I don't really know the differences between types of oil so I was hoping someone might shine some light for me. I have a 91 FZR 600 with 19k miles. I have had the engine apart for about a month or two to fix the transmission. I am wondering what type of oil I should run in it after I get the cases back together. I plan to register and insure it as soon as I get it running . Right now its cold usually around 20-30 degrees everyday with a few odd 50 degree days. I don't think ill need an oil change before it gets warm and around 80 everyday but maybe. What type of oil is good for cold/mild weather, and hot weather, or is it all the same? Also wondering if it makes any difference that the cases and all the internal parts have been sitting for a while open to air.