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Not sure what the PO had in the bike when I bought it but it had been sitting for a bit, so first thing was an oil change. I did it with Kawasaki oil regular stuff, and ran it with that over the winter I was seduced by the Amsoil info. So switched over to that and man was the engine loud the shifting loud and rough, so after only 3 months (nearly the whole summer here) I switched over to Kaw synthetic oil, and have been using it ever since.
I switched from dino to synth, when I first got my bike. The engine instantly ran much quieter.
I switched to synthetic decades ago. All my vehicles use synthetic from the first oil change (nowadays many come with synthetic). I have never had an oil related failure. Synthetic handles moisture (and weather) and heat better, so it is great for bikes. I think the bike runs and shifts better with synthetic, but have no proof of that. AND, it lasts longer. I honestly have found no reason not to use synthetic. It is more expensive but not by enough for me to notice or give up the benefit.
Do a search here for "oil" and you will come up with a lot of info.I think it's a matter of taste really. I run synthetic, because I like the longer life of it and I think it keeps the engine a bit quieter. I know lots here who swear by dino oil. To each his or her own.
Another new guy question. So while I'm waiting for my baffles to come – bike's too loud to even run it the way it is – I might as well do all the regular maintenance on it. I ordered a filter and I went ahead and bought the same oil that I run in my Valkyrie – full synthetic four stroke motor oil, which is OK for a wet clutch (has no friction modifiers, moly or anything). And then I got to thinking, maybe I should ask the guys on the forum what they're running for oil. So I'm all ears, well cyber ears 
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