Husqvarna PT-26D Operator's Manual page 119

Checking the oil level
Check the oil level in the engine when the machine is standing
horizontally with the engine switched off.
Remove the dipstick and wipe it clean. Then insert the
dipstick again.
Take the dipstick out again and read the oil level.
The oil level should be between the markings on the
dipstick. If the level is approaching the "ADD" mark,
lower notch, top up the oil to the "FULL" mark, upper
notch on the dipstick.
The engine dipstick
Dipstick marking
Lubrication
8009-793
8009-794
117