Originally Posted by
jim
Not with HD's they went with the 20W-50[multi-vis] for year round temp changes. The manual suggest straight weights for hard running,consistent higher temp areas. You have a 20-Winter weight viscosity that will handle the colder temps, UNLESS you live where the norm is 40* or less for prolonged periods of time. CO rarely maintains a below freezing, consistent temp. In the am or late evenings, sure. For the average rider, not an issue. Besides he's running synthetic, not a problem.
Now those Lead Wing riders, i think they use a 10W[ROFL3] after Nov1 , they run in everything except ice packed roads, when possible. Seen herds of them coming out of a 20* fog packed highway matching paint jobs, helmets, jackets, even their walkers strapped down. Like it was a day on the beach.