I'm at work----my brain is screeming non job related XRL questions and I do not have a manuel with me.In cold weather(below 20 deg.F)is 5W-30 oil to light---not recommened for the XRL.Why would I be operating a 650L in that cold of temps---I don't know!,my brain is asking silly questions????.Start-up viscosity is the main issue,right?. TIA Frog13:thumbsup:

I think 5W-30 would be fine. I run 10w-30 in the summertime in my XL with no problems.

frog13 said:

I live in a climate where it snows in winter, and gets over 100 in summer. For me its 5w-30 in winter, and 15w-40 in summer. Used to run 20w-50 in summer, but diesel oils seem to have a better additive package.

i think alot depends on temps during the day when your riding too, if it only gets 40/50 then you can go lower weight oil, i personally wouldnt go below 10/40 myself in winter, and i live where its below freezing at night and winter it may only be 50s during day, but im using 20/50 all year as i dont ride alot when its really cold, its a short brief ride when its in the 30s till it warms up some. i cant see why 10/40 would be too bad for startup when its really cold as it doesnt take but a few mins to get the oil warmed up some.

For the best of both worlds try the 5w-40 Synthetic Rotella T. Nice and 5W thin when cold and still a 40 weight oil for when the engine warms up.

Be careful, that 5w-40 Synthetic Rotella T isn't a synthetic oil at all and, like all dino oils, gets very thick in colder temperatures. A true full synthetic oil is much better at offering proper cold-weather lubrication.

I am NOT knocking the Rotella, just presenting the facts... I use Rotella once in a while, just not when it's cold!