{"title":"Subaru EJ25 Head Gasket Repair","description":"\u003ch2\u003eSubaru EJ25 Head Gasket Failure: Causes, Symptoms \u0026amp; Fix Options\u003c\/h2\u003e\u003cp\u003eThe Subaru EJ25 engine (found in the Outback, Legacy, Forester, and Impreza) is well known for head gasket failures, especially in models from the late 1990s through the mid-2000s. Common warning signs include external coolant leaks near the heads, coolant loss with no visible puddle, overheating, white smoke from the exhaust, and a sweet coolant smell from the tailpipe.\u003c\/p\u003e\u003cp\u003eA full head gasket replacement on an EJ25 typically means pulling the heads off the engine, which can cost $1,500–$2,500+ in labor and parts at a shop. Thermagasket offers a chemical alternative: a two-part sealant introduced through the cooling system that bonds to the leak at the gasket surface, sealing it in under 30 minutes without removing the heads.\u003c\/p\u003e\u003cp\u003eThermagasket is compatible with the EJ25's aluminum heads and cast engine components, and works whether the leak is internal (coolant into the combustion chamber) or external (coolant seeping between the head and block).\u003c\/p\u003e\u003ch3\u003eRecommended products for Subaru EJ25 head gasket leaks:\u003c\/h3\u003e","products":[{"product_id":"thermagasket-head-and-block-treatment-kit","title":"Thermagasket Head and Block Treatment Kit","description":"\u003cp data-mce-fragment=\"1\"\u003e\u003cspan class=\"\"\u003eThermagasket is 2-part, Ceramic Fiber, Elemental Carbon and Iron Metallic Alloy compound. EFFECTIVELY Seals Blown Head Gaskets, Cracked Heads and or Blocks in all aluminum, steel, and cast iron engines. We will refund your money if we are not able to successfully help you with the repair. Thermagasket is the most effective blown head gasket repair on the market today! 100% effective. All orders ship within 24 hours.\u003c\/span\u003e\u003c\/p\u003e\n\u003cul data-mce-fragment=\"1\"\u003e\n\u003cli data-mce-fragment=\"1\"\u003eSeals your head gasket in less than 10 minutes!\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eNo Mechanic Needed. Do It Yourself!\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eSave Thousands Over Conventional Repairs\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eDeveloped by Automobile and Chemistry Experts\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-mce-fragment=\"1\"\u003e16 oz Part A Base\u003cbr data-mce-fragment=\"1\"\u003e8 oz Part B Catalyst\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eCARS- 100 EFFECTIVE\u003c\/p\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eSolves the following problems:\u003c\/h3\u003e\n\u003cul data-mce-fragment=\"1\"\u003e\n\u003cli data-mce-fragment=\"1\"\u003eFailing or completely failed head gasket\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eWarped heads\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eCracked engine blocks and heads\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eCoolant leaks between the head and block\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eIntake manifold coolant leaks\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eOverheating due to a cracked head or block\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eOil leaks into the cooling system (radiator)\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eCoolant leaks into the oil\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eExcessive steam and water from the tailpipe\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-mce-fragment=\"1\"\u003eMost head gasket failures are caused by engine overheating. If you’re not sure why your engine overheated, review a shortlist of the most common causes below.\u003c\/p\u003e\n\u003cdiv class=\"wpb_column vc_column_container vc_col-sm-6\" data-mce-fragment=\"1\"\u003e\n\u003cdiv class=\"vc_column-inner\" data-mce-fragment=\"1\"\u003e\n\u003cdiv class=\"wpb_wrapper\" data-mce-fragment=\"1\"\u003e\n\u003cdiv class=\"wpb_text_column wpb_content_element\" data-mce-fragment=\"1\"\u003e\n\u003cdiv class=\"wpb_wrapper\" data-mce-fragment=\"1\"\u003e\n\u003cdiv class=\"question-list\" data-mce-fragment=\"1\"\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eSudden Overheating:\u003c\/h3\u003e\n\u003cul data-mce-fragment=\"1\"\u003e\n\u003cli data-mce-fragment=\"1\"\u003eDefective Thermostat\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eDefective Electric or Clutch Type Cooling