1- ngk genuine equivalent if car is stock 2- 15w40 mineral oil 3- the previous owner is an idiot, bov will be leaking under boost unless its been blocked off internally, put the hose back on. 4- yes, normal
Yeah I contacted you last year about these the pics u sent me of te inside looked very good. Not plaz or pw good but good enough id give one a go if the dyno backs it up.
Get it checked at ford or any workshop (if not in warranty) that has a scan tool that can read converter lockup solenoid pid, if its contaminated youl see the solenoid switching on and off while driving
You were lied to, all ba onwards falcons have twin pot fronts (unless brembo), they have differet sized rotors ba/bf, if yours is a ba it has the smaller 298mm (I think) rotors