If there is any oil that you could get(no questions asked, free)? What would it be and why? I would also like to hear opinions on Amsoil Series 3000 vs there 5/30, 10/30 formulas. Right now trying to decide between the Series 3000 or Redline. I've tried doing a oil analysis on the batch of German Castol but as of a month no kit!!!!! Thanx every1.