I was actually disappointed when I took my T-Bird in for the 500 mile service and found out that they are using Castrol. I've always used Mobil 1 in my cars and bikes. I will be changing my own oil from here on out and I wouldn't use anything other than Mobil 1.
As far as Mobil 1 "smoothing out" your bike, I am not surprised. I noticed it when I first put Mobil 1 in my 2000 Super Glide and 2007 Road Star. Yes, oil can do that !!
2010 Thunderbird SE