I need to change the oil in my '09 Bonneville. My friend who recently sold his metric V-twin gave me half a case of 20W-50 Castrol 4T conventional oil. This OCI will probably be for 1500 miles tops. Due to limited riding time this will carry me in to late October or so when I will change back to Mobil 1 4T 10w-40 for the winter. I have seen some negative comments about The Castrol dino on this forum but have not been able to search out any VOAs or UOAs that show it is tremendously inferior oil. I have enough Mobil 1 stashed for one change and prefer to save it for the fall change as I actually ride more in the fall and winter than the summer. Can anyone steer me to info that gives any factual info about Castrol 4T dino that says it is inferior oil? I am retired and on limited income so free oil sounds pretty good if it is not going to cause harm. If it is bad oil I can get Delvac for a very reasonable price.