I have a little cup that says 30ml equals 1 oz. there for I would put 120ml in a us gallon for 32 to 1. there are 128oz in a gal and that is 4.55 litres so 132ml would be 32 to 1 for break in or even 140 for the first 5 litre can. the US importer specifies chain saw oil. 166 seems rich but better than lean