Steel Seal Head Gasket Sealer 16 oz for 4 cylinder cars Product Description DOES YOUR VEHICLE HAVE A BLOWN HEAD GASKET? White smoke coming out of your car's tailpipe? Is there water in your car's oil? Is your engine overheating? Coolant squirting out of spark plugs? Is there back pressure or bubbling in your car's radiator? External leaks and leaking freeze plugs? These are all classic symptoms of a broken head gasket. Ignoring these symptoms can lead to a costly repair bill. Pretreatment Head gasket failure is a symptom, not the cause of overheating. The original source of cooling system failure, if still present, must be repaired before attempting to repair your head gasket. **STEEL SEAL IS NOT COMPATIBLE WITH All ANTIFREEZE FORMULATIONS** Therefore, for best results, coolant should be temporarily drained and replaced with distilled water. Once repaired, drain Steel Seal from the cooling system and replace with 50/50 antifreeze. You may have to do additional steps if you have bubbling in the radiator or back pressure. Read carefully before starting the repair. Call us if you need assistance. Water in oil If water is present, you must change the oil and filter before proceeding. Change oil and leave one quart low. Add last quart after the repair is complete. Returns to this seller are only for unused products. This seller does not warranty the product in any way if used. TREATMENT STEPS STEP 1 Make sure engine is cold and remove the radiator cap. Pour Steel Seal directly into the radiator. Replace radiator cap and tighten. STEP 2 If vehicle is roadworthy: Start engine and drive at freeway speeds for 5 miles, maintaining between 3,000 - 4,000 RPM, then shut off engine. If vehicle is not roadworthy: Turn heater and fan to maximum. Start engine, run to operating temperature and then run on high idle (1,000 - 1,500 RPM) for 30 minutes. Turn off vehicle and allow to cool completely. Top up with antifreeze/water as necessary, replace radiator cap tightly. STEP 3 Leave the Steel Seal in your system and drive the vehicle as usual. If treatment has been carried out with only water replace coolant once repair is complete.