Currently my 2012 CK27hst has 1220 hours on it and it has whined since day one. I asked the dealer about it and he said that some do and some don't. Don't sweat it, just turn the stereo up louder. So after the warranty was up I put a straight pipe on it. Now I got something to listen to...
The oil for whatever needs oil is SHELL Rotella for the engine, SHELL S3 grease, CASTROL 90 weight gear oil, I am not sure off the top of my head what hydraulic oil I am using but I think it is PETROCAN 90 weight. They own SUNOCO up here.