No, no EPA rating as far as I know. It's just a natural gas fueled little 2 cylinder Kohler engine with a ridiculously LOUD muffler on it. You'd think I paid $ 14k for this 20K unit, ( after installation ), you'd think they could design a quieter exhaust system ?!?! The generator motor is quiet, not the Kohler engine turning it. The muffler looks like it came off a " run of the mill" tractor or backhoe, only smaller. No resonators, no CATS, no nothing. Installed in 2017, and the exhaust started rusting in 6 months. Had to spray the whole noisy system with 2,000 degree ceramic header paint. Ridiculous. Soooo, being that there are no 02 sensors or nothing, after reading a gazillion posts on which oil is better for the engine, in my climate, seems that 5W30 synthetic is the better choice to protect engine during a prolonged outage. That little S.O.B. does work hard during an outage. I have a 200amp house, but the machine only kicks out 100amp @ 20K. It struggles under load, ( especially the HVAC system when condenser kicks on for A/C ). Fortunately, only have an outage maybe 1X a year. It'll be fine for that. Most of the time it's just exercising 1X a week for 20minutes., no load.
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