too much oil? just blow out the crankcase vent. too little oil? burn up a bearing, not a piston ring. bad installation? unless it was so over enclosed that it badly overheated. I can't imagine anything there, and again the piston ring would not be the first thing to burn up. wrong fuel? unless you filled it full of gasoline, and then it would immediately shut off before anything mechanical could be damaged. so are they full of crap or just stupid?
hopefully they will get enough bad reputation from your experience to cost them far more in the long run than fixing your generator.
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