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I emptied the sump when I switched to synthetic and it was some of the nastiest s**t i've ever seen..didnt really have to do it, but was doing a complete oil scavenging.
In my 2006 Heritage Classic, there are actually three plugs. One is the oil plug, as identified in the owner's manual. The other two are within two inches from each other. one higher than the other. If one is for the sump, what is the third for?