Review on Bar's Leaks HG-1-4PK: Head Seal Blown Head Gasket Repair 🔧 - 33.8 oz (4 Pack) - Ultimate Fix for Head Gasket Issues! by Paul Tucker

Used on a 2004 Chevy Impala with a leaking head gasket. The car ran out of coolant and overheated after about 20-30 miles before needing topping up. I was skeptical but the cost of replacing the head gasket was way more than the car was worth. So I had nothing to lose other than the cost of buying this product. Following the instructions seems to have solved the problem - for now. I've driven the car about 500 miles since the treatment and it hasn't overheated yet. As far as I know the coolant level in the reservoir has not dropped. In my situation it was worth a try and it seems to have paid off.