Hello, hoping someone can confirm the correct fuel/oil ratio. I found the info on http://www.acresinternet.com. It calls for a 40:1 ratio on my Pro Mac 700 & Pro Mac 610. The other night, I watched a Video on Youtube on a McCulloch 610. In comment section, it talks about a 40:1 ratio if your using " McCulloch oil ". If any other SAE 2 cycle oil then the ratio should be 20:1. Aren't the oils all the same? Thanks in advance!