nitrates

It leaves a protective film on the liner for the tiny air bubbles to pop on without attacking the liner surface.

 

It prevents the antifreeze from corroding liners, etc.

 

How long have you been running without it?

 

You need to google cavitation on liners and see what you find. It is real, it will cost you if you don't handle it properly.

 

When the diesel fuel combusts, it creates a small sonic boom that can cause the anti-freeze to leave the liner creating a small vacuum spot. This spot overheats quickly and will eventually develop a hole in the liner.

SCA additives prevent this and are stored in the coolant filter where they release slowly in the antifreeze.

 

Helps slow the effects of cavitation on the liners. At each service you should be checking the SCA levels in your coolant to maintain the proper level of SCA's in your coolant.

 

A lot of assumptions here. First the op saying he doesn't run nitrates. I have no idea how to respond to that. It depends on what type of coolant. Green coolant comes precharged usually. With the coolant filter you're just topping it off. Red coolant needs a blank. Yellow coolant doesn't have any nitrates at all.

 

Stop using 50/50 anti-freeze as it's just a ripoff. Most of the gallons containers near me are only $1 cheaper then the 100%.