I've never had a new motor - always bought tired, used motors.

When should I change the oil - around 20 hrs on it now (prob less). I was thinking I should go ahead and change it.

Now...I need a quick refresher course in basic "regular" maintenance.

1. impellar / water pump - I just changed this last month
2. TRS drives...what maintenance?
3. Transmissions...?

Obvoiusly those are the "big ones" - any other commonly neglected maintenance I need to do ASAP. I don't know when the last time ANY maintenance was done on this boat other than the motor (brand new) and the boat is 30 yrs old.

20 hours would be a good time to do it with a new motor.

Impeller at the start of every season.

I changed out the break in oil at 3 hours. next at 10 and ill prolly go 15 then 20. I think mercruiser said 26 hours between changes on like the 500hp engine. i am not sure on that. 20 sounds good

Mine first time bout 10 hrs ONLY waited that long because it was shootout weekend and I was breakin it in right!
Next time 10 now every 20 max for me.

10 Hrs on new engine. I go no more than 15 or so between changes now. Makes me feel better.

Cool - thanks guys.

I wonder what the builder told you to do??