ive been reading the different threads on oils but not finding much on my question. Whats the best oil for a 525sc? I do a fair amount of idling due to NO WAKE zones if that makes any difference

I would use 20w50 vr1 has zinc and no issues. Good stuff.

ive always used royal purple or amsoil in the past but wasnt sure how that would do in this motor

Why would the oil change based on the motor? Amsoil or Royal Purple are great. Use a good oil and you will be good to go. I would go with Amsoil with a Amsoil racing filter more sq in. of filter media.

my other boat and my vehicles are stock engines..wasnt sure if it would be any different with the supercharger since some oils say that they are better suited for supercharged or turbo motors

i would be more concerned about changing the oil in the supercharger also..

I used Kendall GT1 20w-50 in my 525's for 6 seasons. And still use it.
http://www.conocophillipslubricants....0TDS%20Web.pdf

+1

Supercharger was just gone through about 10hrs ago. How many hours should that be changed at?

For as little oil as they hold, I would change it more often, than what they recommend. These blowers have a tendency to fill the oil reservoirs with gas, when the seals start to go. Changing it frequently, assures you to catch any fuel in there before any damage to the blowers. I quart of gear lube will cover both blowers.

I used a little pump that hooks to a cordless drill. Sucks it out, and put fresh in. There is a front and rear crankcase on these blowers.

Me, I'd change it every 10-15 hours. Some may say overkill, but for under 10 bucks, and 15 minutes of time, worth it. Those little blowers work hard.