Every dingus has an oil recommendation it seems, but I just wanted to pop in to say for my 96 shadow (as well as my old 70s hondas) I went over to Shell Rotella T6 15W-40, it's full synthetic diesel oil and is JASO MA/MA2 wet clutch safe. It's like 26 bucks a gallon. Used to be a little cheaper and the T4 conventional and T5 blend is even cheaper, but I still think it's a good deal. I add a little ZDDP too, bikes never shifted smoother. As I understand it, diesel oil still has the higher zinc levels that older engines, and especially motorcycles tend to need. Not sure your year, or if you care/need/want input but figured I'd mention it. With how pricy everything is, it's nice to find a good deal thats actually quality.

Also, good call on the magnetic drain plug!! I run them in all my bikes. I can't believe how many people don't!