Amsoil 0W-40 vs Yamalube 0W-30 Year Round

[purl]

I have an 05 350 Bruin 4x4 (wet clutch). I use it year round here in Eastern Ontario. I'm looking for a year round oil to use instead of changing spring and fall. I usually only put less than 500km on per year. Temperatures range from -20c to 30c (0F to 85F) These would be extremes I would use the bike. I'm thinking of trying Amsoil 0W-40 or Yamalube 0W-30. I find such conflicting posts on many ATV forums regarding this. Just looking for any input here.
Thanks.

 

[low slung]

Go with the yamalube cold weather stuff.That way you will never be in doubt .

 

[maim]

use the yamalube. i had an issue with clutch slippage on my bigbear with amsoil with oversized rubber.

 

[devinzz1]

0W-30 in 30C temps? I would go up to yamalube 10w40 which is what I use (in the yamaha owners manual its got the widest temperature range.) But really the 350 is so reliable it could probably run on bacon grease...