Fox suspension oil for servicing Fox forks and rear shocks. For use when servicing FOX DHX2 (2021 model) and Float X2 (2021+) rear shocks. For use in all MY2025 and newer Fox and Marzocchi forks with GRIP, GRIP X, GRIP X2, GRIP SL or Rail damper. Replaces Fox 5wt PTFE Infused Oil - If switching from 5wt PTFE Oil to 4wt, there is no need to fully empty the 5wt PTFE oil from the damper as the Fox 4wt and 5wt PTFE oils can be mixed. You can find oil volumes here - MTB Suspension Fork Oil Volume Charts