and lubricate every metal part during warm-up. Due to this, no wear will occur as it reduces metal-to-metal contact dramatically.
In short, this full synthetic oil keeps every critical engine part well-lubed and makes those parts 4x smoother.
- Provide optimum engine protection against wear
- Keeps every engine component well-lubed
- Reduce engine stress
- Some users are not satisfied with the shipping as they find the package leaks oil
Most car owners are satisfied with this oil performance. It keeps their engine safe from excessive heat. Also, this engine oil supports them when hauling the car and driving it in the snow. The users are surprised by noticing its cleaning power and ability to lubricate the cylinder walls. The only thing some consumers don’t like is the frequent shifting of the price.
7. Royal Purple High-Performance Motor Oil 5W-30-Top oil for 2005 Jetta
The synthetic expert! Perhaps you have heard these phrases before. If our assumption is right, you might think about Royal Purple Synthetic Oil. Yes, we talk about Royal Purple, which outperforms other synthetic and mineral-based oils.
Its enhanced additive technology prevents metal frictions by lubricating every engine part of your car engine. And you know that a low coefficient of friction reduces engine stress and increases fuel economy. Therefore, its patented anti-wear additive increases engine protection against LSPI, sludge, and wear.
And last, not least is- the anti-wear additive chemistry minimizes the harmful effects exhaust gases pose to catalysts.
- Provide better wear and corrosion protection
- Increased protection against LSPI
- Enhance fuel efficiency
- It will not be worth the price if you don’t use it in the high-performance car
Car owners are surprised by its performance. Some users claim that the transmissions of their car made odd noises before using this oil. Once they switch to this Royal Purple Oil, the noise in the transmissions is gone. Plus, they found this oil increases the fuel economy and prolongs the oil change interval. However, some users complain that the oil gets dirty.
8. Mobil 1 High Mileage Full Synthetic Motor Oil 5W-30: Especially Best Oil for WRX STI 2017
Mobil 1 High Mileage full synthetic motor oil 5W-30 is specially formulated to prolong the life of high mileage engines over 75000 miles. The proprietary blend this oil includes protects 10000 miles between oil changes.
Unlike other oils on this list, Mobil 1 contains a seal conditioner, reducing oil leaks in high mileage cars. The oil molecules of this oil keep your engine components well-lubed and provide ultimate engine protection against wear, sludge, and damaging deposits.
Turns out, this oil can resist high heat conditions (up to 500 F.) and low-temperature (-40-degree F) as well. Indeed, the Mobil 1 synthetic oil provides ultimate engine protection under extreme weather conditions.
So, if your WRX STI 2017 or any models from WRX STI got high mileage over 75000 miles, you should use this Mobile high mileage engine oil to prolong your engine life.
- Help to control oxidation to prevent oil breakdown
- Enhance fuel efficiency
- Protect your car engine against wear, sludge, and damaging deposits
- Some users complain that the oil has such a thin viscosity. Due to this, the fluid level goes down as it’s burning so quickly.
Every vehicle owner loves this synthetic oil from Mobil 1 for its ability to protect the engine against sludge and wear. Since then they have started using this oil, and they have never faced oil-related failures. Affordable price is also another reason they love this oil most. The only shortcoming is- the fluid level goes down quickly due to its thin viscosity.
9. Castrol GTX MAGNATEC 0W-20 Full Synthetic Motor Oil: Best Oil for Subaru BRZ 2013-20
Castrol 03060 GTX MAGNATEC 0W-20 Full Synthetic Motor Oil is specially formulated to deliver instant engine protection from the moment you start.
This super synthetic oil is specially tuned with Subaru BRZ models from 2013-2020, Subaru Impreza 2012 – 2021, Subaru Crosstrek 2013 – 2021, Subaru Crosstrek Hybrid 2014 – 2021, and Subaru Ascent 2019 – 2021.
The intelligent molecules of this oil stick with every metal component of your engine from these Subaru models and keep them well-lubricated. Indeed, it forms an extra layer of protection when you start your car to protect it from wear.
Therefore, the synthetic base oil delivers unmatched protection against viscosity breakdown, sludge build-up, and wear. All of these reduce engine stress and increase fuel economy.
- Provide superior wear protection on critical engine parts
- Reduce engine wear dramatically
- Improve fuel economy
- A few users complain about getting a leaked oil container.
This synthetic oil performs the best under extremely cold temperatures. And that’s why most vehicle owners choose this oil for their cars. The price point is another factor that pushes car owners to go for it. Therefore, users are pleased with the performance of the oil as it delivers a better coating of the gears. However, some consumers complain they get the oil-soaked box.
10. Pennzoil Ultra Platinum Full Synthetic 0W-20 Motor Oil: Best Oil For Subaru Forester 2011-21
Design to handle extreme weather conditions! This is what resembles the Pennzoil Ultra Platinum Full Synthetic 0W-20 Oil best. Unlike other engine oils, it delivers low-temperature oil flow in extremely cold weather (down to -40ºF) and protects your engine against oil oxidation in excessive high-heat conditions.
That’s the reason this full synthetic oil works well with Subaru Forester 2011-21 models, Subaru Legacy & Outback 2013 – 2021 models, and Subaru Legacy & Outback XT (Turbo) 2020 – 2021 models.
