Hi guys im about to do the oil in my F6 its done 101000km and I don't know what oil to use? ZF Lifeguard Fluid 6- S671 090 255 VS FORD WSS-M2C919-D Can this be mixed? are they the same oil? I can get ZF LG6 from the U.S for $230 6L vs $72 1L from fraud Thanks guys