I know I need to check/add some coolant additive. I replaced the original coolant with prestone heady duty (purple stuff) awhile ago.

Is ford the only place to get test strips? Napa?
Can I use any brand of additive with this coolant. Is the ford FW16 the best choice?

Thanks
Justin

 

Was it this stuff?

Prestone Heavy Duty Antifreeze

Or this stuff?

Prestone Heavy Duty Antifreeze/Coolant Specifications

If the former then Napa has test strips.

NAPA AUTO PARTS

and SCA's

NAPA AUTO PARTS

If you have a Cummins shop around they have the strips and SCA's too.