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Subaru 2.5L Engines are Known for Cooling Problems

What You Need to Know About This Article

  • Subaru 2.5L engines have a mixed history of cooling, head gasket and oil leaks
  • There are specific ways to test a Subaru 2.5L engine for leaks, and not all testing methods provide reliable results.

  • There’s a difference between OEM and aftermarket parts for Subaru engines
  • Bar’s Leaks products have helped hundreds of thousands of Subaru owners insure against and solve cooling system, head gasket and oil leaks

Out on the open road, a vehicle’s engine can get mighty hot amidst the high speeds and sharp inclines of freeways and steep terrains. Under the hood of each car lies a series of complex components, some of which heat up in the process of powering the engine, and others that exist to counter these effects and prevent things from overheating. From the thermostat and fans to the radiator and coolant reservoir, each part relies on the other to keep the engine cool for safe driving.

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What are Some Symptoms of a Blown Head Gasket?

HG-1-Box-PNGA blown head gasket is a major problem. It can starve your engine of the coolant it needs to keep from overheating, and it can allow your coolant and oil to mix. Once that happens, if you continue driving, your engine can suffer catastrophic failure, making it undriveable.

At that point, the only solution is an expensive engine rebuild or replacement. Thankfully, Bar’s Leaks exists to prevent that from happening. Our proven products are easy to use — and you don’t need to be a mechanic or car expert.

The most important thing to do is identify a problem with your head gasket before it becomes a major leak. Here are some of the most telltale symptoms something is not right with the head gasket:

  • Coolant loss: While coolant loss can come from different causes, a leak in the head gasket will result in a loss of coolant. This can be small at first, so it’s always a good idea to frequently check your coolant level.
  • Cloudy coolant in the tank: If you see a cloudy, milky appearance to the coolant in the reservoir, it means oil is getting in there. That’s another obvious sign of head gasket problems.
  • White smoke from your tailpipe: The presence of noticeable white smoke coming from your tailpipe is likely the result of coolant getting into your combustion chamber, again a sign of a head gasket leak.
  • Air bubbles in your radiator: With the radiator cap removed (always be careful, especially when hot!), you may be able to see signs of a cylinder head gasket leak with the presence of air bubbles.
  • Visible leaks: After driving your car, pop your hood and look for any leaks between the cylinder head and the block. Use a flashlight and small mirror to inspect the hard-to-reach areas.
  • Rough driving / hesitation: If you get to the point where your car is running rough, it means you already have some pretty serious head gasket damage. Time to react!

Once you’ve determined you have a blown head gasket, you have no time to waste. At the earliest moment possible, you’ll want to add our Bar’s Leaks HG-1 (Blown Head Gasket Repair) product. It is guaranteed to stop mild to moderate coolant leaks — and at the fraction of the price of a replaced cylinder head gasket. This is especially comforting for owners of older vehicles, where the cost of gasket replacement surpasses the cost of the vehicle itself.

Before your next drive, check your coolant level and the appearance of your coolant in the reservoir or radiator. Then watch for the various symptoms of a blown head gasket when you’re out on the road. At the first sign of a problem, you can always ask a mechanic to check out your engine and confirm your cylinder head gasket leak.

If you have a leak, a bottle of Bar’s Leak HG-1 is all it takes to get you back on the road. With almost 70 years in the business and proven technology in every bottle, Bar’s Leaks is the smart, easy and affordable solution to your blown head gasket. Now that you know the symptoms of a blown head gasket, you can detect one before it comes a problem and apply the guaranteed solution: Bar’s Leaks!

Symptoms of a Blown Head Gasket

Symptoms of a Blown Head Gasket

The majority of today’s engines consist of a four-stroke design that utilizes three fluids: combustible air fuel, water/glycol coolant and motor oil. None of these fluids can ever come into contact with each other. To ensure these fluids are properly routed between components with no intermixing, there’s the head gasket.

