Honda VTX1300C VTX 2004 Owner's Manual page 89

Engine Oil & Filter
Oil Recommendation
API
classification
viscosity
(weight)
JASO T 903
standard
80
Servicing Your Honda
SG or higher
except oils
labeled as energy
conserving on the
circular API
service label
SAE 10W-40
MA
suggested oil
Pro Honda GN4 or HP4 (without
molybdenum additives) 4-stroke
oil (USA & Canada), or Honda
4-stroke oil (Canada only), or an
equivalent motorcycle oil.
Suggested oils are equal in performance
to SJ oils that are not labeled as energy
conserving on the circular API service
label.