In my experience with dozens of Rolex's, if it's keeping good time don't mess with it. My Sea Dweller is starting to pick up time, around 15 seconds a day, and I'm on the fence with sending it it. I've been wearing my 5513 Sub for the past few weeks, and it was last serviced by Rolex in 1998, and it's still within 5 seconds a day.
Originally Posted by Bongolia
I've not serviced my Sub since the day I bought it (2006)
Still runs bang on time. Should I get it serviced as a form of preventative maintenance?