The oil soaking is your likely culprit. In order to generate the EMF to drive the starter winding, the power to overcome the resistance caused by the oil is great. Electrical parts like starters, generators and alternators like to be dry. Keep a fire extinguisher handy until you change the starter AND fix the oil leak. <img src="/forums/images/graemlins/kewl.gif" alt="" />

1987 Raider - Roxy
1988 Mighty Max 2.6L Turbo - Pearl
1997 Mountaineer V8 - Freddy
2000 Excursion V10 - Freya