I just bought a 1998 xr650L and was told it needed an oil change. I bought the filter, but am not sure what the criteria is for what oil to use. Can I use certain "motor" oil, such as what I use in my truck? I have a barrel of mobil 1 delvac 5w-40 synthetic, and would love to be able to use this instead of buying something else, but I want to make sure I do everything correctly. Thank you for your help and suggestions. Take care.