Fan\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eCooling System Leak\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"wpb_column vc_column_container vc_col-sm-6\" data-mce-fragment=\"1\"\u003e\n\u003cdiv class=\"vc_column-inner\" data-mce-fragment=\"1\"\u003e\n\u003cdiv class=\"wpb_wrapper\" data-mce-fragment=\"1\"\u003e\n\u003cdiv class=\"wpb_text_column wpb_content_element\" data-mce-fragment=\"1\"\u003e\n\u003cdiv class=\"wpb_wrapper\" data-mce-fragment=\"1\"\u003e\n\u003cdiv class=\"question-list\" data-mce-fragment=\"1\"\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eRecurring Overheating:\u003c\/h3\u003e\n\u003cul data-mce-fragment=\"1\"\u003e\n\u003cli data-mce-fragment=\"1\"\u003eDefective Radiator Cap – not maintaining proper pressure in the cooling system\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eDefective Electric or Clutch Type Cooling Fan\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003ePlugged Radiator or Heater Core\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eSticking Thermostat\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eCooling System Leak\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eWhat is a blown head gasket?\u003c\/h3\u003e\n\u003cp data-mce-fragment=\"1\"\u003eA blown head gasket is a breach in the gasket whose purpose is to form a gas-tight seal between the cylinder head and the engine block. This type of breach typically occurs in cars that have severely overheated. During severe overheating, the head or block warps, causing it to pull away from the gasket. The unsupported gasket fails under the high pressure of combustion or heat from the cooling system. Once the gasket is penetrated, exhaust gases escape from the cylinders into water cooling ports and often into adjacent oil ports. When this occurs, the cooling system malfunctions, resulting in the engine overheating.\u003c\/p\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eWhat are the symptoms of a blown head gasket?\u003c\/h3\u003e\n\u003cp data-mce-fragment=\"1\"\u003eThe most visible sign of a blown head gasket is steam visible from the tailpipe after the car has warmed up. However, many cars with minor damage to the head gasket don’t show any visual indicators. In this case, the cooling system must be checked for the presence of exhaust gases.\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eAnother symptom frequently encountered is the presence of water in the oil. It appears as a milky white emulsion under the oil cap and on the dipstick.\u003c\/p\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eHow does Thermagasket work?\u003c\/h3\u003e\n\u003cp data-mce-fragment=\"1\"\u003eWhenever there is a breach in the head gasket, a cracked head, or a cracked block, a hot spot develops at the point of the breach. That hot spot can reach temperatures 3 to 4 times that of normal engine operating temperatures. When Thermagasket comes into contact with this superheated area, it instantly forms a perfect high-temperature seal. Once Thermagasket’s metallic alloys seal the breach, heat is deflected away from the patch, eliminating the hot spot and preserving the long term integrity of the repair.\u003c\/p\u003e","brand":"thermagasket-a2b9","offers":[{"title":"Default Title","offer_id":42670530986141,"sku":"","price":79.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0618\/1188\/4189\/files\/Thermagasket_Head_and_Block_Treatment_Kit.png?v=1780512801"},{"product_id":"thermagasket-extreme-duty-head-block-sealant-large-capacity","title":"Thermagasket Extreme Duty Head \u0026 Block Sealant","description":"\u003cp\u003eThermagasket Extreme Duty Head \u0026amp; Block Sealant Large Capacity is a professional-grade engine repair solution specifically engineered for large-capacity gasoline and diesel engines with cooling systems exceeding 7 gallons.\u003c\/p\u003e\n\u003cp\u003eThis advanced two-part formula combines a 32 oz Extreme Duty Base Formula (Part A) with a 16 oz Catalyst (Part B) to create a powerful sealing system designed to repair and seal:\u003c\/p\u003e\n\u003cp\u003e✓ Blown head gaskets\u003cbr\u003e✓ Cracked cylinder heads\u003cbr\u003e✓ Engine block leaks\u003cbr\u003e✓ Coolant loss issues\u003cbr\u003e✓ Internal coolant leaks\u003cbr\u003e✓ Combustion gas leaks\u003c\/p\u003e\n\u003cp\u003eUnlike temporary stop-leak products, Thermagasket Extreme Duty is formulated for demanding applications found in heavy-duty trucks, commercial vehicles, diesel pickups, industrial equipment, RVs, and large-displacement engines.