Triumph Thruxton TFC 2019 Owner's Handbook Manual page 126

Specifications
Fluids and Lubricants
Bearings and Pivots
Brake Fluid
Coolant
Drive Chain
Engine Oil
126
Grease to NLGI 2 specification
DOT 4 brake fluid
Triumph HD4X Hybrid OAT coolant
(pre-mixed)
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.