Pulled the starter for kicks trying to track down a starting problem. It looks like whomever changed oil prior to my recent ownership had always let the remaining oil drain from the filter over the starter. I removed the two long bolts from the starter. They were covered in oil sludge. I lifted the backing plate off about a 1/4 inch. It was all sludge. I've rebuilt starters before, but haven't seen this before. I tried to test the starter with jumper cables to see if the starter functioned. The solenoid worked grudgingly; the starter motor barely turned. Problem detected. At least the starter was well lubricated.