Everyone is welcome to and has an opinion about oils. One man's experience. Do all of my routine servicing myself (oil changes, adjustments, etc.) 1999 Dyna, 85,000 miles (not a misprint). Engine never down, has original cam bearings that were reported to go out really early on, uses NO oil between 5,000 mile changes (lots of opinions on change frequency). Started using Mobile One V-twin synthetic shortly after buying the bike new. Harley had not introduced their Syn 3. Switched to Syn 3 after Harley introduced it. Never a problem with the bike, still ride it when the RG is down for maintenance, repairs, etc. Want to put 100,000 miles on engine before rebuild it just to see its condition.
Have used Syn 3 in 2011 RG since new. Bike would go 2,500 miles then belch or swallow (don't know which) about 1/2 to 3/4 quarts of oil out. It was odd, no oil used before 2,500 miles but could count on it at 2,500. After topping off would use no oil till next change at 5,000 miles. I know that will start a lot of discussion about frequency. One man's opinion.
But at 25,000 miles things changed. No oil used until hit 30,000 miles, Nada. Routine change at 30,000, no oil used. Took 25,000 miles for break-in? More discussion expected - should have used fossil oil until first change, etc. May have made a difference, but I am pleased with what I have done and engines performance.