Fear not Im not going to ask whats the best oil!!! But I am going to ask in an RFS engine the recomended oil is 10/50 full synth .. right. Now I know KTM uses this Motorex stuff so I guess its good stuff, but at my local dealers they are only selling 10/60. I asked Ams dealer about oil and they said the 10/60 is only for the new breed of 450s is it XC engines?? And ok to go in the RFS but should use the 10/50. On enquiring again at my local dealer, he said Bo**ocks the new oil is fine for my KTM... its the 10w number thats important dont worry about it. Not normally an oil worryier but do want to bung the right stuff in