I am looking for recommendations for a mechanic that can perform oil/transmission fluid change on my 370hp diesel engines. I am new to boating as of this Summer. When I called the marina to schedule an oil change, they said they were too busy (I've since gotten that same response from several other marinas). My boat is currently at Emerald City Harbor and I will be moving it to Tashmoo on Harsens Island for starage in the next week or so. Any advice would be greatly appreciated.