Hi guys i am new hear and hopefully my baja should turn up today .I am sorry if this has been asked before but did a search and nothing came up.I have heard that for the first couple of tanks run it at 30:1 and after that switch to 25:1.Is that rite?And also how do i know how much oil to mix with 5 litres of petrol?Thanks for any advice and i am praying it turns up today.