How much time does it take you or your mechanic to do: 1. Oil Change 2. Impeller Change on your diesel boat...Bonus points if you have a 3116 and 400da! I understand that it's might be longer for the stbd motor as it's on the far side . Without detailing everything, I just received an invoice from a company that did the work 6 months ago. I honestly thought that they were embarrassed to charge me because of some of the mistakes they made that day. But then this weekend I got the invoice. I'm trying to get an idea time.