I just got my 115 module updated and they gave me the printout. I have 134 hours on it. The motor was purchased in May '06. The update made it idle smoother. I run in the flats and water is very salty. I know that BRP says 3 years no service, etc. My question is, should I have the lower unit oil changed and/or anything else done to this motor because of the # of hours and the salty water?