Cups and 172s (Maybe V6s) are 12000 miles for a service and i was told by my local dealer they dont use elf oil even though its advertised on the back of my car...bizarre?!
According to Waters of Letchworth, Castrol GTX 10 w 40 is the oil.
Who knows with car dealers though, my cup just came back from a suspect rear brake disc and it took them from 8:30 am to 4:30 pm to tell me a stone had gone through my brake pad, they didnt even check the rust on the disc, which is the reason i put it in!!