How often do you guys change motor oil/ filter/drive oil ETC ???

I run 15-50 Mobil 1 synthetic in my engine. At 20-25hours I change the filter and top off. Then at about 35hours I change the oil and filter...
As for the drive, I run the Merc HP synthetic and change it at about 50hours...
Gary, if I had your engine and drive package, I'd run synthetic and change everything, every 25hours...

I Use Penzoil Racing 25-50 And Would Love To Change Every 50 Hours. But I Only Average 10 Hrs A Year So 10 Hours It Is. For The Drive I Use Amsoil. Dont Know If I Would Use It In A Bravo.

I used the same oil and filter as Pat.
I changed the oil and filter at 20hrs.
Changed the drive oil at 35hrs. I would have done that earlier if I had the boat on the trailer more often.
I agree with pat, w/ your HP package its good preventative maintenance.

BTW, don't forget to check on the hydraulic steering fluid too.

I change every 20-25 hours which usually means 3x a season. Oil is synthetic but I forget which one (its at the shop)... current boat is a V-drive so no outdrive but the tranny for the V gets changes the same as the engine.

I have been changing oil & filter every 15-20 hrs ( merc racing choice Kendall GT 1 20-50 ) Drive every 25 hrs and Supercharger every 25 hrs !!!