Engine Oil Recommendation - Husqvarna W 40P Operator's Manual

MAINTENANCE
ENGINE OIL RECOMMENDATION
Oil is a major factor affecting performance and service life. Use 4­stroke
automotive detergent oil.
120°F
40°C
AMBIENT TEMPERATUTE
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.
30