A monkey with a vis chart could easily eliminate many Mobil 1 products. Lets see 0-40 alone would get rid of 0w20,0w30,5w30,10w30,5w40. Keep the 15w50 for heavy use and keep the racing 0weight and call it a day. I live in Ohio and have bad winters and hot summers. I use 0w40 in my race bike and...