I posted this in 2nd gen also. Anyone used this product to fix a leaky head gasket.My 01 has developed a small leak on the head just below the t-stat housing.They guarantee it to work but a little pricey($42 a bottle and it will require 2 for the 5.9)

 

Just go ahead bit the bullet and do the headgasket. The sealer may work but only for just a little while.