I picked up a used 2008 Wrangler about a month ago, very clean, however, it does have high mileage, 136,600. The only thing I can find is a very small leak around the oil pan drain plug. I ordered a new one so when I change my oil I can also change the drain plug. One other oddity is the letters / writing on the bottom of the oil pan, it looks like a capital F A. Any ideas as to what it could reference?