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I can and do use synthetic oil in lawn mowers and other small engines. The newer design engines with overhead valves and overhead cams such as the Honda usually call for multi weight 10w-30 oil. In those engines just use the same weight oil as called for in the manual but in a synthetic such as Mobile-one. Engines like the flat-head Brigg's call for single weight 30w oil, in those old engines I use 20W-50 synthetic which is a good compromise.
Some say it is a waste of money to use synthetic, however the cost is minimal if you use 1/2 quart of $7 synthetic for a once a year oil change you are paying $3.50 for 1/2 quart. If you use regular non-synthetic oil your cost for 1/2 quart would be about $1.75. So your cost to use synthetic is $1.75 a year. If your lawn mower lasts 12 years with synthetic vs 6 years with regular oil then you have saved yourself $250(new mower cost) over 6 years or $41.66 a year toward the cost of a new mower. Commericial heavy users would probably save alot more money.
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Q: Can you use synthetic oil in a lawn mower?
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