Dario
Ok so the current way is we buy and repair engines right? That's normal.
But with the update I have my own engine which I use to race with. Why do I have to keep buying engines from the old system ? I don't need the old engines but the game stil makes me buy them.
From what I've gathered, you are wondering why you still need to repair engines after each race since you are now a manufacturer.
The engines you replace is a standard part of your car. Take that first point as a constant. You will always need to repair that. Let's call it Engine 1.
The engines you manufacture simply replaced the old engines in your suppliers section, not the one above. Let's call this Engine 2.
So whether you are a manufacturer or not, you'll need to buy engine parts for Engine 1.
For Engine 2, it's customizable by track hence the need to buy parts for each track. 1 engine doesn't apply to all the track.
Hope that answers you.