Quit fooling around...Put some 80W-90 gear oil in that bad boy!...May be even better to put some blackstrap molasses in there, instead...Right, beer guy!...Generator is direct from WEN, no shipping and no tax!
WEN GN400iM RV-Ready 4000-Watt Open Frame Inverter Generator
Generates clean power to safely operate sensitive electronics such as phones, tablets, TVs, and computers Parallel-ready panel allows you to connect any 2 WEN® inverter generators for increased wattage output 212cc 4-stroke engine produces 4,000 surge watts and 3,500 rated watts Lightweight body...wenproducts.com
For oil, it wants 30W oil. Once break-in is finished I'm going to fill it with 15W-40
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