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Jan 19, 2010 · That temperature should really not change whether the engine is brand new or 10 years old, The manufactures put thermostates into their engines with specific operating temps because that is the temperature that they run best at and are at their most efficiant in terms of engine wear, fuel economy/efficiancy and emmisions.. Jul 24, 2019 · The Life Expectancy of the Marine Engine. The average marine gasoline engine runs for 1,500 hours before needing a major overhaul. The average marine diesel engine will run for more than three times that long and log an average 5,000 hours under the same conditions. The number of hours that a marine engine runs is very dependent on the amount ....