The ornamental design for an automobilebreathercap, as shown and described.
FIG. 1 is a front perspective view of an automobile breather cap according to my design;
FIG. 2 is a front elevation view thereof, the rear elevation view being identical thereto;
FIG. 3 is a right side elevation view thereof, the left side elevation view being identical thereto;
FIG. 4 is a top plan view thereof; and,
FIG. 5 is a bottom plan view thereof.
The broken lines shown in the drawings are for the purpose of illustrating environmental structure and form no part of the claimed design. The dot-dash lines are boundary lines and form no part of the claimed design.