Has anyone used this product with good results? I have a 1997 Taurus wagon with 3.0 Vulcan a $500 beater. A year ago , the car blew a radiator hose and overheated on the highway. Last fall, the service center told me it had a blown head gasket--the PH in the coolant was 8.5. (it loses about 4 oz of coolant in a month) I still drive the car daily and it has never overheated yet. This product came to my attention. It seems to be a one step liquid head gasket fix. It would be great if it helps me out--not so good if it clogs up the engine. Any thoughts?