If it has a 4 stroke engine, as most lawnmowers do, then you just car engine oil. Very occasionally you come across 2 stroke mowers.
The way to know if it's a 4 stroke or 2 stroke engine is, if it has an oil tank it's a 4 stroke engine. If there's only the one tank, i.e. you mix the oil with the petrol then it's a 2 stroke engine.
If it's a 2 stroke engine you mix petrol and 2 stroke oil at a ratio of 40:1
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