Turn the first valve cap counterclockwise to loosen the trombone valve cap and release it from the valve casing. Do not pull the valve out of the valve casing at this point.
Pull the valve out of the casing so that 2 inches of the trombone valve shows above the top of the valve casing.
Squeeze the plastic valve oil container along the top of the silver plated valve. Coat the entire exposed portion of the trombone valve with oil.
Drop the trombone valve back into the casing and pull up and down while holding the valve stem to disburse the oil evenly.
Follow the same procedure for the remaining two valves on the trombone.