Got engine back together, but not back in. When I do drop it I was gonna put seafoam n..Any ever use this? I got some today and was wondering if its as good as it suppose to be? And it says to "pour it in crankcase(OIL)"? Would this be where pcv screen an gromet is? Or in actual oil fill neck? Put 3rd in gas, 3rd in oil and 3rd in vacuum line whats a good vac line for this to clean carbon build up? Think it said must go to all open ports