Subaru FA24F RTV Problems: Should Owners Be Concerned?

Subaru has long been known for its all wheel drive and turbo engine performance. Ask anyone why they bought a Subaru, and will most likely tell you it’s because of the all wheel drive (AWD) system. But what is all this chatter about Subaru FA24F RTV problems?

There have been reports circulating on the internet about Subaru FA24F engine and RTV problems. Specifically with the occurrence of RTV bits breaking off and entering the oil pan. This defect can allegedly cause oil starvation issues, and engine failure.

Now if that doesn’t sound confidence inspiring to you, we feel your pain! RTV pieces entering the oil pan isn’t ideal, and could potentially lead to oil starvation issues.

It’s like putting pineapple on a pizza – RTV doesn’t belong in the oil pan either!

So, should Subaru owners with the FA24F engine be concerned, and what does this all mean?

We hear your worries, and understand that it’s natural to feel a bit anxious about spending your hard earned dollars on a vehicle you thought would be reliable for years to come.

Let’s dig a little deeper into the Subaru FA24F RTV problems. We will investigate whether it is something that owners should be genuinely worried about.

Subaru FA24F RTV Problems: Myth or Reality?

The problem with RTV sealant began to emerge with the second-generation Subaru BRZ and Toyota GR86. These vehicles were equipped with the FA24D H4 engine.

At the time, owners began to report of excessive RTV sealant breaking off and clogging the oil pickup tube. This would lead to alleged engine failure due to restricted oil flow.

This was particularly the case when the vehicles had been modified and/or seen hard use on a road course or autocross. Increased oil demand, high-g cornering, increased heat – it all pushes the limits of the vehicle and exposes mechanical issues that may have never of happened daily driving.

As one can imagine, the internet was set on fire over the discovery. And well, rightfully so, both Subaru and Toyota market these vehicles as capable high-performance vehicles.

In fact, Toyota even provides a free track day when you purchase a new GR86. Which, if I’m honest, is pretty cool Toyota.

So by now, it’s well known that Subaru and Toyota vehicles equipped with the FA24D H4 engine have had their share of RTV issues. It’s well documented on the internet forums, and even a class action investigation into the problem.

Understanding the Subaru FA24F RTV Gasket Problem

To comprehend the issue at hand, let’s dive into the role of the RTV gasket. Simply put, the RTV gasket is a sealant used to create a bond between the oil pan and engine block. The RTV’s sole job is the ensure a nice tight, and leak-free seal.

However, some Subaru owners have reported finding small bits of RTV material in their oil pans. Even on their oil dipsticks.

Finding RTV on the oil dipstick is never normal, and is an indication of a potential problem. And naturally, this has led to concerns about these fragments breaking off and clogging the oil pickup tube.

Differences Between Oil Pickup Tubes

Now, the question is: does the Subaru FA24F engine found in the Subaru Ascent, Outback XT, Legacy GT, and WRX suffer from the same RTV problem?

Given that the same robotic RTV process was used on the FA24F engine as was the FA24D, it’s certainly a possibility, right?

Well yes, but it’s not much of a concern as before. And here’s why.

After much research, we found that the oil pickup tube has been redesigned. The flat mesh-like design, with only one screen to do the job of filtering debris, has been replaced with a multi screen box design.

The Subaru FA24F engine features a “box” design oil pickup tube that features five different screens. With the redesigned oil pickup tube, there is enough surface area for the oil to maintain a steady flow, even with RTV debris.

The earlier “flat” design allegedly clogged easily due RTV bits. After examining this design, it’s easy to see how this could happen.

However, the new “box” design can manage RTV bits without clogging. Simply put, the new boxed design oil pickup tube found in the FA24F engine keeps the oil flowing despite RTV bits occupying the oil pan.

Simply put, the oil is able to flow into the box, and maneuver around any potential blockage.

Keep in mind, the top section of the box can still reportedly become clogged. But, the sides of the box allow the oil to circulate up into the engine.

This is a big deal, and more than likely Subaru redesigned the oil pickup due to earlier FA24D engine failures.

Does RTV Debris Cause Oil Starvation Problems?

It is important to note that there has been no conclusive evidence linking the presence of RTV material to engine oil starvation with the FA24F engine.

In reality, having large pieces of dried RTV floating in the oil pan is less than ideal. During intense usage scenarios like a track day, it can significantly impede oil flow. However, during regular daily driving conditions, it poses no significant threat.

It’s possible Subaru is aware of RTV entering the oil pan, and why the oil pickup tube was redesigned.

Assessing the Severity of RTV in The Oil Pan. Should You be Concerned?

While any issue with a vehicle’s engine can be worrisome, it is crucial to consider the severity of the Subaru FA24F RTV problems.

