John Deere – 2 blown engines in less than 50 hrs

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Bought a S170 from Lowes. Changed oil with EZ oil change and immediately tractor engine problems. John Deere changed engine that was ruined at 33.9 hrs. Got tractor back in time for winter. At 14hrs new engine, engine trouble again. Jasper John Deere reports ruined engine yet again. Total tractor hour time is 49hrs with 2 engines. John Deere states brand new (14hr) engine warrantied for 6 months (time it was stored for winter). So... 2 engines blown in less than 50 hrs. of light duty work. Not sure of resolution as yet. John Deere Corporate has been contacted and awaiting response. Just thought new buyers should be aware. (PS I take good care of equipment, still looks new)