Triumph Bonneville Handbook page 112

Specifications
Lubrication
Lubrication System . . . . . . . . . . . . . . . . .
Engine Oil Capacity Guidelines
(dry fill). . . . . . . . . . . . . . . . . . . . . . . . . . .
(oil and filter changes). . . . . . . . . . . . . . .
(oil change only) . . . . . . . . . . . . . . . . . . .
Note: Always refer to sight glass marking for correct level.
112
Thruxton Scrambler
Wet-sump Wet-sump
4.5 litres 4.5 litres
3.8 litres 3.8 litres
3.3 litres 3.3 litres