Why not to use "big rig coolant"? Because then you will not return to purchase from dealership. The other coolant is made to a higher content of nitrate that is required for sleeved engines to extend cycle life. It also has (cant remember name) same substance as water wetter and water based cutting fluid that increases surface tension for better cooling.
I have run it in different vehical s with good results, but I don't have easy access to it now so I don't bother to drive 35 miles out of my way to buy it. It is more expensive but the longer life makes it ok.
If you are trying to figure out how to improve what you are running start by using the test strips to see what is going on. Also if you ever take off a part like thermostat housing and it has pitting the electrolysis is causing it and running a ground wire to that part will help the part stay good longer and that will keep the metal from contaminating the coolant and give it longer life (I know one more ground wire to worry about).
The other reason for pitting is the micro air pockets and instant boiling at that tiny location the water wetter is fighting first once you know it is grounded and you still notice more pitting increase quantity of water wetter.
