4 Core PC, but only 2 Cores Used

I have a Lenovo Z70-80 with an Intel i5 processor, a quadcore, and a NVIDIA Geforce graphics card, yet whenever I use BeamNG.drive, it only uses 2 cores. Does anyone know how to make it use all 4 cores?

 

Laptop I-core processors only have 2 cores, but they have hyperthreading. The I3, I5, and I7 are all dual core + HT, the only difference being the amount of cache (I think, don't quote me on this).

 

Try adding vehicles. Each vehicle is on its own core

 

The laptop i5 is only a dual core.

 

http://store.steampowered.com/app/384300/CPUCores__Maximize_Your_FPS/ try this but its $15 so...

 

beamng does not need to use all for cores i think so thats why

 

Dual+HT displays in task manager as 4 cores usable by beamng though so is fairly irrelevant here. Also incorrect. There are many models which are quad core+HT, i7-7700HQ for example.