How often should you have to add oil to a Harley Sportster 1200?

What is the displacement of the engine?

What is the bore and stroke?

What angles are the cams at?

Is the engine new or rebuilt?

How old is the bike?

How many miles?

What type of riding do you do?

Is it cold or hot out?

OR................

Check the dipstick or oil window and add as needed.