Been reading up tonight on them.. Currently have green in mine, no idea when it was changed last as I got the truck last summer.. The coolant is working great and nice and green.. should I replace since I dont know the history or just check the SCA's and top off as needed? I dont have a coolant filter yet, but am planning on getting one sometime.

Thanks

 

Buy some test strips and start there. Then add or flush as recommended by the strips.

 

Thanks! Will go hunting for some tomorrow.