Okay - so at the risk of starting a thread that goes out of control;
My bike is going in for 6000 mile service - I asked what type of oil they are using. Answer: "Castrol 20-50." My owners manual does not recommend that weight. All recommended weights are lighter although my understanding from flipping through the threads on this site are that all modern boxers up to 2009 or so seem to use the 20-50. I'm no engine guru - but aren't there consequences to using a heavier oil than recommended? Like not getting enough flow though the bearings etc.? I'm not TOO worried about it since I'm in Las Vegas and its 90 degrees at 6AM... but still.
Anyone point me to a tech article or the correct thread addressing this if its an old topic?