Junker, your owners manual allows 20W-50 for temps from 14F to +104F.  The 20W-50 is just fine.  That Mobil 1 V-Twin blend is excellent oil.  It's rated API SG, has ample zinc, good for wet clutch, and formulated for an air-cooled engine.  It's synthetic and can handle much higher temperatures than a straight petroleum oil.  The SG rating also gives it the API seal of approval for primary drive gears and transmissions.  What more could you ask for?  It's a perfect oil for the Savage (unless you're into cruising when the ambient temp is below 14F.  Brrrrrrrrr!).