i have never heard of 0w30 oil i have heard of just 30 weight oil and 5w30
googled it for you
https://answers.yahoo.com/question/i...3074530AACL2ID
google is educated? guess 0w30 is synthetic so that makes it different than just plain 30 weight oil
http://www.mobiloil.com/USA-English/...l_1_0W-30.aspx