Last year, I bought an SX230 from the original owner, always and only serviced by the local dealer. Before buying the boat, I had them check compression. The numbers varied well outside the service manual spec (180 220 220 230
; 200 180 220 225), but they said that was fine... I thought, oook, they're the experts. I asked them to give me engine hours (~260 per engine is what they told me). The bill for this inspection was around $350, if I remember correctly.
When I bought the boat (again, only serviced by them), I found that the oil was past the full mark, completely cold, on both engines (!!!). The hours, once I got the YDS kit, were actually ~340 (WTF?!), and that the compression (once I used this throttle body cleaning procedure:
), was nearly perfect, per the service manual.
So, in short, if a dealer can't change the oil correctly, check engine hours, or thinks wildly varying compression numbers are ok, they're not getting a nickel from me. I dreeead taking my new boat there for warranty work...