Just check the rating for the oil specified by the manufacturer, some other company out there will make an oil that meets or exceeds it for a lot less money than your dealer is selling. I am a DIYer for just about everything.
Funny, almost every motorcycle uses the engine oil in the tranny, there are very few bikes that have seperate oil/tranny cases. That is why you shouldn't use car oil in them.
My local Ford dealer sends me "coupons" for $19 oil and filter changes with semi-syn oil. So, the wifes Fusion goes there for the last few times.
1997 MasterCraft 205
2008 Moomba Outback
1999 MasterCraft Sportstar OB
1992 MasterCraft 205
1999 Malibu Response LX
1987 Marlin Magnum Skier