I know that it has been fine to use Mobil 1 15-50 in the hydro's, but is there anything wrong with using the new Mobil 1 Extended performance 15-50. I can't find the old stuff. I read somewhere on another forum that the Extended performance oils should not be used in autos under warranty, but I think that is for extended drain recommendations. I am approaching the 50 hour mark (probably tomorrow) and need to know if the oil I have is fine? It says it meets API service SL/CF.