I use Mobil 1 4t, Castrol 4t, Valvolene 4t or what ever 4t synthetic oil I can find on sale. I service alot of motorcycles. 4t is for motorcycle wet clutch and if the synthetic doesn't have that 4t designation, it will either start slipping immediately or after some use. I found this out back in the early 90's when I did a Mobil 1 oil change on my 87 CBR 600 Hurricane. It ran like gangbusters, but the clutch would slip like crazy. Back then they didn't have the 4t synthetic.
I made a mistake once, but I was wrong?