Husqvarna PT-26D Operator's Manual page 123

3. Wipe new, clean engine oil onto the seal for the
new filter.
4. Fit the filter by hand until it mates + 3/4 turns.
5. Run the engine warm, then check that there are no
leaks around the oil filter seal.
6. Check the oil level in the engine, top up if
necessary. The oil filter holds 0.2 litres of oil.
9. Hydraulic oil
Viscosity and quality
Hydraulic oil Statoil HydraWay HVXA 46.
Viscosity 46 cSt.
Local regulations may affect the choice of hydraulic oil
due to environmental reasons, consult your
Husqvarna workshop at the relevant location.
Lubrication
121