Hmmm ....Sears doesn't actually build lawn mowers or tractors or tools ...another company does ...so, question is what company built the garden tractor you have?
John Deere builds most of their equipment ...except the lower end models at HD, etc ...I think. Advantage to JD is they have a parts network they manage and support for their equipment. They do use other company parts ...for example, my GT275 garden tractor has a single cylinder Kawasaki engine. It's about 17 years old - have replaced blades and belts, one spark plug, and filters, and anti-scalp wheels on the mower deck, and change oil once a year - mows about two acres, once a week, 30 weeks a year. But, have not replaced any engine component, or bearing, or fuel component, or electronics.
It was much more expensive than Sears sold when new, but probably has been a reasonable cost vs quality trade.
On the ethanol issue ...when first introduced it posed only a threat to the fuel lines and o rings in direct contact with the fuel ...but, that was 20 years or so ago, right? Every engine manufacturer has been using ethanol resistant components for about as long. Never heard of ethanol causing blockage ...could be if very old fuel lines that it deteriorated front the inside?
On the buy or not the JD 300 ...depends on condition and hours ...don't know if the newer 300s are actually core JD products or if they farm them out.
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