I have found that only a very small quantity of oil is required to run the machine effectively without huge amounts of smoke at full throttle. The full tank only contains half a pint of fuel when full. use a plastic milk bottle top to measure out the oil. I assume you have a second hand petrol trimmer and can't get hold of the manual I can't either. but I have the benefit of owning a Generater with manual and oil quantity guide lines. If you can do better please get back to me pal.
B FEARNS, May 2008