\u003c\/p\u003e\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eDesigned for engines with 7-gallon cooling system capacity or larger\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eCompatible with both gasoline and diesel engines\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eProfessional-strength two-part sealing technology\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eHelps restore engine performance and cooling system integrity\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eIdeal for heavy-duty, commercial, towing, and high-load applications\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eEasy-to-follow application process\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e32 oz Thermagasket Extreme Duty Formula (Part A)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e16 oz Thermagasket Catalyst (Part B)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eIf you're searching for a reliable head gasket repair solution, engine block sealant, diesel head gasket sealer, or heavy-duty coolant leak repair, Thermagasket Extreme Duty delivers professional-grade performance for large-capacity engines.\u003c\/p\u003e","brand":"thermagasket-a2b9","offers":[{"title":"Default Title","offer_id":42670531903645,"sku":"","price":179.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0618\/1188\/4189\/files\/Thermagasket_Extreme_Duty_Head_Block_Sealant_Large_Capacity.png?v=1780512806"},{"product_id":"thermagasket-extreme-cooling-system-cleaner","title":"Thermagasket Extreme Cooling System Cleaner","description":"\u003cp\u003e\u003cspan style=\"font-weight: 400;\"\u003eIntroducing the Thermagasket Extreme Cooling System Cleaner, your ultimate solution for maintaining the pristine condition of your vehicle's cooling system. This highly concentrated 2oz formula is engineered to deliver a powerful cleaning action, capable of rejuvenating up to a 7-gallon cooling system.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eFeatures:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli style=\"font-weight: 400;\" aria-level=\"1\"\u003e\n\u003cstrong\u003eHighly Concentrated Formula\u003c\/strong\u003e\u003cspan style=\"font-weight: 400;\"\u003e: Just 2oz of Thermagasket Extreme Cleaner packs a potent punch, making it a cost-effective solution for comprehensive cooling system maintenance.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli style=\"font-weight: 400;\" aria-level=\"1\"\u003e\n\u003cstrong\u003eExtensive Cleaning Capacity\u003c\/strong\u003e\u003cspan style=\"font-weight: 400;\"\u003e: Designed to efficiently clean up to 7 gallons, this cleaner ensures thorough decontamination and removal of build-ups in your cooling system.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli style=\"font-weight: 400;\" aria-level=\"1\"\u003e\n\u003cstrong\u003eEasy to Use\u003c\/strong\u003e\u003cspan style=\"font-weight: 400;\"\u003e: Simplify your maintenance routine with this straightforward and user-friendly cleaner, suitable for professionals and DIY enthusiasts alike.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli style=\"font-weight: 400;\" aria-level=\"1\"\u003e\n\u003cstrong\u003eCompatibility\u003c\/strong\u003e\u003cspan style=\"font-weight: 400;\"\u003e: Ideal for use in a wide range of vehicle cooling systems, providing versatility and convenience for all users.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eBenefits:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli style=\"font-weight: 400;\" aria-level=\"1\"\u003e\n\u003cstrong\u003eEnhanced Cooling System Performance\u003c\/strong\u003e\u003cspan style=\"font-weight: 400;\"\u003e: By removing deposits and contaminants, this cleaner helps to restore optimal functionality to your cooling system.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli style=\"font-weight: 400;\" aria-level=\"1\"\u003e\n\u003cstrong\u003ePrevent Overheating\u003c\/strong\u003e\u003cspan style=\"font-weight: 400;\"\u003e: Regular use can prevent common cooling system issues, such as overheating, by maintaining a clean and efficient system.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli style=\"font-weight: 400;\" aria-level=\"1\"\u003e\n\u003cstrong\u003eLongevity\u003c\/strong\u003e\u003cspan style=\"font-weight: 400;\"\u003e: Keeping your cooling system clean can extend its life, reducing the need for costly repairs and replacements in the future.