It is a bad idea to leave gas in a lawn mower over winter due to the internal problems it can cause. Do not mix old, stale gasoline from winter with new gas in spring. Dispose of the old gas first.

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Yahoo: Can You Mix New Lawn Mower Gas with Old Gas Left Over from Last Season? Pros Weigh In Can You Mix New Lawn Mower Gas with Old Gas Left Over from Last Season? Pros Weigh In WRAL: Costly gas mix-up damages over 50 cars: How 5 On Your Side got them repairs for life Costly gas mix-up damages over 50 cars: How 5 On Your Side got them repairs for life Yahoo: Clinton Township Meijer mix-up has drivers putting diesel in their gas tanks More drivers are coming forward saying they got bad fuel at a Macomb County Meijer Express gas station, an issue the company has been working on for days after alerting drivers about a fuel mix-up. Clinton Township Meijer mix-up has drivers putting diesel in their gas tanks