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What is the oil to petrol ratio for a 2 stroke Tondu garden Strimmer?

Tondu recommends a fuel mixture ratio of 25 parts unleaded petrol to one part 2-stroke air-cooled engine oil. That is roughly 40ml of oil per litre of petrol. Always use a good quality two-stroke oil that confirms to API standard TC. Use Unleaded petrol with an octane rating of at least 90. You can also use Aspen two-stroke petrol which has oil already mixed in.