I have always used Castrol power 1 in my 07 WR 250 as I get it for a good price and it seems fine. I had some work done at the Yamaha dealer and they changed oil for me and used Yamalube. I was suprised to notice that it shifted much easier and was not as 'notchy'. I thought I might have imagined it but when I changed back to Castrol it was harder to shift, has anyone else used Yamalube? Thoughts on using it ?