I have a 2015 SeaDoo GTI 130 with 18 hours on it, the owners manual states that the first service is at 50 hours then every 100 hours after that but when I picked it up from the dealer he told me to bring it in for its first service after 25 hours then every 50 after that. Is he correct or is he just trying to get more money out of me? I know it's expensive to get these machines serviced so I'm not too keen on getting it done more often than needed.