Fact is, Subaru hasn’t acknowledged the presence of RTV material in the oil pan, or the risk it may cause to the engine. Subaru has however, taken steps to rectify the situation with the redesigned oil pickup tube.

And while some may have experienced RTV material in the oil pan, the majority have not observed any adverse effects on their vehicle’s performance or engine longevity.

This may suggests that the problem may be isolated to a specific batch or a small number of Subaru and Toyota vehicles.

However, this may change as owners begin to rack up the miles.

Preventive Measures and Long-Term Implications

Subaru’s proactive approach to this issue should reassure owners. Regular maintenance visits to authorized Subaru service centers can help identify and resolve any potential RTV-related concerns.

During these visits, ask the technician to inspect the oil for RTV pieces. And if the tech discovers a concerning about of RTV on the dipstick, it may warrant pulling the oil pan.

Subaru technicians should flush the oil system, removing as many remnants of the RTV material as possible. This will minimizing the risk of long-term damage, without having to pull the oil pan.

Our advice: if you own or thinking of purchasing a Subaru or Toyota with the FA24F engine, make sure oil changes are performed in a timely manner, and only at authorized Subaru dealerships.

Keep all records of oil changes in case you need to file a warranty claim.

Will Modifications Accelerate The Subaru RTV Issue?

For Subaru owners who heavily modify their vehicles, there are additional considerations and risks to be mindful of.

Truth is, modifying the engine may accelerate the risk of RTV breaking and falling into the oil pan. Additionally, racing or autocrossing your Subaru with a FA24F engine could potentially cause excessive RTV to collect into the oil pickup tube.

Therefore, owners who modify or race their Subaru’s should be aware of the risks and potential impact on their warranty coverage.

But, if you daily drive your Subaru with the FA24F engine, and maintain the oil, their is no need to worry.

Which Subaru Models Come With The FA24F Engine?

Several Subaru models are equipped with the FA24F engine. These include the 2019 and newer Subaru Ascent, the 2020 and newer Subaru Legacy XT, the 2020 and newer Subaru Outback XT, the 2022 and newer Subaru WRX.

Worth noting, the 2022 and newer Subaru Levorg, which is available exclusively in Europe, Asia, New Zealand, and Australia also features the FA24F engine.

Subaru FA24F RTV Problems FAQs

Does WRX have RTV issue?

The 2022 WRX allegedly does have an RTV issue, with owners finding bits of RTV on their oil dipsticks, or in their oil pans. However, the new “box” design of the oil pickup tube allows oil to flow despite having these debris stuck to the screens.

Has Subaru Fixed The RTV issue?

Yes, the RTV issue was solved for the 2022 models by updating the design of oil pick up tube. Instead of a flat, single mesh screen, the new “box” design oil pickup tube features five different screens.

How long does RTV last?

RTV Silicones offer a remarkable lifespan of 40 years and possess exceptional elongation capabilities. They exhibit effortless dispensing, even in cold temperatures, while also being compliant with VOC regulations. Furthermore, they boast outstanding UV and thermal stability properties.

Can RTV damage the engine?

Yes, applying too much RTV sealant can result in excess material being squeezed out, which can enter the engine and potentially cause blockages or interfere with moving parts.

Is RTV better than a gasket?

Yes, RTV sealant is generally better than traditional gaskets in some cases. Unlike gaskets, which often require precise machining or fitting to ensure proper alignment and sealing, RTV can be applied more freely.

The flexibility of RTV allows it to conform to irregular surfaces, gaps, or complex geometries, providing a custom seal.

Truth is, the versatility of RTV makes it suitable for applications where gaskets may be challenging to install or not readily available in the required dimensions.

Does RTV float in oil?

Pieces of dried RTV sealer will float or sink when placed in oil, as RTV will not dissolve in hot oil. Instead, debris will float, potentially clogging a passage or screen.

Final Thoughts: Subaru FA24F RTV Problems

While reports of RTV material in the oil pan of various Subaru models has caused concerns among owners, the overall severity of the issue appears to be relatively low.

Thankfully, the Subaru FA24F engine uses a new oil pickup tube design. The problematic flat, single screen version is long gone.

Specifically the new box oil pickup tube features five different screens. This bolstered filtering system ensures that there is enough surface area for the oil to continue flowing. Even if any RTV debris entered the oil pan.

The additional safety measure provides an assurance and peace of mind for current and potential owners. For current owners, ensure regular oil changes, preferably performed by a Subaru dealership.

We hope we answered your question about the Subaru FA24F RTV problems. By now, you should have a better understanding of what’s going on with these engines.

Did we miss anything? If so, drop us a comment below👇 we’d love to hear from you!