a good quality 2 stroke oil, such as esso 2t part synthetic or castrol, comma, 2 stroke oil e.t.c, i mix mine at a ratio of 25-1, which is 40 mil of oil to 1 litre of petrol, hope this helps you,if you have a user manual for your strimmer it might say a ratio of 50-1, which is 20mil of oil to 1 litre of petrol.....
rob
June 2006
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