I have a 2009 KLX250SF and I'm about to handle the first oil change. Flipping though the manual it states the oil is 10W-40. However, it also states to you "may need to change" to a different viscosity due to "atomspheric conditions." I live in Central Florida so it rarely gets below freezing. Possibly for a couple of days (spread out) through winter. And I wouldn't be riding anyway when it's that cold. ;-) My riding temps are between 50 to 90 or more. And there's the humidity here. The manual says the 10W-40 is for temps up to 104. It doesn't get that hot but it may be above that with the "real feel" temp when you include the humidity on some days (temp is 95 but real feel is 105). Anyone have thoughts on changing my oil viscosity due to my climate? Maybe changing to 20W-50? Thanks.