What is the recommended procedure for top-off service with nitrogen-filled tires?
RTI recommends users always check both nitrogen purity and pressure in each individual tire (including the spare) before any service. Testing nitrogen purity is as important as pressure because many consumers don’t always remember the service history of their tires or don’t realize the dilution impact of ambient air if one or more tires were unwittingly topped off by a non-nitrogen pressure source. To avoid any issues, it is always better to be fully aware of the fill condition of all tires before you start a service.
