in order to make this easyer lets use this diagram as a guide
now which ports on the coil pack that does not fire?? are those C and D?? if so then check the wiring to the coil pack, their is a little socket on the back of it with some 3 or 4 wires... check if they are all in a good condition.
this socket delevires the signal from the ECU to the coil pack to order it to fire, if you miss that signal the coil pack won't fire and from what you discribed you are missing the signal to the lower part of the coil pack.
also this could be a faulty coil pack, if you got a spare or can borrow one from a friend, swap it with your pack and test the car to make sure wether it is a coil pack or signal problem before you spend money on parts you don't want.
this is by far the most strange thing i ever heared, complete oil loss is associated with loss of pressure, period.i have no oil watsoever in the car , have no clue Y ?, it had oil yesterday b4 i took the car out ? wats weird is no oil psi drop showed up in the stock cluster or in the aftermarket gauge
you were leaking oil from the turbo but will that use up all your oil? i don't think so especially that you say you checked the oil a day before.
i suppose you would have noticed an oil leak under the car (assuming you have one) especially when it leaks 3.50 liters on the street, with all feedback you say i am really confused.
try to drain all the oil in the engine in a contaner and see for real how much oil is their, if you got no dip stick reading and no oil pressure loss whatsoever then your dip stick is just stupid. maybe you did lose lots of oil some how but not much to cause oil pressure drop... again i am confused with that so you won't be sure till you drain the oil and see how much oil you got in their for real.
sorry for your problems bro.
MMamdouh