Triumph Trident Owner's Handbook Manual page 142

Specifications
Fluids and Lubricants
Bearings and Pivots
Brake Fluid
Coolant
Drive Chain
Engine Oil
142
Trident
Grease to NLGI 2 specification
DOT 4 brake fluid
Triumph D2053 OAT coolant (premixed)
Chain spray suitable for XW-ring chains
Semi or fully synthetic 10W/40 or 10W/50
motorcycle engine oil which meets specification
API SH (or higher) and JASO MA, such as Castrol
Power 1 Racing 4T 10W-40 (fully synthetic) engine
oil, sold as Castrol Power RS Racing 4T 10W-40
(fully synthetic) in some countries.