what is expected engine life of 3.0L dohc engine in Mercury mariner? decent maintaenance
200,000 miles plus with proper maintenance. Read about the Duratec 30 engine at the link...http://www.tomorrowstechnician.com/engine-series-a-decade- of-the-duratec-30/
A car motor should last about 10 year, you can more from it, if you stay on top of all the maintenance and you change the oil every 3,000 to 5,000 miles.
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