Hi Kerry, If you look on the filler cap It will have either 40-1 or 50-1 ratio mixture which works out:-
40-1 4 litre of petrol to a 100 mils of oil
50-1 5 litre of petrol to a 100 mils of oil
you can buy 100 mil sachets which makes life easier
as for the line use the heaviest one
roy vaughan alexander, June 2009