Just got my first xs400 from north dakota and im in texas. The original owner said something about changing the oil to a thicker one because of climate/atmospher change. I'm brand new to mechanics/motorcycles (never even changed oil for a car), but want to start learning now. What kind of oil would you guys recommend and how much does the xs400 take? And any other relevant advice would be greatly appreciated. Trying to learn as much as possible. Thanks