The HD oil was made by Sun Oil for a long time, but now is made by Citgo.How can we find out who makes the MOCO 360 oil? Does your friend know?
The story about HD and Mobil is true, the Mobil1 20W50 is the oil that was specifically developed for HD.
You might want to be careful with the automotive Mobil1 in the bike. I have talked to a fellow that worked on the motorcycle oil project. He rides a Harley. He used the 15W50 as opposed to the more expensive 20W50. Recently Mobil changed the formulation of the car oil, and he said he switched to the motorcycle oil as a precaution as at this time he is not sure that the new formulation Mobil1 car oil is adequate.
Redline actually has tho 20W50 oils, the racing 20W50 which is not recommended for street use, and the regular 20W50 which actually is much more adequate for extended drain intervals if that is what you are looking for.
In my opininon you use any of these oils for extra protection, not to extend drain intervals.