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cstrong\u003eIdeal for:\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli style=\"font-weight: 400;\" aria-level=\"1\"\u003e\n\u003cstrong\u003eAutomotive Enthusiasts\u003c\/strong\u003e\u003cspan style=\"font-weight: 400;\"\u003e: Ensure your vehicle is performing at its best with a clean and efficient cooling system.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli style=\"font-weight: 400;\" aria-level=\"1\"\u003e\n\u003cstrong\u003eProfessional Mechanics\u003c\/strong\u003e\u003cspan style=\"font-weight: 400;\"\u003e: Add value to your services by offering an effective cooling system cleaning solution.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli style=\"font-weight: 400;\" aria-level=\"1\"\u003e\n\u003cstrong\u003eDIY Car Maintenance\u003c\/strong\u003e\u003cspan style=\"font-weight: 400;\"\u003e: Take control of your vehicle's upkeep with an easy-to-use product that delivers professional results.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan style=\"font-weight: 400;\"\u003eElevate your vehicle maintenance with the Thermagasket Extreme Cooling System Cleaner. Say goodbye to contaminants and hello to a cleaner, more efficient cooling system today!\u003c\/span\u003e\u003c\/p\u003e","brand":"thermagasket-a2b9","offers":[{"title":"Default Title","offer_id":42670534688925,"sku":"","price":14.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0618\/1188\/4189\/files\/Thermagasket_Extreme_Cooling_System_Cleaner.png?v=1780512806"},{"product_id":"thermagasket-defender","title":"Thermagasket Defender – Head Gasket Preventive Treatment","description":"\u003cdiv class=\"page\" title=\"Page 1\"\u003e\n\u003cdiv class=\"layoutArea\"\u003e\n\u003cdiv class=\"column\"\u003e\n\u003ch1\u003eThermagasket Defender – Preventive Head Gasket Protection\u003c\/h1\u003e\n\u003ch2\u003eProtect Your Engine Before a Small Leak Becomes a Major Problem\u003c\/h2\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cstrong\u003eThermagasket Defender\u003c\/strong\u003e is designed for preventive maintenance in high-mileage vehicles and provides an additional layer of protection against \u003cstrong\u003ehead gasket leaks and failure\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003eMinor head gasket leaks can develop gradually and may go unnoticed for an extended period. Even a small leak can contribute to \u003cstrong\u003ecoolant loss, reduced fuel economy, poor engine performance and fluctuating engine temperatures\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003eFor preventive maintenance, Thermagasket Defender is recommended for use through the cooling system \u003cstrong\u003eevery 30,000 miles\u003c\/strong\u003e.\u003c\/p\u003e\n\u003ch2\u003eHelp Protect Against Head Gasket Failure\u003c\/h2\u003e\n\u003cp class=\"isSelectedEnd\"\u003eThermagasket Defender can also be used following a \u003cstrong\u003ehead gasket replacement\u003c\/strong\u003e as an additional layer of protection during engine break-in.\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003eEarly head gasket problems can occur after installation due to issues such as:\u003c\/p\u003e\n\u003cul data-spread=\"false\"\u003e\n\u003cli\u003eFaulty or damaged head gasket\u003c\/li\u003e\n\u003cli\u003eCylinder heads not surfaced correctly\u003c\/li\u003e\n\u003cli\u003eGasket becoming pinched during installation\u003c\/li\u003e\n\u003cli\u003eIncorrect head bolt torque specifications\u003c\/li\u003e\n\u003cli\u003eIncorrect torque sequence\u003c\/li\u003e\n\u003cli\u003eReuse of head bolts when replacement is required\u003c\/li\u003e\n\u003cli\u003eCooling system not being properly bled\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThermagasket Defender is formulated to help \u003cstrong\u003eseal imperfections between the cylinder head and engine block\u003c\/strong\u003e, providing added protection where minor sealing imperfections may otherwise contribute to coolant leakage (Thermagasket- Preventive Head Gasket Sealer )\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Thermagasket","offers":[{"title":"Default Title","offer_id":43749219532957,"sku":"","price":49.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0618\/1188\/4189\/files\/Thermagasket_Defender.png?v=1780523969"}],"url":"https:\/\/rxauto.com\/collections\/subaru-ej25-head-gasket-repair.oembed","provider":"Thermagasket","version":"1.0","type":"link"}