What is the shelf life of RMI-25?

RMI-25 does not have an exact shelf life. If the bottle remains sealed, the product stays perfectly viable for over a year. Once the bottle is opened, it may slowly lose it’s effectiveness – primarily the oxygen scavenger component. It may also thicken as time progresses, though this isn’t a problem as it dilutes with the coolant or cooling system water. Using older RMI-25 will not be harmful in any way, but it just may not work as well as newer product.