I recently bought a 2006 freightliner sprinter, on my first major highway drive the high oil light started flashing after about 10 minutes on the highway. I pulled off and it turned off within a few minutes and stayed off while I drive home on surface streets. I tried getting on the highway again with the same results. Has anyone had this problem? Should I be concerned about an oil pump failure or some other major issue or could there just be slightly to much oil?