Hi all, I have a 2001 AC quad 400 4x4. I live where it gets very cold in the winter (-30 cel.) I know that 0W-40 synthetic is recommended for these kinds of temperatures for my quad. The local parts store talked me into buying 5W-30 synthetic, as they did not have the 0W-40 that I wanted. I don't fully understand oil ratings and was wondering if this oil will give me the cold starting benefit that I am looking for. In addition is it safe for AC engines?