More often if you have been driving on especially dusty roads. An oil change is very cheap insurance against engine wear.
=========================================================== Daniel Levitin, Ph.D., M.S. Ph: (541) 346-1990 Deptartment of Psychology 1227 FAX:(541) 346-4911 University of Oregon Eugene, OR 97403-1227
My other NeXT machine has a broken floptical. ===========================================================