Angle drive has been holding up fine today. I suspect the problem is just a design defect with those plastic dust caps. I you ask me, the part where the angle drive shaft connects should be metal. Plastic becomes soft when exposed to heat/friction for extended amounts of time.

My current mileage is 55,505 and my oil still looks good. I haven't added one drop of oil to my engine since my last oil change. I was thinking of doing an oil change in route but it looks so good right now that I'm not going to worry about it.