Plugs have been in there four years. I'm giving it to our daughter as we are getting a new Forester and have been trying to make it "new". I'm somewhat concerned about a plug(s) possibly being seized at this point. I've been changing plugs for 40 years by the way. Also, yesterday I changed the auto trans fluid and filter. I measured six quarts drained. Although it still smelled fine, it was about the brownest fluid I've ever encountered. Has your ATF-HP had this appearance? Thank You?