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Amsoil makes a 5W-30 and 10W-30 small engine oil specifically designed for small 4-stroke power equipment including mowers. This is what the spec says for both: Use 5W-30 Synthetic Small-Engine Oil in small engines found in (not limited to) snowblowers, generators, power washers and other...

That is not quite correct. Compared to liquid-cooled automobile engines, small engines run hotter, operate under constant load, generate more oil-damaging contaminants, suffer from neglected maintenance, and are exposed to dirt, rain, and other extremes. Simply put, they are tougher on oil...

It doesn't have to be Toro's oil, but it SHOULD be an oil designed for small engines. Automobile oil has an additive package that DOES NOT contain zinc because of the cat converter damage that would occur if zinc were in the oil. Small engines need the protection of zinc due to the high...