I just took possession of a new Forester this week, so I also got a 3-day subscription to Subaru's Technical Information System so that I could learn more technical stuff about the car than what is included in the owners manual. Any-who when I read thru the oil change procedure I was surprised to see that Subaru includes a step calling for the replacement of the "oil pump union" when changing the oil filter. I've never heard of that term before, but finally learned that it is the threaded bolt that the oil filter screws on & off of. See pic below. Anyway, for you experienced DIY oil changers out there, is this something you really do need to replace when putting on a new oil filter?