'06 VStar 1100. I run Amsoil. I have heard conflicting reports. I am ready to park it for the winter. Should I change the oil now or wait till spring? I live in NW PA and pull it out and let it run for a half hour or so during the non-riding season about every two weeks. It is on the battery tender the rest of the time. Stored in an unheated garage. I usually change every spring, and it doesn't get more than 4K miles per year. Any suggestions?