sorry just trying to remember everything that is wrong it knock when it is started does this for about 5-10 min then runs fine ont time the knocking wouldnt stop but i added lucas and now it just does it when it is started also occasionally it will misfire cyl 4 or6 and the whole car shakes but it stops and runs fine after its warmed up. also mysterious coolant loss but oil still look good. i want to know if you think it is worth having my bf do the head gaskets.