The special additive this oil includes keeps the pistons clean dramatically. It protects your car engine against wear, sludge, and deposits. Indeed, this oil reduces engine pressure by lubricating every critical part of your engine from these models and increases overall performance.
Turns out, this oil also delivers unsurpassed protection against sludge and keeps the engine as close as to the factory clean.
- Boost up engine performance
- Provide ultimate wear protection
- Reduce engine pressure and increase fuel economy
- It has no foil seal once you remove the cap, which may leak the oil.
It just outperforms other conventional as well as some synthetic oils. The users can go past 5K miles or over between oil change intervals. Therefore, car owners find this 5-quart oil bottle with an ergonomic design easy to pour oil. The only downside is- some consumers get a leaky oil container.
Before going for the engine oil, consider the oil viscosity into account. Then, take a look at the following criteria to pick the right oil for your Subaru.
What Oil is Recommended for WRX?
Actually, it depends on the model and year of the Subaru WRX you own. For example, Subaru Forester 2002 – 2010 requires 5W-30 Conventional Oil/5W-40 full synthetic oil. On the other hand, Subaru Forester 2011 – 2021 needs 0W-20 Synthetic Oil. Check out the buying guide section above to learn about the oil types every Subaru WRX takes.
What Brand of Oil does Subaru Recommend?
Subaru recommends the Subaru Synthetic 5W-30 & 0W-20 Motor Oil itself to let the engine run quietly and smoothly. However, you can also go for other synthetic oil that comes from Royal Purple, Castrol, Valvoline, and more.
Subaru WRX Oil Recommended by Mileage
Check out the below chart to see what oil you should pour into the engine by mileage.
|Oil Type||Mileage||Oil brand||Oil Type||Mileage||Oil brand|
|Synthetic Oil||0-75,000||Castrol 03084C Edge 5W-30 Advanced Full Synthetic Motor Oil||Semi-Synthetic||0-75,000||Shell Rotella T5 15W-40|
|75,000-150,000||Valvoline Advanced Full Synthetic SAE 5W-30 Motor Oil||75,000-150,000||Havoline 5W30 High Mileage Synthetic Blend|
|150,000-300,000||Mobil 1 Advanced Full Synthetic Motor Oil 5W-30||150,000-300,000||Castrol 06440 GTX 5W-30 High Mileage Motor Oil|
How To Enhance Subaru Engine Life
Follow the below tips to maintain and enhance the engine life of your Subaru.
- Change the engine oil time with the right one
- Install a new free-flow exhaust system replacing the factory exhaust system
- Install a new air-intake system
- Check the fluid level and refill the engine when needed
- Let the engine warm-up
How To Change Subaru Engine Oil
Follow the step-by-step guide to change the engine oil of your Subaru.
- Lift up your vehicle using jack stands or ramps
- Use basic hand tools to remove the plastic undertray by unscrewing nuts and bolts.
- Put the drain pan under the drain plug. Then, unscrew it with a wrench and drain the oil.
- Remove the oil filter
- Replace the oil filter and reinstall the drain plug
- Refill your engine with full synthetic oil according to the car’s manual
- Finally, check the oil level.
What oil should I run in my 2018 WRX?
2018 Subaru WRX requires 5W-30 Synthetic Oil to run the engine smoothly.
What oil should I use for the 2015 WRX?
You should use SAE 5W-30 Synthetic oil for your 2015 Subaru WRX.
Which is better 5w30 or 5w40 for Subaru?
Subaru always recommends 5W-30 synthetic oil instead of 5W-40 to protect the engine against sludge, wear, and deposits. So, 5W-30 is better than 5W-40 for Subaru.
What oil should I use for my 2002 WRX?
2002 Subaru WRX requires 5W-30 Synthetic Oil to allow the engine to run smoothly and quietly.
What oil does a 2003 WRX take?
Like the 2002 WRX, the 2003 Subaru WRX also requires 5W-30 full synthetic oil to run the engine optimally.
How many quarts does 02 WRX take?
The oil capacity of the 2002 Subaru WRX is 4.8 quarts.
Is Pennzoil good for Subaru engines?
Yes, Pennzoil is good for Subaru engines. Its advanced additive will help to reduce engine wear by lubricating every moving part of your engine.
Does Subaru recommend synthetic oil?
Yes, Subaru recommends synthetic oil.
Does Subaru require special oil?
No, you don’t need to pour special oil in the Subaru. Subaru recommends pouring full synthetic as well as conventional oil to run the engine smoothly.
Should I use Subaru oil?
Yes, it is the best oil for Subaru WRX as Subaru oil is specially formulated for Subaru engines.
Should I use conventional oil in my Subaru?
Yes, you can use conventional oil in your Subaru.
Based on the manual guide of Subaru, we reviewed the 9 best oil for WRX. So, you can go for any oils from the above to let your engine run smoothly.
However, we recommend the Subaru SAE 5W-30 Engine Oil best. We suggest it highly as it comes from the Subaru itself and is specially designed for only Subaru cars.
As a result, you will get the best performance out of this oil, and it protects your engine against wear, rust, and sludge optimally.