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Message: <blockquote data-quote="funfer_fahrer" data-source="post: 407113" data-attributes="member: 2733">Some people suggest you sevice every 5 years. A watch seller in Germany told me that you don't need to service your watch unless it starts giving problems like getting slower and slower. This is because the oil used today is synthetic type compared to the oil they use 20 years ago. Somehow rather watch manufacturer still insists you to send the watch for servicing every 5 years. The watch seller himself has been wearing his mechanical watch (a Fortis) for 16 years without any kind of servicing. If you ask me personally, it is suffice to just change the rubber seal every 3 years. <img src="http://www.bmwclubmalaysia.com/forums/cb/buttons/report.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" /> I suggest you change the battery for your tag every two years, maximum 3 years. This is because even a healthy battery also can leak without any signs or symptoms</blockquote>