So, I am going through a divorce after 20 years of marriage. I have never changed my own oil, but it's time I learn. I have a 1999 Wrangler Sahara, and I know it's about time to change the oil. I have the oil weight and capacity, but I don't know much else. I know there are books at the store to tell you what filter size, but someone was telling me that I would need to change the crush washer/drain plug washer. I researched a bit, but I can't seem to find anything about that, such as size. Can someone help me with that information?