I have a small factory with a “Fit Power Train” slot, and I’ve noticed that every 5 cars or so, around 5 or 6 engines will vanish from the local stockpile, even though only one engine is fitted to the car. If I look in “Imports” I can see that I’m importing around 10 PowerTrains an hour, even though I’m only making 5 cars an hour as reported on the efficiency panel.
Now I’m looking for it, I see some other items vanishing from stockpiles as well; fuel tanks from Chassis Assembly when it’s not on the fuel tank step. As with powertrains, I’m seeing radiators and exhausts vanishing from Fit Radiator and Fit Exhaust as well.
I’ve been finding it extremely had to make any sort of profit so far while playing, so if I’m paying for a lot of vanishing components, that might explain it!
Happy to pass on a save file if needed.
edit: with predictive stock control, I now see one powertrain consumed when a car arrives at the slot, and sometimes (~every five cars or so) another 5 powertrains then vanish when the car leave the slot.