Engine Oil Recommendations - Honda WH15XT Manuel De L'utilisateur

SERVICING YOUR PUMP

ENGINE OIL RECOMMENDATIONS

Oil is a major factor affecting performance and service life. Use 
4-stroke automotive detergent oil.
Use 4-stroke motor oil that meets or exceeds the requirements for API
service category SE or later (or equivalent). Always check the API
service label on the oil container to be sure it includes the letters SE or
later (or equivalent).
SAE 10W-30 is recommended for general use. Other viscosities shown
in the chart may be used when the average temperature in your area is
within the recommended range.
AMBIENT TEMPERATURE
36