The ornamental design for the slide track oval running board, as shown.
FIG. 1 is a perspective view of a slide track oval running board showing my new design, in use;
FIG. 2 is a front view thereof;
FIG. 3 is a back view thereof;
FIG. 4 is a left side view thereof;
FIG. 5 is a right side view thereof;
FIG. 6 is a top view thereof; and,
FIG. 7 is a bottom view thereof.
The broken lines shown in the drawings are for the purpose of illustrating portions of the slide track oval running board that form no part of the claimed design.