We recommend size UL/1000/10 for light fishing, for example rainbow trout, trout, grayling, perch etc.
Size 2500/25/30 for jig fishing for perch, lighter pike fishing, sea trout etc. Size 4000/40/30 are recommended for the slightly heavier fishing for example pike and sea trout. Size 5000 and upwards fits well for sea fishing for cod, saithe etc.
Reviewing your reel at regular intervals is a good idea
It lasts longer, the drag will be steady and smooth while the feeling remains the same. Shimano has exploded views of their reels at www.shimano.se.
Shimano's Swedish reel doctor Jan Eriksson says this about reel service when doing it at home:
• Wipe the reel with a cloth after fishing and store it dry and warm.
• Release the drag between fishing trips.
• Service the reel with oil at regular intervals, there is multiple tutorials on the web.