Greysnake wrote:
I've been running amsoil 10w40 in mine all year and it made the trip from Ky. to Oregan and back in all temps and altitude's.it did just fine.
But it's your choice what to use.JMHO.

It's been quite cool here in Alberta this year, most morningsa are still freezing temps in late May.
I've been using Mobil 1 V-Twin 20w50 synthetic oil in my Roadie for a few years now. I have noticed a buzzing sound from the cam side of the engine after starting at cooler temps... This osund is never there on hot-day starts if the bike has been running recently. It lasts longer after startup the colder the temps.
Well anyways I got to thinking that it sounds like the steering pump on my work truck when it's really cold outside after a cold start. The steering pump is "cavitating," in other words, it's short on oil, as the oil is too thick to suck into the pump. This creates air bubbles to form in the thick oil that is under a "suction vacuum" this makes the steering pump buzz. Sounds like "eeeeeeeeeeeeeeeeeeeeeeeeeerrrrrrrrrrrrrrrrrrrrrrrzzzzzzzzzzzzzrrrrrrrrrrrrzzzzzzzzzzzzzzzz"
and quite loud and annoying too.
Well anyways. the Roadie sounds like this too, only much quieter, but similar.
I am positive it is the oil pump "cavitating" as it ries to suck up the thick 20w50 oil and push it through the oil filter. Dry-Sump system like the Roadie has would make this problem even worse.
So I have decided to dump the 20w50 V-Twin oil this oil change, and try some "Amsoil 10w40 MCF." It is supposed to be able to handle the high heat on the hotter days, and still be able to get sucked up by the oil pump and through filter to the engine parts on cold mornings.
I haven't tried a cold start to see if the noise is gone, but I'm willing to bet it is gone next time I start it cold. ???????
I'll be sure to let ya all know the outcome..... -SM