Triumph Rocket 3 TFC 2020 Owner's Handbook Manual page 170

Specifications
Fluids and Lubricants
Bearings and Pivots
Brake Fluid
Coolant
Engine Oil
Final Drive Oil
170
Rocket 3 TFC
Grease to NLGI 2 specification
DOT 4 brake fluid
Triumph HD4X Hybrid OAT coolant (pre-
mixed)
Semi or fully synthetic 15W/50 motorcycle
engine oil which meets specification API
SH (or higher) and JASO MA, such as
Castrol Power 1 4T.
75W/90 fully synthetic hypoid oil that
meets specification API Service Level GL5,
such as Castrol SAF-XO fully synthetic
hypoid oil.