thats nice , change the first oil after 20 hours ,,,,,,,,,and if its already filled with oil from factory then replace it right now,,,,,,,,,,,,because factory fill them with gear oil and then test them,,,,,,,,,,mostelly they drain the oil before shiping but some times they forget,,,,,,,,,,,the one i buy was filled with gear oil,,,,,,,,,,,,,,you may need to replace the battery as well,,,,,,,,,,batter fit a new battery in your car and fit that old car battery in generator,,,,,,,,,,,it will last for atleast 3 years ,,,,,,,,,,,,,