begining with    unleaded fuel:

       if youre tractor had new valves since 1970  you will be fine  with unleaded gas.    We use to use the addative and had a lot of problems with  it settling out  and  plugging  lines and carburators with it.   Then I heard   JEFF BROOKS  a  mechanic on the radio  and he said when he was a kid  when a  50's era car was having problems.... as a mechanic  back then he said  he use to perscribe using    WHITE GAS---- AKA unleaded.
From that time on I have not worried one bit about  the  lead or the additive.

and the only problem  we have ever had with  Ethonal fuel was it cleaned out a fuel tank and plugged  some jets in  a carburator.    That wouldnt have happend if there had been a good  filter on the line.



now remember I am not a professional but  someone that has ran  this stuff  ===  since 1966    and these are just  my observations on more than one brand, more than one type of fuel,   but I admit  a  bias  FOR green fuels!