What type of oil is generally recommended for use in lawn mowers?

Synthetic oil is generally recommended for use in lawn mowers due to its superior performance characteristics compared to other types of oils. Synthetic oil offers better lubrication at both high and low temperatures, which is essential for the varying conditions in which lawn mowers operate. It provides improved engine cleanliness by reducing sludge and deposits, ensuring the engine components remain in good condition. Additionally, synthetic oil has a longer lifespan than conventional oils, which can lead to less frequent oil changes and lower overall maintenance costs.

In contrast, vegetable oil is not suitable for lawn mowers as it can break down and cause engine issues. Mineral oil, while better than vegetable oil for engine applications, does not provide the same level of protection and efficiency as synthetic oil. Lastly, transmission fluid is specifically designed for use in vehicle transmissions and contains additives that may not be appropriate for a lawn mower engine, potentially leading to reduced performance or damage.