Grear lub question for TRS- yes beating a dead horse again
 

I change the drive fluid in all my boat every year. TRS/ 600 hp twin turbo Scarab and a Alpha/ 300 hp sbc Formula 242 ls. The Formula has a drive shower on it now. I have always used Mercury high performance in everything, but wonder if there is something better. I have seen a lot of people using Amsoil, Delvac. Please tell me about the fluid your using, how long and the cost your getting it for.

I use Bravo Shop in mine the last 4-5 years. Probably overkill for my setup but wanted to support the local lake business. I can't remember what I paid but was about the same or slightly more than amsoil which I switched from.