Triumph Bonneville Bobber Owner's Handbook Manual page 134

Specifications - Bonneville Speedmaster
Fluids and Lubricants
Bearings and Pivots
Brake Fluid
Coolant
Drive Chain
Engine Oil
134
Bonneville Speedmaster
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.