We use 40 weight in winter and 50 in the summer. The new 20/50 oil should work just fine. The choice is totally up to you.
It should specify somewhere under the hood, but it should be R134a.
According to the Owner Guide ( 5W-30 )
5w30 or 10w30
It will take 2 1/2 to 3 qt. if it is above 60 degrees most of the time in your area used straight 50 weight.
80w90
Sirius Sportster is a radio used to play Sirius satellite radio in your car, home, office, or anywhere else. It has a color, easy to navigate display and connects through the radio or speakers of other devices.
A mushroom anchor should only be used for small, light-weight boats.
The correct weight which should be 5w20 is listed in your owner's manaul.
SAE 10w30.
Factory manual recommends HD Multigrade 20W50 for Above 40 Degrees F .. I use Amsoil 20W50 on my 04 Sportster which now has 27,000 trouble free miles on it.
Look at your oil cap. The weight is on the cap.