Honda CRF1100A 2021 Owner's Manual page 273

Oil code
Oil classification
The SAE standard grades oils by their viscosity.
*2.
The API classification specifies the quality and
*3.
performance rating of engine oils. Use SJ or higher
oils, excluding oils marked as "Energy Conserving" or
"Resource Conserving" on the circular API service
symbol.
Not recommended Recommended
Maintenance Fundamentals
Brake Fluid
Do not add or replace brake fluid, except in an
emergency. Use only fresh brake fluid from a
sealed container. If you do add fluid, have the
brake system serviced by your dealer as soon as
possible.
NOTICE
Brake fluid can damage plastic and painted surfaces.
Wipe up spills immediately and wash thoroughly.
Recommended brake fluid:
Honda DOT 4 Brake Fluid or equivalent
267