im not asking about this for my lt1, but for any car in general. i usually run green prestone in both of my vehicles but my truck is running low so i picked up a gallon of green zerex from NAPA since i got it a little cheaper. will it be ok to top off (any vehicle) with zerex as long as its the same color (green)?

 

yes, mixing same colored coolant is fine... just dont mix green and red.

 

Yeah...dont mix dexcool (orange) with Green.

I am now running Yellow Prestone.. it can be mixed with either