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First Service, Used Bike.

If you received the owner's manual, it should indicate what weight oils are required in each hole. Or get yourself a service manual for your model and year and check it for specs.

That's what I did when I did my first complete fluid change for all three holes. My '08 FLSTC requires 75W-140 for the tranny. I used Amsoil synthetic for the tranny; Mobil1 20W-50 in the engine and I did use H-D 20W-50 in the primary. If you follow and go "by the book", you cannot make a mistake IMHO.
 
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