typical 1.3/1.4 oil burning and crank journal wear, most of mine drank oil and had low oil pressure.
white smoke is probably just the weather conditions ?
and i could,nt live with engine vibration personally, i left the stock side mounts that carry the weight of the engine and then filled the...
thats the point of the self learn ecu,s on the coilpack engines, as the sensors go out of sync with age, the ecu compensates to a degree
hence the need to calibrate a new sensor when its fitted (pedal dance or reboot or whatever)
on the pre 2000 k11,s ed used to switch about 4 pinouts inside the ecu, if k12,s are the same then that would be the easiest route
nissan switched the wires to stop anyone swapping a prenats ecu in to steal the car