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Take Care of Hidden Oil Burning and Reduce Your Oil Consumption—and Cost

Take Care of Hidden Oil Burning and Reduce Your Oil Consumption—and Cost

Sure, you’re busy. Everyone is these days Still, there are times when it pays to slow down and take note— like when you notice your oil levels are continually low and you have to top off between service intervals. Cars that burn oil because of leaks are no fun, but if you don’t deal with them right away they could cost you big time. Not only do you risk spending more on oil, but internal oil leaks can cause the clutch to slip in a manual transmission, produce undesirable odors if oil drips onto a hot exhaust manifold or pipe, and cause engine failure. Bottom line: burning oil or small, internal oil leaks mean you’ll consume more oil—and pay for it.

From an environmental perspective, oil consumption in general causes air pollution in the form of hydrocarbons and particulates, the latter consisting of undesirable matter such as dust, soil, acids, and metals and organic chemicals, which travel through the exhaust into the atmosphere. If your car is consuming more oil, it’s probably emitting higher than normal levels of pollution. In addition, most oil preservatives degrade the effectiveness of catalytic converters and oxygen sensors, so if your car is consuming (burning) preservative-laced oil, the catalytic converter will underperform.

According to the Environmental Protection Agency, cars are major culprits in the production of air pollutants in the U.S. They are responsible for about one-half of volatile organic compound (VOC), nitrogen oxide and particulate matter emissions, and seventy-five percent of carbon monoxide emissions. In cities, car emissions cause between fifty-and-ninety percent of all air pollution. Oil consumption doesn’t cause all of this pollution, but it is a contributing factor, which is another reason to fix oil leaks and reduce the amount of oil your car consumes.

Ok, tending to an oil consumption/burning problem early is good practice, but isn’t that work for a highly trained, experienced mechanic? Read More

Oil Usage Still a Problem with Modern Engines

Here’s the truth: oil usage has pretty much always been a problem.
Thinking back to the old days, a gas station would wash your window and check your oil levels, among other things.  If you had low oil levels, they offered to top it off.
Now fast forward to the 70’s through 90’s.  With drivers changing their oil every 3,000 miles and not really checking oil levels often, this did not cause a major issue when they were down a quart or quart and a half. If you were not checking your oil, you did not know it was low, so never realized you had an issue. General oil usage advice says that if a car does not use more than a quart per 1,000 miles, things are considered normal. Back in the 90’s when this advice was issued, it did not sit well with most consumers, but it was pretty much standard policy with all automakers.
Now today we have oil change intervals that are much longer, from 5,000 miles with normal being 7,500 to 10,000 miles. Others are even longer. So you can imagine if you are using a quart per 1,000 miles, you are consuming a lot of oil in between oil changes, or even running the engine on the dry side. Recent research shows that if you are towing or using the vehicle in what is considered heavy duty service (which applies a lot of us), you are consuming a quart at 750 miles or even 500 miles for some vehicles. With all of that said, there are other factors actually causing an increase of oil usage in newer engines.
For the most part, today‘s engines are made much better than before – but they are using more oil.  A few of the common reasons are thinner motor oil, synthetic oil (still a big debate if this actually causes leaks but seems to), lighter-weight engine components, low tension piston rings to reduce friction, more power out of smaller hotter running engines with power adders like turbocharging and supercharging. And sometimes, it’s just a manufacturing defect/design issue.
bar's leaks burning oil leak
Our Bar’s Leaks Valve Seal Oil Consumption Repair can help with many of these issues except (for the most part) manufacturing design defects.
Smaller, hotter-running engines are causing valve stem seals to fail, and this is a big issue that we hear about every week.  Plus most modern engines have twice as many valves per cylinder — 4 instead of 2 — than older engines, which makes the oil usage problem even worse.  And with low-tension rings, any type of carbon or gunk on the rings will make them stick, which can cause oil burning. Bar’s Leaks Valve Seal Oil Consumption Repair has a really good detergent package plus other very proven, reliable ingredients that clean up rings and piston grooves.  The product’s viscosity modifier and tackifier helps keep oil from going by piston rings, pistons, and valve seals while making the motor oil a little thicker. And the product works in all cars, so it’s a universal solution to a common problem.
Have questions? Feel free to contact us and we’ll be happy to help you out.