Aldo
Before the update a level 30 engine could change the weakness indipendently of the strength. Is it still possible to do on level 30 engine or was this feature moved to level 40 engine?
This is still possible, I’ve a level 37 engine (feel free to apply to it).
That beeing said, the chosen weakness only works for the manufacturer account, clients always get the paired weakness. For instance:
Manufacturer:
+37 braking and -19 fuel economy
Client on this engine
+37 braking and -19 on paired attribute, this is acceleration in this example