I am looking to buy a oil extractor to start changing the fluids in our 2013 Moomba LSV. All I can find are ones that extract the oil from the dip stick - Are their any that you can hook to the hose that comes from the engine?? How many of you change your own oil? do any take to the dealer to change?? I did take our boat to the dealer for the first service but I can buy all kinda new tools / gadgets if I do this myself - Lots of savings!! Thanks for the help and advise!